require base url if no api key

pydantic_ai_slim/pydantic_ai/models/openai.py

@@ -6,7 +6,7 @@
 from dataclasses import dataclass, field
 from datetime import datetime, timezone
 from itertools import chain
-from typing import Literal, Union, cast, get_args, overload
+from typing import Literal, Union, cast, overload
 
 from httpx import AsyncClient as AsyncHTTPClient
 from typing_extensions import assert_never
@@ -102,15 +102,9 @@ def __init__(
                 In the future, this may be inferred from the model name.
         """
         self.model_name: OpenAIModelName = model_name
-        # This is a workaround for the OpenAI client requiring an API key, but locally served,
-        # openai compatible models models not always needing an API key.
-        if (
-            api_key is None
-            and 'OPENAI_API_KEY' not in os.environ
-            and model_name not in get_args(ChatModel)
-            and openai_client is None
-        ):
-            assert base_url is not None, 'A base_url must be provided if not using an openai model'
+        # This is a workaround for the OpenAI client requiring an API key, whilst locally served,
+        # openai compatible models do not always need an API key.
+        if api_key is None and 'OPENAI_API_KEY' not in os.environ and base_url is not None:
             api_key = ''
         elif openai_client is not None:
             assert http_client is None, 'Cannot provide both `openai_client` and `http_client`'