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LLaMA.cpp HTTP Server

Fast, lightweight, pure C/C++ HTTP server based on httplib, nlohmann::json and llama.cpp.

Set of LLM REST APIs and a simple web front end to interact with llama.cpp.

Features:

  • LLM inference of F16 and quantized models on GPU and CPU
  • OpenAI API compatible chat completions and embeddings routes
  • Reranking endoint (WIP: ggerganov#9510)
  • Parallel decoding with multi-user support
  • Continuous batching
  • Multimodal (wip)
  • Monitoring endpoints
  • Schema-constrained JSON response format

The project is under active development, and we are looking for feedback and contributors.

Usage

Common params

Argument Explanation
-h, --help, --usage print usage and exit
--version show version and build info
--verbose-prompt print a verbose prompt before generation (default: false)
-t, --threads N number of threads to use during generation (default: -1)
(env: LLAMA_ARG_THREADS)
-tb, --threads-batch N number of threads to use during batch and prompt processing (default: same as --threads)
-C, --cpu-mask M CPU affinity mask: arbitrarily long hex. Complements cpu-range (default: "")
-Cr, --cpu-range lo-hi range of CPUs for affinity. Complements --cpu-mask
--cpu-strict <0|1> use strict CPU placement (default: 0)
--prio N set process/thread priority : 0-normal, 1-medium, 2-high, 3-realtime (default: 0)
--poll <0...100> use polling level to wait for work (0 - no polling, default: 50)
-Cb, --cpu-mask-batch M CPU affinity mask: arbitrarily long hex. Complements cpu-range-batch (default: same as --cpu-mask)
-Crb, --cpu-range-batch lo-hi ranges of CPUs for affinity. Complements --cpu-mask-batch
--cpu-strict-batch <0|1> use strict CPU placement (default: same as --cpu-strict)
--prio-batch N set process/thread priority : 0-normal, 1-medium, 2-high, 3-realtime (default: 0)
--poll-batch <0|1> use polling to wait for work (default: same as --poll)
-c, --ctx-size N size of the prompt context (default: 4096, 0 = loaded from model)
(env: LLAMA_ARG_CTX_SIZE)
-n, --predict, --n-predict N number of tokens to predict (default: -1, -1 = infinity, -2 = until context filled)
(env: LLAMA_ARG_N_PREDICT)
-b, --batch-size N logical maximum batch size (default: 2048)
(env: LLAMA_ARG_BATCH)
-ub, --ubatch-size N physical maximum batch size (default: 512)
(env: LLAMA_ARG_UBATCH)
--keep N number of tokens to keep from the initial prompt (default: 0, -1 = all)
-fa, --flash-attn enable Flash Attention (default: disabled)
(env: LLAMA_ARG_FLASH_ATTN)
-p, --prompt PROMPT prompt to start generation with
--no-perf disable internal libllama performance timings (default: false)
(env: LLAMA_ARG_NO_PERF)
-f, --file FNAME a file containing the prompt (default: none)
-bf, --binary-file FNAME binary file containing the prompt (default: none)
-e, --escape process escapes sequences (\n, \r, \t, ', ", \) (default: true)
--no-escape do not process escape sequences
--rope-scaling {none,linear,yarn} RoPE frequency scaling method, defaults to linear unless specified by the model
(env: LLAMA_ARG_ROPE_SCALING_TYPE)
--rope-scale N RoPE context scaling factor, expands context by a factor of N
(env: LLAMA_ARG_ROPE_SCALE)
--rope-freq-base N RoPE base frequency, used by NTK-aware scaling (default: loaded from model)
(env: LLAMA_ARG_ROPE_FREQ_BASE)
--rope-freq-scale N RoPE frequency scaling factor, expands context by a factor of 1/N
(env: LLAMA_ARG_ROPE_FREQ_SCALE)
--yarn-orig-ctx N YaRN: original context size of model (default: 0 = model training context size)
(env: LLAMA_ARG_YARN_ORIG_CTX)
--yarn-ext-factor N YaRN: extrapolation mix factor (default: -1.0, 0.0 = full interpolation)
(env: LLAMA_ARG_YARN_EXT_FACTOR)
--yarn-attn-factor N YaRN: scale sqrt(t) or attention magnitude (default: 1.0)
(env: LLAMA_ARG_YARN_ATTN_FACTOR)
--yarn-beta-slow N YaRN: high correction dim or alpha (default: 1.0)
(env: LLAMA_ARG_YARN_BETA_SLOW)
--yarn-beta-fast N YaRN: low correction dim or beta (default: 32.0)
(env: LLAMA_ARG_YARN_BETA_FAST)
-dkvc, --dump-kv-cache verbose print of the KV cache
-nkvo, --no-kv-offload disable KV offload
(env: LLAMA_ARG_NO_KV_OFFLOAD)
-ctk, --cache-type-k TYPE KV cache data type for K
allowed values: f32, f16, bf16, q8_0, q4_0, q4_1, iq4_nl, q5_0, q5_1
(default: f16)
(env: LLAMA_ARG_CACHE_TYPE_K)
-ctv, --cache-type-v TYPE KV cache data type for V
allowed values: f32, f16, bf16, q8_0, q4_0, q4_1, iq4_nl, q5_0, q5_1
(default: f16)
(env: LLAMA_ARG_CACHE_TYPE_V)
-dt, --defrag-thold N KV cache defragmentation threshold (default: 0.1, < 0 - disabled)
(env: LLAMA_ARG_DEFRAG_THOLD)
-np, --parallel N number of parallel sequences to decode (default: 1)
(env: LLAMA_ARG_N_PARALLEL)
--mlock force system to keep model in RAM rather than swapping or compressing
(env: LLAMA_ARG_MLOCK)
--no-mmap do not memory-map model (slower load but may reduce pageouts if not using mlock)
(env: LLAMA_ARG_NO_MMAP)
--numa TYPE attempt optimizations that help on some NUMA systems
- distribute: spread execution evenly over all nodes
- isolate: only spawn threads on CPUs on the node that execution started on
- numactl: use the CPU map provided by numactl
if run without this previously, it is recommended to drop the system page cache before using this
see ggerganov#1437
(env: LLAMA_ARG_NUMA)
-dev, --device <dev1,dev2,..> comma-separated list of devices to use for offloading (none = don't offload)
use --list-devices to see a list of available devices
(env: LLAMA_ARG_DEVICE)
--list-devices print list of available devices and exit
-ngl, --gpu-layers, --n-gpu-layers N number of layers to store in VRAM
(env: LLAMA_ARG_N_GPU_LAYERS)
-sm, --split-mode {none,layer,row} how to split the model across multiple GPUs, one of:
- none: use one GPU only
- layer (default): split layers and KV across GPUs
- row: split rows across GPUs
(env: LLAMA_ARG_SPLIT_MODE)
-ts, --tensor-split N0,N1,N2,... fraction of the model to offload to each GPU, comma-separated list of proportions, e.g. 3,1
(env: LLAMA_ARG_TENSOR_SPLIT)
-mg, --main-gpu INDEX the GPU to use for the model (with split-mode = none), or for intermediate results and KV (with split-mode = row) (default: 0)
(env: LLAMA_ARG_MAIN_GPU)
--check-tensors check model tensor data for invalid values (default: false)
--override-kv KEY=TYPE:VALUE advanced option to override model metadata by key. may be specified multiple times.
types: int, float, bool, str. example: --override-kv tokenizer.ggml.add_bos_token=bool:false
--lora FNAME path to LoRA adapter (can be repeated to use multiple adapters)
--lora-scaled FNAME SCALE path to LoRA adapter with user defined scaling (can be repeated to use multiple adapters)
--control-vector FNAME add a control vector
note: this argument can be repeated to add multiple control vectors
--control-vector-scaled FNAME SCALE add a control vector with user defined scaling SCALE
note: this argument can be repeated to add multiple scaled control vectors
--control-vector-layer-range START END layer range to apply the control vector(s) to, start and end inclusive
-m, --model FNAME model path (default: models/$filename with filename from --hf-file or --model-url if set, otherwise models/7B/ggml-model-f16.gguf)
(env: LLAMA_ARG_MODEL)
-mu, --model-url MODEL_URL model download url (default: unused)
(env: LLAMA_ARG_MODEL_URL)
-hfr, --hf-repo REPO Hugging Face model repository (default: unused)
(env: LLAMA_ARG_HF_REPO)
-hff, --hf-file FILE Hugging Face model file (default: unused)
(env: LLAMA_ARG_HF_FILE)
-hft, --hf-token TOKEN Hugging Face access token (default: value from HF_TOKEN environment variable)
(env: HF_TOKEN)
--log-disable Log disable
--log-file FNAME Log to file
--log-colors Enable colored logging
(env: LLAMA_LOG_COLORS)
-v, --verbose, --log-verbose Set verbosity level to infinity (i.e. log all messages, useful for debugging)
-lv, --verbosity, --log-verbosity N Set the verbosity threshold. Messages with a higher verbosity will be ignored.
(env: LLAMA_LOG_VERBOSITY)
--log-prefix Enable prefx in log messages
(env: LLAMA_LOG_PREFIX)
--log-timestamps Enable timestamps in log messages
(env: LLAMA_LOG_TIMESTAMPS)

