gpt-5.6-luna

Update · Model: gpt-5.6-sol · Model: gpt-5.6-terra · Model: gpt-5.6-luna · API: v1/responses · API: v1/chat/completions

Starting July 30, GPT-5.6 Luna costs 80% less, while GPT-5.6 Terra costs 20% less. See pricing details.

We're also introducing Fast mode in the API, which replaces our Priority Processing offering. For GPT-5.6 Sol, Fast mode now delivers up to 2.5× faster speeds than standard processing at twice the price. This change is backward compatible: requests tagged priority will automatically use Fast mode.

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Feature · Model: gpt-5.6-sol · Model: gpt-5.6-terra · Model: gpt-5.6-luna · API: v1/responses · API: v1/chat/completions · API: v1/batch

Released the GPT-5.6 model family, including GPT-5.6 Sol for frontier capability, GPT-5.6 Terra for a balance of intelligence and cost, and GPT-5.6 Luna for efficient, high-volume workloads. The gpt-5.6 alias routes requests to gpt-5.6-sol.

GPT-5.6 adds Programmatic Tool Calling, explicit prompt caching controls, persisted reasoning, max reasoning effort, and Pro mode, and Multi-agent orchestration in beta for the Responses API. GPT-5.6 also accepts images at their original dimensions with original or auto image detail.

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