diff --git a/.changeset/selfish-snakes-drive.md b/.changeset/selfish-snakes-drive.md
new file mode 100644
index 000000000..6229acbb3
--- /dev/null
+++ b/.changeset/selfish-snakes-drive.md
@@ -0,0 +1,5 @@
+---
+"@assistant-ui/react": patch
+---
+
+feat: MessageRuntime.unstable_getCopyText API
diff --git a/packages/react/src/runtimes/speech/SpeechAdapterTypes.ts b/packages/react/src/runtimes/speech/SpeechAdapterTypes.ts
index 93c01e487..5f8492541 100644
--- a/packages/react/src/runtimes/speech/SpeechAdapterTypes.ts
+++ b/packages/react/src/runtimes/speech/SpeechAdapterTypes.ts
@@ -1,4 +1,4 @@
-import { ThreadMessage, Unsubscribe } from "../../types";
+import { Unsubscribe } from "../../types";
 
 export namespace SpeechSynthesisAdapter {
   export type Status =
@@ -19,7 +19,7 @@ export namespace SpeechSynthesisAdapter {
 }
 
 export type SpeechSynthesisAdapter = {
-  speak: (message: ThreadMessage) => SpeechSynthesisAdapter.Utterance;
+  speak: (text: string) => SpeechSynthesisAdapter.Utterance;
 };
 
 export namespace SpeechRecognitionAdapter {
diff --git a/packages/react/src/runtimes/speech/WebSpeechSynthesisAdapter.ts b/packages/react/src/runtimes/speech/WebSpeechSynthesisAdapter.ts
index e6fb9870c..065660f6e 100644
--- a/packages/react/src/runtimes/speech/WebSpeechSynthesisAdapter.ts
+++ b/packages/react/src/runtimes/speech/WebSpeechSynthesisAdapter.ts
@@ -1,10 +1,7 @@
-import { ThreadMessage } from "../../types";
-import { getThreadMessageText } from "../../utils/getThreadMessageText";
 import { SpeechSynthesisAdapter } from "./SpeechAdapterTypes";
 
 export class WebSpeechSynthesisAdapter implements SpeechSynthesisAdapter {
-  speak(message: ThreadMessage): SpeechSynthesisAdapter.Utterance {
-    const text = getThreadMessageText(message);
+  speak(text: string): SpeechSynthesisAdapter.Utterance {
     const utterance = new SpeechSynthesisUtterance(text);
 
     const subscribers = new Set<() => void>();