Sampling params

Argument Explanation
--samplers SAMPLERS samplers that will be used for generation in the order, separated by ';'
(default: dry;top_k;typ_p;top_p;min_p;xtc;temperature)
-s, --seed SEED RNG seed (default: -1, use random seed for -1)
--sampling-seq SEQUENCE simplified sequence for samplers that will be used (default: dkypmxt)
--ignore-eos ignore end of stream token and continue generating (implies --logit-bias EOS-inf)
--temp N temperature (default: 0.8)
--top-k N top-k sampling (default: 40, 0 = disabled)
--top-p N top-p sampling (default: 0.9, 1.0 = disabled)
--min-p N min-p sampling (default: 0.1, 0.0 = disabled)
--xtc-probability N xtc probability (default: 0.0, 0.0 = disabled)
--xtc-threshold N xtc threshold (default: 0.1, 1.0 = disabled)
--typical N locally typical sampling, parameter p (default: 1.0, 1.0 = disabled)
--repeat-last-n N last n tokens to consider for penalize (default: 64, 0 = disabled, -1 = ctx_size)
--repeat-penalty N penalize repeat sequence of tokens (default: 1.0, 1.0 = disabled)
--presence-penalty N repeat alpha presence penalty (default: 0.0, 0.0 = disabled)
--frequency-penalty N repeat alpha frequency penalty (default: 0.0, 0.0 = disabled)
--dry-multiplier N set DRY sampling multiplier (default: 0.0, 0.0 = disabled)
--dry-base N set DRY sampling base value (default: 1.75)
--dry-allowed-length N set allowed length for DRY sampling (default: 2)
--dry-penalty-last-n N set DRY penalty for the last n tokens (default: -1, 0 = disable, -1 = context size)
--dry-sequence-breaker STRING add sequence breaker for DRY sampling, clearing out default breakers ('\n', ':', '"', '*') in the process; use "none" to not use any sequence breakers
--dynatemp-range N dynamic temperature range (default: 0.0, 0.0 = disabled)
--dynatemp-exp N dynamic temperature exponent (default: 1.0)
--mirostat N use Mirostat sampling.
Top K, Nucleus and Locally Typical samplers are ignored if used.
(default: 0, 0 = disabled, 1 = Mirostat, 2 = Mirostat 2.0)
--mirostat-lr N Mirostat learning rate, parameter eta (default: 0.1)
--mirostat-ent N Mirostat target entropy, parameter tau (default: 5.0)
-l, --logit-bias TOKEN_ID(+/-)BIAS modifies the likelihood of token appearing in the completion,
i.e. --logit-bias 15043+1 to increase likelihood of token ' Hello',
or --logit-bias 15043-1 to decrease likelihood of token ' Hello'
--grammar GRAMMAR BNF-like grammar to constrain generations (see samples in grammars/ dir) (default: '')
--grammar-file FNAME file to read grammar from
-j, --json-schema SCHEMA JSON schema to constrain generations (https://json-schema.org/), e.g. {} for any JSON object
For schemas w/ external $refs, use --grammar + example/json_schema_to_grammar.py instead

