Update Cerebras models and default

[rosetta-livekit-bot]

Summary

• Update the Cerebras public model catalog to gpt-oss-120b, zai-glm-4.7, and gemma-4-31b.
• Use gpt-oss-120b as the default for the dedicated Cerebras plugin and OpenAI-compatible adapter.
• Update the existing Cerebras integration tests and add patch changesets for the two changed packages.

Port of livekit/agents#6593.

Validation

• pnpm build passed for all 40 workspace packages.
• pnpm --filter @livekit/agents-plugin-openai build passed.
• pnpm --filter @livekit/agents-plugin-cerebras build passed after its OpenAI dependency was built.
• Built-artifact runtime smoke check verified both Cerebras defaults resolve to gpt-oss-120b.
• pnpm --filter @livekit/agents-plugin-cerebras lint passed.
• pnpm test plugins/openai ran 101 tests: 99 passed and 2 skipped; two unrelated suites fail during setup because the checkout has an invalid/missing Silero ONNX asset and tts.test.ts constructs the existing realtime STT without its newly required VAD.
• pnpm test plugins/cerebras is blocked at collection because CEREBRAS_API_KEY is unavailable in this environment.
• pnpm lint is blocked by pre-existing Prettier errors in plugins/baseten, plugins/phonic, and plugins/mistralai; the OpenAI package also has existing formatting errors outside this diff.

No target infrastructure gaps were found.

Source diff coverage

Source diff coverage

• Ported: livekit-plugins/livekit-plugins-cerebras/livekit/plugins/cerebras/models.py to plugins/cerebras/src/models.ts, replacing the model union with the same three-model catalog.
• Adapted: livekit-plugins/livekit-plugins-cerebras/livekit/plugins/cerebras/llm.py to plugins/cerebras/src/llm.ts, applying the same default through the TypeScript options object.
• Ported: livekit-plugins/livekit-plugins-openai/livekit/plugins/openai/models.py to plugins/openai/src/models.ts, mirroring the same model union.
• Adapted: livekit-plugins/livekit-plugins-openai/livekit/plugins/openai/llm.py to plugins/openai/src/llm.ts, applying the same default through the camelCase withCerebras adapter.
• Adapted: tests/test_plugin_cerebras.py to plugins/cerebras/src/llm.test.ts, updating the existing JS integration-test model constants and rationale so chat and tool calls both use gpt-oss-120b.
• Not applicable: none; every source file has a target counterpart.

---

Ported from livekit/agents#6593

Original PR description

Summary

• Adds zai-glm-4.7 and gemma-4-31b to both Cerebras model types and changes the dedicated plugin default to gpt-oss-120b.
• The current public catalog is gpt-oss-120b, zai-glm-4.7, and gemma-4-31b.

Why

The previous model ID was retired or the fixed catalog was missing a currently available Cerebras model. This could produce failed requests, stale autocomplete, or misleading examples.

Validation

• Python syntax parsing, git diff check, and comparison with the live Cerebras model endpoint.
• Source of truth: https://api.cerebras.ai/public/v1/models

[changeset-bot]

🦋 Changeset detected

Latest commit: 0bf37e9

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

This PR includes changesets to release 39 packages

Name	Type
@livekit/agents-plugin-cerebras	Patch
@livekit/agents-plugin-openai	Patch
@livekit/agents-plugin-anam	Patch
@livekit/agents-plugin-cartesia	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-krisp	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-azure	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-protoface	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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Click here if you're a maintainer who wants to add another changeset to this PR

[devin-ai-integration]

✅ Devin Review: No Issues Found

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

View in Devin Review to see 1 additional finding.