GPT-6 Luna (ChatGPT, October 29, 2026)
OpenAI · 2026-10-29
OpenAI's October 29, 2026 update to GPT-6 Luna in ChatGPT, which OpenAI says gives more concise responses and reduces overly agreeable language. Its system card addendum calls it GPT-6 Luna (October 29) and evaluates it separately from GPT-6 Luna (October 7); the exact API identifier, maximum context and knowledge cutoff are not disclosed.