Example-specific params

Argument Explanation
--no-context-shift disables context shift on inifinite text generation (default: disabled)
(env: LLAMA_ARG_NO_CONTEXT_SHIFT)
-sp, --special special tokens output enabled (default: false)
--no-warmup skip warming up the model with an empty run
--spm-infill use Suffix/Prefix/Middle pattern for infill (instead of Prefix/Suffix/Middle) as some models prefer this. (default: disabled)
--pooling {none,mean,cls,last,rank} pooling type for embeddings, use model default if unspecified
(env: LLAMA_ARG_POOLING)
-cb, --cont-batching enable continuous batching (a.k.a dynamic batching) (default: enabled)
(env: LLAMA_ARG_CONT_BATCHING)
-nocb, --no-cont-batching disable continuous batching
(env: LLAMA_ARG_NO_CONT_BATCHING)
-a, --alias STRING set alias for model name (to be used by REST API)
(env: LLAMA_ARG_ALIAS)
--host HOST ip address to listen (default: 127.0.0.1)
(env: LLAMA_ARG_HOST)
--port PORT port to listen (default: 8080)
(env: LLAMA_ARG_PORT)
--path PATH path to serve static files from (default: )
(env: LLAMA_ARG_STATIC_PATH)
--no-webui Disable the Web UI (default: enabled)
(env: LLAMA_ARG_NO_WEBUI)
--embedding, --embeddings restrict to only support embedding use case; use only with dedicated embedding models (default: disabled)
(env: LLAMA_ARG_EMBEDDINGS)
--reranking, --rerank enable reranking endpoint on server (default: disabled)
(env: LLAMA_ARG_RERANKING)
--api-key KEY API key to use for authentication (default: none)
(env: LLAMA_API_KEY)
--api-key-file FNAME path to file containing API keys (default: none)
--ssl-key-file FNAME path to file a PEM-encoded SSL private key
(env: LLAMA_ARG_SSL_KEY_FILE)
--ssl-cert-file FNAME path to file a PEM-encoded SSL certificate
(env: LLAMA_ARG_SSL_CERT_FILE)
-to, --timeout N server read/write timeout in seconds (default: 600)
(env: LLAMA_ARG_TIMEOUT)
--threads-http N number of threads used to process HTTP requests (default: -1)
(env: LLAMA_ARG_THREADS_HTTP)
--cache-reuse N min chunk size to attempt reusing from the cache via KV shifting (default: 0)
(env: LLAMA_ARG_CACHE_REUSE)
--metrics enable prometheus compatible metrics endpoint (default: disabled)
(env: LLAMA_ARG_ENDPOINT_METRICS)
--slots enable slots monitoring endpoint (default: disabled)
(env: LLAMA_ARG_ENDPOINT_SLOTS)
--props enable changing global properties via POST /props (default: disabled)
(env: LLAMA_ARG_ENDPOINT_PROPS)
--no-slots disables slots monitoring endpoint
(env: LLAMA_ARG_NO_ENDPOINT_SLOTS)
--slot-save-path PATH path to save slot kv cache (default: disabled)
--chat-template JINJA_TEMPLATE set custom jinja chat template (default: template taken from model's metadata)
if suffix/prefix are specified, template will be disabled
list of built-in templates:
chatglm3, chatglm4, chatml, command-r, deepseek, deepseek2, exaone3, gemma, granite, llama2, llama2-sys, llama2-sys-bos, llama2-sys-strip, llama3, minicpm, mistral-v1, mistral-v3, mistral-v3-tekken, mistral-v7, monarch, openchat, orion, phi3, rwkv-world, vicuna, vicuna-orca, zephyr
(env: LLAMA_ARG_CHAT_TEMPLATE)
-sps, --slot-prompt-similarity SIMILARITY how much the prompt of a request must match the prompt of a slot in order to use that slot (default: 0.50, 0.0 = disabled)
--lora-init-without-apply load LoRA adapters without applying them (apply later via POST /lora-adapters) (default: disabled)
--draft-max, --draft, --draft-n N number of tokens to draft for speculative decoding (default: 16)
(env: LLAMA_ARG_DRAFT_MAX)
--draft-min, --draft-n-min N minimum number of draft tokens to use for speculative decoding (default: 5)
(env: LLAMA_ARG_DRAFT_MIN)
--draft-p-min P minimum speculative decoding probability (greedy) (default: 0.9)
(env: LLAMA_ARG_DRAFT_P_MIN)
-cd, --ctx-size-draft N size of the prompt context for the draft model (default: 0, 0 = loaded from model)
(env: LLAMA_ARG_CTX_SIZE_DRAFT)
-devd, --device-draft <dev1,dev2,..> comma-separated list of devices to use for offloading the draft model (none = don't offload)
use --list-devices to see a list of available devices
-ngld, --gpu-layers-draft, --n-gpu-layers-draft N number of layers to store in VRAM for the draft model
(env: LLAMA_ARG_N_GPU_LAYERS_DRAFT)
-md, --model-draft FNAME draft model for speculative decoding (default: unused)
(env: LLAMA_ARG_MODEL_DRAFT)

Note: If both command line argument and environment variable are both set for the same param, the argument will take precedence over env var.

