Nightly OSS: GPT5 Models | Tool choices other than 'auto' are not supported with model

NIGHTLY_CODEX_FINAL_ATTEMPT_1.md

@@ -0,0 +1,14 @@
+Implemented a small focused contribution for `openai/openai-python#2537`.
+
+Changed:
+- Added `test_streaming_allowed_tools_tool_choice_body` in [tests/lib/responses/test_responses.py](/home/runner/work/oss-nightly-control/oss-nightly-control/target/tests/lib/responses/test_responses.py)
+- Added required [NIGHTLY_REPORT.md](/home/runner/work/oss-nightly-control/oss-nightly-control/target/NIGHTLY_REPORT.md)
+
+Verified:
+- `uv run --with pytest --with pytest-asyncio --with respx --with inline-snapshot pytest tests/lib/responses/test_responses.py -q -o addopts=''` passed: `6 passed`
+- `uv run --with ruff ruff check tests/lib/responses/test_responses.py` passed
+- `uv run --with ruff ruff format --check tests/lib/responses/test_responses.py` passed
+
+Notes:
+- The original 400 appears server/model-policy driven, so I did not add SDK-side validation that could go stale. The test locks the SDK’s request serialization for the reported GPT-5 + streamed `allowed_tools` tool choice shape.
+- Existing untracked `.codex-nightly-prompt.md` and `uv.lock` were left untouched.

tests/lib/responses/test_responses.py

@@ -1,7 +1,9 @@
 from __future__ import annotations
 
+import json
 from typing_extensions import TypeVar
 
+import httpx
 import pytest
 from respx import MockRouter
 from inline_snapshot import snapshot
@@ -41,6 +43,53 @@ def test_output_text(client: OpenAI, respx_mock: MockRouter) -> None:
     )
 
 
+@pytest.mark.respx(base_url=base_url)
+def test_streaming_allowed_tools_tool_choice_body(client: OpenAI, respx_mock: MockRouter) -> None:
+    respx_mock.post("/responses").mock(return_value=httpx.Response(200, json={}))
+
+    response = client.responses.with_raw_response.create(
+        model="gpt-5",
+        input="Use your python tool to do this math: 8*9183*7663",
+        tools=[
+            {
+                "type": "code_interpreter",
+                "container": {"type": "auto"},
+            }
+        ],
+        tool_choice={
+            "type": "allowed_tools",
+            "mode": "auto",
+            "tools": [
+                {
+                    "type": "code_interpreter",
+                }
+            ],
+        },
+        stream=True,
+    )
+
+    assert json.loads(response.http_request.content) == {
+        "model": "gpt-5",
+        "input": "Use your python tool to do this math: 8*9183*7663",
+        "tools": [
+            {
+                "type": "code_interpreter",
+                "container": {"type": "auto"},
+            }
+        ],
+        "tool_choice": {
+            "type": "allowed_tools",
+            "mode": "auto",
+            "tools": [
+                {
+                    "type": "code_interpreter",
+                }
+            ],
+        },
+        "stream": True,
+    }
+
+
 @pytest.mark.parametrize("sync", [True, False], ids=["sync", "async"])
 def test_stream_method_definition_in_sync(sync: bool, client: OpenAI, async_client: AsyncOpenAI) -> None:
     checking_client: OpenAI | AsyncOpenAI = client if sync else async_client