developer Message Role (gpt-oss-120b) The Chat Completions API now supports the developer message role for...

UpdateMar 26, 2026UnverifiedAdded Sep 24, 2026

developer Message Role (gpt-oss-120b) The Chat Completions API now supports the developer message role for gpt-oss-120b, aligning with the OpenAI API message format. The developer role is functionally equivalent to system , the system role remains supported for backwards compatibility. Other models do not support the developer role.

Topics: Developer tools

Cerebras's release notes

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Every Cerebras Inference release

Date	Release	Type
Mar 26	Temperature Parameter: Increased Maximum The maximum allowed value for the temperature parameter for Chat...unverified Update	Update
Mar 27	Rolling out selective 4-bit weight-only quantization for supported models, targeting non-sensitive layers...unverified Update	Update
Mar 25	Logprob Consistency Logprobs are now computed from the model's raw output, before applying temperature scalingunverified Update	Update
Mar 24	Deprecating disable_reasoning parameter for zai-glm-4.7 The disable_reasoning parameter is deprecated and...unverified Deprecation	Deprecation
Mar 30	Streaming: Server-Sent Events (SSE) Streaming responses for Chat Completions (/v1/chat/completions) and...unverified Update	Update
Mar 31	New Sampling Parameters The following parameters are now available on all models: - frequency_penalty –...unverified Update	Update
Apr 10	Payload Optimization: msgpack and gzip /v1/chat/completions and /v1/completions now accept request bodies...unverified Update	Update
Apr 22	New parameter: prompt_cache_key /v1/chat/completions and /v1/completions now accept an optional...unverified Update	Update

Also shipped on Mar 26, 2026

Cerebras in March 2026

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Sources: each vendor's own release notes, changelogs and GitHub releases, read daily to monthly by how often it posts. Logos via logo.dev; trademarks belong to their owners.

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Also shipped on Mar 26, 2026

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