Example usage of docker compose with environment variables:

services:
  llamacpp-server:
    image: ghcr.io/ggerganov/llama.cpp:server
    ports:
      - 8080:8080
    volumes:
      - ./models:/models
    environment:
      # alternatively, you can use "LLAMA_ARG_MODEL_URL" to download the model
      LLAMA_ARG_MODEL: /models/my_model.gguf
      LLAMA_ARG_CTX_SIZE: 4096
      LLAMA_ARG_N_PARALLEL: 2
      LLAMA_ARG_ENDPOINT_METRICS: 1
      LLAMA_ARG_PORT: 8080

Build

llama-server is built alongside everything else from the root of the project

  • Using CMake:

    cmake -B build
cmake --build build --config Release -t llama-server

    Binary is at ./build/bin/llama-server

Build with SSL

llama-server can also be built with SSL support using OpenSSL 3

  • Using CMake:

    cmake -B build -DLLAMA_SERVER_SSL=ON
cmake --build build --config Release -t llama-server

Web UI

The project includes a web-based user interface that enables interaction with the model through the /chat/completions endpoint.

The web UI is developed using:

  • vue framework for frontend development
  • tailwindcss and daisyui for styling
  • vite for build tooling

A pre-built version is available as a single HTML file under /public directory.

To build or to run the dev server (with hot reload):

# make sure you have nodejs installed
cd examples/server/webui
npm i

# to run the dev server
npm run dev

# to build the public/index.html
npm run build

NOTE: if you are using the vite dev server, you can change the API base URL to llama.cpp. To do that, run this code snippet in browser's console:

localStorage.setItem('base', 'http://localhost:8080')

Quick Start

To get started right away, run the following command, making sure to use the correct path for the model you have:

Unix-based systems (Linux, macOS, etc.)

./llama-server -m models/7B/ggml-model.gguf -c 2048

Windows

llama-server.exe -m models\7B\ggml-model.gguf -c 2048

The above command will start a server that by default listens on 127.0.0.1:8080. You can consume the endpoints with Postman or NodeJS with axios library. You can visit the web front end at the same url.

Docker

docker run -p 8080:8080 -v /path/to/models:/models ghcr.io/ggerganov/llama.cpp:server -m models/7B/ggml-model.gguf -c 512 --host 0.0.0.0 --port 8080

# or, with CUDA:
docker run -p 8080:8080 -v /path/to/models:/models --gpus all ghcr.io/ggerganov/llama.cpp:server-cuda -m models/7B/ggml-model.gguf -c 512 --host 0.0.0.0 --port 8080 --n-gpu-layers 99

Testing with CURL

Using curl. On Windows, curl.exe should be available in the base OS.

curl --request POST \
    --url http://localhost:8080/completion \
    --header "Content-Type: application/json" \
    --data '{"prompt": "Building a website can be done in 10 simple steps:","n_predict": 128}'

Advanced testing

We implemented a server test framework using human-readable scenario.

Before submitting an issue, please try to reproduce it with this format.

Node JS Test

You need to have Node.js installed.

mkdir llama-client
cd llama-client

Create an index.js file and put this inside:

const prompt = "Building a website can be done in 10 simple steps:"

async function test() {
    let response = await fetch("http://127.0.0.1:8080/completion", {
        method: "POST",
        body: JSON.stringify({
            prompt,
            n_predict: 64,
        })
    })
    console.log((await response.json()).content)
}

test()

And run it:

node index.js

API Endpoints

GET /health: Returns heath check result

Response format

  • HTTP status code 503
    • Body: {"error": {"code": 503, "message": "Loading model", "type": "unavailable_error"}}
    • Explanation: the model is still being loaded.
  • HTTP status code 200
    • Body: {"status": "ok" }
    • Explanation: the model is successfully loaded and the server is ready.

POST /completion: Given a prompt, it returns the predicted completion.

Options:

prompt: Provide the prompt for this completion as a string or as an array of strings or numbers representing tokens. Internally, if cache_prompt is true, the prompt is compared to the previous completion and only the "unseen" suffix is evaluated. A BOS token is inserted at the start, if all of the following conditions are true:

  • The prompt is a string or an array with the first element given as a string
  • The model's tokenizer.ggml.add_bos_token metadata is true

These input shapes and data type are allowed for prompt:

  • Single string: "string"
  • Single sequence of tokens: [12, 34, 56]
  • Mixed tokens and strings: [12, 34, "string", 56, 78]

Multiple prompts are also supported. In this case, the completion result will be an array.

