Implement OpenAI Responses support

examples/samples/openai_responses.py

@@ -0,0 +1,29 @@
+"""OpenAI Responses API — stream text from GPT-5.5."""
+
+import asyncio
+import sys
+
+import ai
+
+if ai.openai.client().api_key is None:
+    print(f"[SKIP] {ai.openai.api_key_env} not set")
+    sys.exit(0)
+
+model = ai.openai("gpt-5.5")
+
+messages = [
+    ai.system_message("Be concise."),
+    ai.user_message("Explain what the OpenAI Responses API is in two sentences."),
+]
+
+
+async def main() -> None:
+    async with ai.stream(model, messages) as stream:
+        async for event in stream:
+            if isinstance(event, ai.events.TextDelta):
+                print(event.chunk, end="", flush=True)
+    print()
+
+
+if __name__ == "__main__":
+    asyncio.run(main())

src/ai/models/core/adapters.py

@@ -33,10 +33,12 @@ def _ensure_adapters() -> None:
     from ..ai_gateway.adapter import stream as ai_gw_stream
     from ..anthropic.adapter import stream as anthropic_stream
     from ..openai.adapter import stream as openai_stream
+    from ..openai.chat_adapter import stream as openai_chat_stream
 
     _stream_adapters["ai-gateway-v3"] = ai_gw_stream
     _generate_adapters["ai-gateway-v3"] = ai_gw_generate
     _stream_adapters["openai"] = openai_stream
+    _stream_adapters["openai.chat"] = openai_chat_stream
     _stream_adapters["anthropic"] = anthropic_stream
 
 

src/ai/models/openai/__init__.py

@@ -4,7 +4,8 @@
 
     from ai.models import openai
 
-    model = openai("gpt-5.4")
+    model = openai("gpt-5.4")        # Responses API
+    chat_model = openai.chat("gpt-4o")  # Chat Completions API
     ids = await openai.list()
 
 The adapter module is loaded lazily to avoid pulling in the ``openai``