OpenAI · GPT-6 · Rolling out

GPT-6 Luna

GPT-6 Luna is OpenAI's most efficient GPT-6 model, for focused, high-volume tasks such as summarization, extraction and focused coding. It started rolling out on September 22, 2026 and costs $0.10 / $0.50 per 1M input/output tokens on the API, with a 1.05M-token context window.

· today
ChatGPT on aistack.sh
API price per 1M tokens
$0.10 in / $0.50 out
Context window
1.05M tokens

GPT-6 Luna specs

ReleasedSep 22, 2026
StatusRolling out
API model IDgpt-6-luna
API price (in / out)$0.10 / $0.50 per 1M tokens
Cache read$0.01 per 1M tokens
Context window1.05M tokens
PlansPlus, Pro, Business, Enterprise, Edu, Free and Go (desktop app)
PlatformsOpenAI API

Where you can use GPT-6 Luna

ChatGPT

In ChatGPT Work on the web and the desktop app; Free and Go users get it in the desktop app.

Codex
Codex

In the Codex CLI, IDE extension and Codex cloud. The rate-limit switch prompt recommends it.

  • API prices shown are OpenAI's short-context rates; long-context requests are billed higher.

GPT-6 Luna FAQ

How much does GPT-6 Luna cost on the API?

$0.10 per 1M input tokens, $0.01 per 1M cached input tokens and $0.50 per 1M output tokens at OpenAI's short-context rates.

Can free ChatGPT users use GPT-6 Luna?

Yes, in the desktop app. OpenAI's changelog says Free and Go users can access Luna there; Plus, Pro, Business, Enterprise and Edu get it in Codex and ChatGPT Work.

What is GPT-6 Luna for?

OpenAI describes it as its most efficient model for focused, high-volume tasks, including summarization, extraction and focused coding.

Other OpenAI models

GPT-6 Sol
Sep 22, 2026 · Rolling out
GPT-6 Astra
Available

Sources