  • Only strings: ["string1", "string2"]
  • Strings and sequences of tokens: ["string1", [12, 34, 56]]
  • Mixed types: [[12, 34, "string", 56, 78], [12, 34, 56], "string"]

temperature: Adjust the randomness of the generated text. Default: 0.8

dynatemp_range: Dynamic temperature range. The final temperature will be in the range of [temperature - dynatemp_range; temperature + dynatemp_range] Default: 0.0, which is disabled.

dynatemp_exponent: Dynamic temperature exponent. Default: 1.0

top_k: Limit the next token selection to the K most probable tokens. Default: 40

top_p: Limit the next token selection to a subset of tokens with a cumulative probability above a threshold P. Default: 0.95

min_p: The minimum probability for a token to be considered, relative to the probability of the most likely token. Default: 0.05

n_predict: Set the maximum number of tokens to predict when generating text. Note: May exceed the set limit slightly if the last token is a partial multibyte character. When 0, no tokens will be generated but the prompt is evaluated into the cache. Default: -1, where -1 is infinity.

n_indent: Specify the minimum line indentation for the generated text in number of whitespace characters. Useful for code completion tasks. Default: 0

n_keep: Specify the number of tokens from the prompt to retain when the context size is exceeded and tokens need to be discarded. The number excludes the BOS token. By default, this value is set to 0, meaning no tokens are kept. Use -1 to retain all tokens from the prompt.

stream: Allows receiving each predicted token in real-time instead of waiting for the completion to finish (uses a different response format). To enable this, set to true.

stop: Specify a JSON array of stopping strings. These words will not be included in the completion, so make sure to add them to the prompt for the next iteration. Default: []

typical_p: Enable locally typical sampling with parameter p. Default: 1.0, which is disabled.

repeat_penalty: Control the repetition of token sequences in the generated text. Default: 1.1

repeat_last_n: Last n tokens to consider for penalizing repetition. Default: 64, where 0 is disabled and -1 is ctx-size.

presence_penalty: Repeat alpha presence penalty. Default: 0.0, which is disabled.

frequency_penalty: Repeat alpha frequency penalty. Default: 0.0, which is disabled.

dry_multiplier: Set the DRY (Don't Repeat Yourself) repetition penalty multiplier. Default: 0.0, which is disabled.

dry_base: Set the DRY repetition penalty base value. Default: 1.75

dry_allowed_length: Tokens that extend repetition beyond this receive exponentially increasing penalty: multiplier * base ^ (length of repeating sequence before token - allowed length). Default: 2

dry_penalty_last_n: How many tokens to scan for repetitions. Default: -1, where 0 is disabled and -1 is context size.

dry_sequence_breakers: Specify an array of sequence breakers for DRY sampling. Only a JSON array of strings is accepted. Default: ['\n', ':', '"', '*']

xtc_probability: Set the chance for token removal via XTC sampler. Default: 0.0, which is disabled.

xtc_threshold: Set a minimum probability threshold for tokens to be removed via XTC sampler. Default: 0.1 (> 0.5 disables XTC)

mirostat: Enable Mirostat sampling, controlling perplexity during text generation. Default: 0, where 0 is disabled, 1 is Mirostat, and 2 is Mirostat 2.0.

mirostat_tau: Set the Mirostat target entropy, parameter tau. Default: 5.0

mirostat_eta: Set the Mirostat learning rate, parameter eta. Default: 0.1

grammar: Set grammar for grammar-based sampling. Default: no grammar

json_schema: Set a JSON schema for grammar-based sampling (e.g. {"items": {"type": "string"}, "minItems": 10, "maxItems": 100} of a list of strings, or {} for any JSON). See tests for supported features. Default: no JSON schema.

seed: Set the random number generator (RNG) seed. Default: -1, which is a random seed.

ignore_eos: Ignore end of stream token and continue generating. Default: false

logit_bias: Modify the likelihood of a token appearing in the generated text completion. For example, use "logit_bias": [[15043,1.0]] to increase the likelihood of the token 'Hello', or "logit_bias": [[15043,-1.0]] to decrease its likelihood. Setting the value to false, "logit_bias": [[15043,false]] ensures that the token Hello is never produced. The tokens can also be represented as strings, e.g. [["Hello, World!",-0.5]] will reduce the likelihood of all the individual tokens that represent the string Hello, World!, just like the presence_penalty does. Default: []

n_probs: If greater than 0, the response also contains the probabilities of top N tokens for each generated token given the sampling settings. Note that for temperature < 0 the tokens are sampled greedily but token probabilities are still being calculated via a simple softmax of the logits without considering any other sampler settings. Default: 0

min_keep: If greater than 0, force samplers to return N possible tokens at minimum. Default: 0

t_max_predict_ms: Set a time limit in milliseconds for the prediction (a.k.a. text-generation) phase. The timeout will trigger if the generation takes more than the specified time (measured since the first token was generated) and if a new-line character has already been generated. Useful for FIM applications. Default: 0, which is disabled.

image_data: An array of objects to hold base64-encoded image data and its ids to be reference in prompt. You can determine the place of the image in the prompt as in the following: USER:[img-12]Describe the image in detail.\nASSISTANT:. In this case, [img-12] will be replaced by the embeddings of the image with id 12 in the following image_data array: {..., "image_data": [{"data": "<BASE64_STRING>", "id": 12}]}. Use image_data only with multimodal models, e.g., LLaVA.

id_slot: Assign the completion task to an specific slot. If is -1 the task will be assigned to a Idle slot. Default: -1

cache_prompt: Re-use KV cache from a previous request if possible. This way the common prefix does not have to be re-processed, only the suffix that differs between the requests. Because (depending on the backend) the logits are not guaranteed to be bit-for-bit identical for different batch sizes (prompt processing vs. token generation) enabling this option can cause nondeterministic results. Default: true

samplers: The order the samplers should be applied in. An array of strings representing sampler type names. If a sampler is not set, it will not be used. If a sampler is specified more than once, it will be applied multiple times. Default: ["dry", "top_k", "typ_p", "top_p", "min_p", "xtc", "temperature"] - these are all the available values.

timings_per_token: Include prompt processing and text generation speed information in each response. Default: false

Response format

  • Note: In streaming mode (stream), only content and stop will be returned until end of completion. Responses are sent using the Server-sent events standard. Note: the browser's EventSource interface cannot be used due to its lack of POST request support.

