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OpenAI releases the GPT-5.6 model family: Sol, Terra and Luna

UpdateVerifiedAdded Sep 22, 2026

GPT-5.6 Sol, Terra and Luna span frontier to high-volume workloads, and gpt-5.6 routes to Sol. The family adds Programmatic Tool Calling, explicit prompt caching controls, persisted reasoning and Pro mode, with multi-agent orchestration in beta.

Read OpenAI's release notes

https://developers.openai.com/api/docs/changelog#jul-9

Summaries of vendors' own notes. Product names and logos belong to their owners; logos via logo.dev.

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