Release dates
— OpenAI released GPT-6 Sol and GPT-6 Luna for complex work and high-volume tasks, with text/image input, 1.05M context and 128K output, available through the API, ChatGPT Work and Codex. ↗
GPT-6 Luna
The efficiency-focused GPT-6 tier for high-volume coding, reasoning, and tool tasks, also with a 1.05M context window and 128K output limit.
OpenAI’s official API catalog still lists `gpt-6-luna`. The October 7 system card explicitly distinguishes the October and September versions; the September version remains in ChatGPT Work and Codex, while main ChatGPT uses the October version. Official docs do not map the fixed API ID `gpt-6-luna` to either ChatGPT version or identify it as the October model.
MODEL NUMBER075
- First public date
- 2026-09-22
- Organization
- OpenAI
- Family
- GPT
01
Specifications
Only published specifications are shown.
02
Overview
Why it mattered
Luna extends the GPT-6 line to high-volume workloads, forming a clear current API, Codex, and Work tier alongside Astra and Sol.
03
Architecture & capabilities
Model capabilities
CodingLong-horizon agent
Connected tools
Computer useWeb searchFile searchImage generationCode interpreter
API features
Adjustable reasoning
04
Release history
OpenAI released GPT-6 Sol and GPT-6 Luna for complex work and high-volume tasks, with text/image input, 1.05M context and 128K output, available through the API, ChatGPT Work and Codex.
View source05
Related models
Select a card to view the related model.
06
Sources
01
OpenAI API modelsOpenAI · Checked 2026-09-22
Official · Verified02GPT-6 Luna ModelOpenAI · Checked 2026-09-22
Official · Verified03Introducing GPT-6 Sol and LunaOpenAI · Published 2026-09-22 · Checked 2026-09-23
Official · Verified04OpenAI API and ChatGPT model catalogOpenAI · Checked 2026-10-07
Official · Verified05GPT-6 Sol and GPT-6 Luna: October 2026 updateOpenAI · Published 2026-10-07 · Checked 2026-10-07
Official · Verified06GPT-6 Sol ModelOpenAI · Checked 2026-09-22
Official · VerifiedSuggest a correction
Copy this template, add the field, proposed value, and primary source, and share it with the archive maintainer.