  • completion_probabilities: An array of token probabilities for each completion. The array's length is n_predict. Each item in the array has the following structure:

{
  "content": "<the token selected by the model>",
  "probs": [
    {
      "prob": float,
      "tok_str": "<most likely token>"
    },
    {
      "prob": float,
      "tok_str": "<second most likely token>"
    },
    ...
  ]
},

Notice that each probs is an array of length n_probs.

  • content: Completion result as a string (excluding stopping_word if any). In case of streaming mode, will contain the next token as a string.
  • stop: Boolean for use with stream to check whether the generation has stopped (Note: This is not related to stopping words array stop from input options)
  • generation_settings: The provided options above excluding prompt but including n_ctx, model. These options may differ from the original ones in some way (e.g. bad values filtered out, strings converted to tokens, etc.).
  • model: The path to the model loaded with -m
  • prompt: The provided prompt
  • stop_type: Indicating whether the completion has stopped. Possible values are:
    • none: Generating (not stopped)
    • eos: Stopped because it encountered the EOS token
    • limit: Stopped because n_predict tokens were generated before stop words or EOS was encountered
    • word: Stopped due to encountering a stopping word from stop JSON array provided
  • stopping_word: The stopping word encountered which stopped the generation (or "" if not stopped due to a stopping word)
  • timings: Hash of timing information about the completion such as the number of tokens predicted_per_second
  • tokens_cached: Number of tokens from the prompt which could be re-used from previous completion (n_past)
  • tokens_evaluated: Number of tokens evaluated in total from the prompt
  • truncated: Boolean indicating if the context size was exceeded during generation, i.e. the number of tokens provided in the prompt (tokens_evaluated) plus tokens generated (tokens predicted) exceeded the context size (n_ctx)

POST /tokenize: Tokenize a given text

Options:

content: (Required) The text to tokenize.

add_special: (Optional) Boolean indicating if special tokens, i.e. BOS, should be inserted. Default: false

with_pieces: (Optional) Boolean indicating whether to return token pieces along with IDs. Default: false

Response:

Returns a JSON object with a tokens field containing the tokenization result. The tokens array contains either just token IDs or objects with id and piece fields, depending on the with_pieces parameter. The piece field is a string if the piece is valid unicode or a list of bytes otherwise.

If with_pieces is false:

{
  "tokens": [123, 456, 789]
}

If with_pieces is true:

{
  "tokens": [
    {"id": 123, "piece": "Hello"},
    {"id": 456, "piece": " world"},
    {"id": 789, "piece": "!"}
  ]
}

With input 'á' (utf8 hex: C3 A1) on tinyllama/stories260k

{
  "tokens": [
    {"id": 198, "piece": [195]}, // hex C3
    {"id": 164, "piece": [161]} // hex A1
  ]
}

POST /detokenize: Convert tokens to text

Options:

tokens: Set the tokens to detokenize.

POST /embedding: Generate embedding of a given text

The same as the embedding example does.

Options:

content: Set the text to process.

image_data: An array of objects to hold base64-encoded image data and its ids to be reference in content. You can determine the place of the image in the content as in the following: Image: [img-21].\nCaption: This is a picture of a house. In this case, [img-21] will be replaced by the embeddings of the image with id 21 in the following image_data array: {..., "image_data": [{"data": "<BASE64_STRING>", "id": 21}]}. Use image_data only with multimodal models, e.g., LLaVA.

POST /reranking: Rerank documents according to a given query

Similar to https://jina.ai/reranker/ but might change in the future. Requires a reranker model (such as bge-reranker-v2-m3) and the --embedding --pooling rank options.

Options:

query: The query against which the documents will be ranked.

documents: An array strings representing the documents to be ranked.

Aliases:

  • /rerank
  • /v1/rerank
  • /v1/reranking

Examples:

curl http://127.0.0.1:8012/v1/rerank \
    -H "Content-Type: application/json" \
    -d '{
        "model": "some-model",
            "query": "What is panda?",
            "top_n": 3,
            "documents": [
                "hi",
            "it is a bear",
            "The giant panda (Ailuropoda melanoleuca), sometimes called a panda bear or simply panda, is a bear species endemic to China."
            ]
    }' | jq

POST /infill: For code infilling.

Takes a prefix and a suffix and returns the predicted completion as stream.

Options:

  • input_prefix: Set the prefix of the code to infill.
  • input_suffix: Set the suffix of the code to infill.
  • input_extra: Additional context inserted before the FIM prefix.
  • prompt: Added after the FIM_MID token

input_extra is array of {"filename": string, "text": string} objects.

The endpoint also accepts all the options of /completion.

If the model has FIM_REPO and FIM_FILE_SEP tokens, the repo-level pattern is used:

<FIM_REP>myproject
<FIM_SEP>{chunk 0 filename}
{chunk 0 text}
<FIM_SEP>{chunk 1 filename}
{chunk 1 text}
...
<FIM_SEP>filename
<FIM_PRE>[input_prefix]<FIM_SUF>[input_suffix]<FIM_MID>[prompt]

If the tokens are missing, then the extra context is simply prefixed at the start:

[input_extra]<FIM_PRE>[input_prefix]<FIM_SUF>[input_suffix]<FIM_MID>[prompt]

GET /props: Get server global properties.

