fix(openai): include model in gateway websocket urls

[rosetta-livekit-bot]

Summary

• Port Python fix for OpenAI Responses WebSocket URL routing to the JS OpenAI plugin.
• Include model on Responses WebSocket upgrade URLs for non-OpenAI gateway hosts only.
• Preserve native OpenAI behavior by omitting model from api.openai.com WebSocket URLs.
• Accept source-style full /responses base URLs without appending /responses twice.

Source diff coverage

Coverage classification

• livekit-plugins/livekit-plugins-openai/livekit/plugins/openai/responses/llm.py: adapted to plugins/openai/src/ws/llm.ts. The JS target splits Responses HTTP wrapper (responses/llm.ts) from Responses WebSocket implementation (ws/llm.ts), so the URL construction belongs in ws/llm.ts; parity is implemented by omitting model for native api.openai.com and adding it for gateway hosts, while preserving HTTP-to-WS scheme conversion. The target also keeps JS baseURL root semantics and now accepts source-style full /responses URLs without duplication.
• livekit-plugins/livekit-plugins-openai/livekit/plugins/openai/stt.py: ported to plugins/openai/src/stt.ts. The target already had the equivalent buildRealtimeSttUrl behavior: intent=transcription always, model only for non-native OpenAI hosts, and HTTP-to-WS scheme conversion, so no code change was needed.
• tests/test_plugin_openai_websocket_urls.py: adapted to plugins/openai/src/stt.test.ts and plugins/openai/src/ws/llm.test.ts. The target co-locates Vitest tests with each module and exposes URL builder helpers, so the source’s private fake-session URL assertions map to helper-level URL assertions rather than a new cross-plugin test file. Existing STT URL tests already covered the STT source cases; Responses WS tests were updated/extended for native omission, gateway inclusion, scheme conversion, and full /responses endpoint handling.

Verification

• pnpm build
• pnpm --filter @livekit/agents-plugin-openai lint (passes with pre-existing warnings)
• env -u OPENAI_API_KEY pnpm test -- plugins/openai
• cue-cli runtime validation against a temporary uncommitted JS worker using openai.responses.LLM({ useWebSocket: true }): assistant conversation_item_added framework events resolved for greeting and a user turn.

Note: pnpm test -- plugins/openai with the ambient OPENAI_API_KEY set entered optional provider integration tests and failed on existing environment/test prerequisites (plugins/silero/dist/silero_vad.onnx parse failure and an existing realtime STT-without-VAD construction in tts.test.ts). The suite passes when provider integrations follow their built-in skip path with OPENAI_API_KEY unset.

---

Ported from livekit/agents#6403

Original PR description

Summary

• include the selected model in realtime STT WebSocket upgrade URLs
• include the selected model in Responses API WebSocket upgrade URLs while preserving existing query parameters
• add hermetic regression tests for both upgrade paths

Test plan

• uv run pytest tests/test_plugin_openai_websocket_urls.py --unit
• uv run ruff check livekit-plugins/livekit-plugins-openai/livekit/plugins/openai/stt.py livekit-plugins/livekit-plugins-openai/livekit/plugins/openai/responses/llm.py tests/test_plugin_openai_websocket_urls.py
• uv run ruff format --check livekit-plugins/livekit-plugins-openai/livekit/plugins/openai/stt.py livekit-plugins/livekit-plugins-openai/livekit/plugins/openai/responses/llm.py tests/test_plugin_openai_websocket_urls.py
• make type-check

[changeset-bot]

🦋 Changeset detected

Latest commit: e8533fa

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 36 packages

Name	Type
@livekit/agents-plugin-openai	Patch
@livekit/agents-plugin-anam	Patch
@livekit/agents-plugin-cartesia	Patch
@livekit/agents-plugin-cerebras	Patch
@livekit/agents-plugin-elevenlabs	Patch
@livekit/agents-plugin-fishaudio	Patch
@livekit/agents-plugin-google	Patch
@livekit/agents-plugin-hume	Patch
@livekit/agents-plugin-inworld	Patch
@livekit/agents-plugin-neuphonic	Patch
@livekit/agents-plugin-perplexity	Patch
@livekit/agents-plugin-rime	Patch
@livekit/agents-plugin-sarvam	Patch
@livekit/agents-plugin-xai	Patch
@livekit/agents	Patch
@livekit/agents-plugin-anthropic	Patch
@livekit/agents-plugin-assemblyai	Patch
@livekit/agents-plugin-baseten	Patch
@livekit/agents-plugin-bey	Patch
@livekit/agents-plugin-deepgram	Patch
@livekit/agents-plugin-did	Patch
@livekit/agents-plugin-hedra	Patch
@livekit/agents-plugin-lemonslice	Patch
@livekit/agents-plugin-liveavatar	Patch
@livekit/agents-plugin-livekit	Patch
@livekit/agents-plugin-minimax	Patch
@livekit/agents-plugin-mistral	Patch
@livekit/agents-plugin-mistralai	Patch
@livekit/agents-plugin-phonic	Patch
@livekit/agents-plugin-resemble	Patch
@livekit/agents-plugin-runway	Patch
@livekit/agents-plugin-silero	Patch
@livekit/agents-plugin-soniox	Patch
@livekit/agents-plugin-tavus	Patch
@livekit/agents-plugin-trugen	Patch
@livekit/agents-plugins-test	Patch

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.