GPT-5.6 Luna (ChatGPT, August 2026)
OpenAI · 2026-08-06
OpenAI's August 6, 2026 GPT-5.6 Luna release for everyday conversations in ChatGPT, distinct from the July Luna artifact retained in Codex and ChatGPT Work. The original system card identifies the August checkpoint separately; its native deployment reasoning setting, exact API identifier, context limit and knowledge cutoff are undisclosed.