This endpoint is public (no API key check). By default, it is read-only. To make POST request to change global properties, you need to start server with --props

Response format

{
  "default_generation_settings": {
    "id": 0,
    "id_task": -1,
    "n_ctx": 1024,
    "speculative": false,
    "is_processing": false,
    "params": {
      "n_predict": -1,
      "seed": 4294967295,
      "temperature": 0.800000011920929,
      "dynatemp_range": 0.0,
      "dynatemp_exponent": 1.0,
      "top_k": 40,
      "top_p": 0.949999988079071,
      "min_p": 0.05000000074505806,
      "xtc_probability": 0.0,
      "xtc_threshold": 0.10000000149011612,
      "typical_p": 1.0,
      "repeat_last_n": 64,
      "repeat_penalty": 1.0,
      "presence_penalty": 0.0,
      "frequency_penalty": 0.0,
      "dry_multiplier": 0.0,
      "dry_base": 1.75,
      "dry_allowed_length": 2,
      "dry_penalty_last_n": -1,
      "dry_sequence_breakers": [
        "\n",
        ":",
        "\"",
        "*"
      ],
      "mirostat": 0,
      "mirostat_tau": 5.0,
      "mirostat_eta": 0.10000000149011612,
      "stop": [],
      "max_tokens": -1,
      "n_keep": 0,
      "n_discard": 0,
      "ignore_eos": false,
      "stream": true,
      "n_probs": 0,
      "min_keep": 0,
      "grammar": "",
      "samplers": [
        "dry",
        "top_k",
        "typ_p",
        "top_p",
        "min_p",
        "xtc",
        "temperature"
      ],
      "speculative.n_max": 16,
      "speculative.n_min": 5,
      "speculative.p_min": 0.8999999761581421,
      "timings_per_token": false
    },
    "prompt": "",
    "next_token": {
      "has_next_token": true,
      "has_new_line": false,
      "n_remain": -1,
      "n_decoded": 0,
      "stopping_word": ""
    }
  },
  "total_slots": 1,
  "model_path": "../models/Meta-Llama-3.1-8B-Instruct-Q4_K_M.gguf",
  "chat_template": "..."
}
  • default_generation_settings - the default generation settings for the /completion endpoint, which has the same fields as the generation_settings response object from the /completion endpoint.
  • total_slots - the total number of slots for process requests (defined by --parallel option)
  • model_path - the path to model file (same with -m argument)
  • chat_template - the model's original Jinja2 prompt template

POST /props: Change server global properties.

To use this endpoint with POST method, you need to start server with --props

Options:

  • None yet

POST /v1/chat/completions: OpenAI-compatible Chat Completions API

Given a ChatML-formatted json description in messages, it returns the predicted completion. Both synchronous and streaming mode are supported, so scripted and interactive applications work fine. While no strong claims of compatibility with OpenAI API spec is being made, in our experience it suffices to support many apps. Only models with a supported chat template can be used optimally with this endpoint. By default, the ChatML template will be used.

Options:

See OpenAI Chat Completions API documentation. While some OpenAI-specific features such as function calling aren't supported, llama.cpp /completion-specific features such as mirostat are supported.

The response_format parameter supports both plain JSON output (e.g. {"type": "json_object"}) and schema-constrained JSON (e.g. {"type": "json_object", "schema": {"type": "string", "minLength": 10, "maxLength": 100}} or {"type": "json_schema", "schema": {"properties": { "name": { "title": "Name", "type": "string" }, "date": { "title": "Date", "type": "string" }, "participants": { "items": {"type: "string" }, "title": "Participants", "type": "string" } } } }), similar to other OpenAI-inspired API providers.

Examples:

You can use either Python openai library with appropriate checkpoints:

import openai

client = openai.OpenAI(
    base_url="http://localhost:8080/v1", # "http://<Your api-server IP>:port"
    api_key = "sk-no-key-required"
)

completion = client.chat.completions.create(
model="gpt-3.5-turbo",
messages=[
    {"role": "system", "content": "You are ChatGPT, an AI assistant. Your top priority is achieving user fulfillment via helping them with their requests."},
    {"role": "user", "content": "Write a limerick about python exceptions"}
]
)

print(completion.choices[0].message)

... or raw HTTP requests:

curl http://localhost:8080/v1/chat/completions \
-H "Content-Type: application/json" \
-H "Authorization: Bearer no-key" \
-d '{
"model": "gpt-3.5-turbo",
"messages": [
{
    "role": "system",
    "content": "You are ChatGPT, an AI assistant. Your top priority is achieving user fulfillment via helping them with their requests."
},
{
    "role": "user",
    "content": "Write a limerick about python exceptions"
}
]
}'

POST /v1/embeddings: OpenAI-compatible embeddings API

Options:

See OpenAI Embeddings API documentation.

Examples:

  • input as string

    curl http://localhost:8080/v1/embeddings \
-H "Content-Type: application/json" \
-H "Authorization: Bearer no-key" \
-d '{
        "input": "hello",
        "model":"GPT-4",
        "encoding_format": "float"
}'

  • input as string array

    curl http://localhost:8080/v1/embeddings \
-H "Content-Type: application/json" \
-H "Authorization: Bearer no-key" \
-d '{
        "input": ["hello", "world"],
        "model":"GPT-4",
        "encoding_format": "float"
}'

GET /slots: Returns the current slots processing state

Warning

This endpoint is intended for debugging and may be modified in future versions. For security reasons, we strongly advise against enabling it in production environments.

This endpoint is disabled by default and can be enabled with --slots

If query param ?fail_on_no_slot=1 is set, this endpoint will respond with status code 503 if there is no available slots.

