Overview
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.
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 and model page list `gpt-6-luna`; the model targets high-volume tasks, is available through the Responses API, and supports OpenAI’s built-in tools.
MODEL NUMBER059
- 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 tier alongside Astra and Sol.
03
Architecture & capabilities
Model capabilities
CodingImage generationLong-horizon agent
Connected tools
Computer useWeb searchFile searchCode interpreter
API features
Adjustable reasoning
04
Release history
OpenAI’s official API catalog and model page list GPT-6 Luna as the efficient, high-volume tier, with a 1.05M context window, 128K output limit, and Responses API tool use.
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06
Sources
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