OpenAI’s October GPT-6 Luna version released in ChatGPT on 2026-10-07, distinct from the September version still used in Work/Codex; official docs do not map it to a fixed API ID or separately publish a complete I/O specification.
OpenAI announced the ChatGPT rollout for GPT-6 Luna on 2026-10-07; Free and Go begin using it on 2026-10-08, while Enterprise availability depends on admin settings. The official system card distinguishes this from September Luna, which remains in ChatGPT Work and Codex. No separate fixed API ID is published for the October version.
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— OpenAI introduced the October ChatGPT versions of GPT-6 Sol and Luna. Its system card distinguishes them from the September versions still used in ChatGPT Work/Codex; the new versions add Intelligent UI and updated safety training, with Sol available to paid plans from October 7 and Luna to Free/Go from October 8. ↗
The October version introduces Intelligent UI: GPT-6 can combine text, visuals, and interactive components, and begin answering while it thinks or uses tools; OpenAI also updated safety training.
OpenAI introduced the October ChatGPT versions of GPT-6 Sol and Luna. Its system card distinguishes them from the September versions still used in ChatGPT Work/Codex; the new versions add Intelligent UI and updated safety training, with Sol available to paid plans from October 7 and Luna to Free/Go from October 8.
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