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OpenAI introduces GPT-5.6 Sol
Sol, Terra and Luna extend agentic work across a new model generation.
Model labOpenAI
OpenAIRelease date26 Jun 2026
OpenAI began a limited partner preview of GPT-5.6 Sol on June 26, describing improvements in coding and other extended tasks. OpenAI
On July 9, OpenAI began general rollout of the GPT-5.6 family in ChatGPT, Codex and the API. Sol is the flagship, with Terra and Luna offered as other tiers. OpenAI
Sources & attribution
- Organizational disclosure 26 Jun 2026OpenAI introduces the GPT-5.6 family
OpenAI. Original developer announcement.
- Organizational disclosure 9 Jul 2026Introducing GPT-5.6
OpenAI. Original developer announcement.