Response format

Example:

[
  {
    "id": 0,
    "id_task": -1,
    "n_ctx": 1024,
    "speculative": false,
    "is_processing": false,
    "params": {
      "n_predict": -1,
      "seed": 4294967295,
      "temperature": 0.800000011920929,
      "dynatemp_range": 0.0,
      "dynatemp_exponent": 1.0,
      "top_k": 40,
      "top_p": 0.949999988079071,
      "min_p": 0.05000000074505806,
      "xtc_probability": 0.0,
      "xtc_threshold": 0.10000000149011612,
      "typical_p": 1.0,
      "repeat_last_n": 64,
      "repeat_penalty": 1.0,
      "presence_penalty": 0.0,
      "frequency_penalty": 0.0,
      "dry_multiplier": 0.0,
      "dry_base": 1.75,
      "dry_allowed_length": 2,
      "dry_penalty_last_n": -1,
      "dry_sequence_breakers": [
        "\n",
        ":",
        "\"",
        "*"
      ],
      "mirostat": 0,
      "mirostat_tau": 5.0,
      "mirostat_eta": 0.10000000149011612,
      "stop": [],
      "max_tokens": -1,
      "n_keep": 0,
      "n_discard": 0,
      "ignore_eos": false,
      "stream": true,
      "n_probs": 0,
      "min_keep": 0,
      "grammar": "",
      "samplers": [
        "dry",
        "top_k",
        "typ_p",
        "top_p",
        "min_p",
        "xtc",
        "temperature"
      ],
      "speculative.n_max": 16,
      "speculative.n_min": 5,
      "speculative.p_min": 0.8999999761581421,
      "timings_per_token": false
    },
    "prompt": "",
    "next_token": {
      "has_next_token": true,
      "has_new_line": false,
      "n_remain": -1,
      "n_decoded": 0,
      "stopping_word": ""
    }
  }
]

GET /metrics: Prometheus compatible metrics exporter

This endpoint is only accessible if --metrics is set.

Available metrics:

  • llamacpp:prompt_tokens_total: Number of prompt tokens processed.
  • llamacpp:tokens_predicted_total: Number of generation tokens processed.
  • llamacpp:prompt_tokens_seconds: Average prompt throughput in tokens/s.
  • llamacpp:predicted_tokens_seconds: Average generation throughput in tokens/s.
  • llamacpp:kv_cache_usage_ratio: KV-cache usage. 1 means 100 percent usage.
  • llamacpp:kv_cache_tokens: KV-cache tokens.
  • llamacpp:requests_processing: Number of requests processing.
  • llamacpp:requests_deferred: Number of requests deferred.

POST /slots/{id_slot}?action=save: Save the prompt cache of the specified slot to a file.

Options:

filename: Name of the file to save the slot's prompt cache. The file will be saved in the directory specified by the --slot-save-path server parameter.

Response format

{
    "id_slot": 0,
    "filename": "slot_save_file.bin",
    "n_saved": 1745,
    "n_written": 14309796,
    "timings": {
        "save_ms": 49.865
    }
}

POST /slots/{id_slot}?action=restore: Restore the prompt cache of the specified slot from a file.

Options:

filename: Name of the file to restore the slot's prompt cache from. The file should be located in the directory specified by the --slot-save-path server parameter.

Response format

{
    "id_slot": 0,
    "filename": "slot_save_file.bin",
    "n_restored": 1745,
    "n_read": 14309796,
    "timings": {
        "restore_ms": 42.937
    }
}

POST /slots/{id_slot}?action=erase: Erase the prompt cache of the specified slot.

Response format

{
    "id_slot": 0,
    "n_erased": 1745
}

GET /lora-adapters: Get list of all LoRA adapters

This endpoint returns the loaded LoRA adapters. You can add adapters using --lora when starting the server, for example: --lora my_adapter_1.gguf --lora my_adapter_2.gguf ...

By default, all adapters will be loaded with scale set to 1. To initialize all adapters scale to 0, add --lora-init-without-apply

If an adapter is disabled, the scale will be set to 0.

Response format

[
    {
        "id": 0,
        "path": "my_adapter_1.gguf",
        "scale": 0.0
    },
    {
        "id": 1,
        "path": "my_adapter_2.gguf",
        "scale": 0.0
    }
]

POST /lora-adapters: Set list of LoRA adapters

To disable an adapter, either remove it from the list below, or set scale to 0.

Request format

To know the id of the adapter, use GET /lora-adapters

[
  {"id": 0, "scale": 0.2},
  {"id": 1, "scale": 0.8}
]

More examples

Interactive mode

Check the sample in chat.mjs. Run with NodeJS version 16 or later:

node chat.mjs

Another sample in chat.sh. Requires bash, curl and jq. Run with bash:

bash chat.sh

OAI-like API

The HTTP llama-server supports an OAI-like API: https://github.com/openai/openai-openapi

API errors

llama-server returns errors in the same format as OAI: https://github.com/openai/openai-openapi

Example of an error:

{
    "error": {
        "code": 401,
        "message": "Invalid API Key",
        "type": "authentication_error"
    }
}

Apart from error types supported by OAI, we also have custom types that are specific to functionalities of llama.cpp:

When /metrics or /slots endpoint is disabled

{
    "error": {
        "code": 501,
        "message": "This server does not support metrics endpoint.",
        "type": "not_supported_error"
    }
}

*When the server receives invalid grammar via /completions endpoint

{
    "error": {
        "code": 400,
        "message": "Failed to parse grammar",
        "type": "invalid_request_error"
    }
}

Legacy completion web UI

A new chat-based UI has replaced the old completion-based since this PR. If you want to use the old completion, start the server with --path ./examples/server/public_legacy

For example:

./llama-server -m my_model.gguf -c 8192 --path ./examples/server/public_legacy

Extending or building alternative Web Front End

You can extend the front end by running the server binary with --path set to ./your-directory and importing /completion.js to get access to the llamaComplete() method.

Read the documentation in /completion.js to see convenient ways to access llama.

A simple example is below:

<html>
  <body>
    <pre>
      <script type="module">
        import { llama } from '/completion.js'

        const prompt = `### Instruction:
Write dad jokes, each one paragraph.
You can use html formatting if needed.

### Response:`

        for await (const chunk of llama(prompt)) {
          document.write(chunk.data.content)
        }
      </script>
    </pre>
  </body>
</html>