GPT-6 Luna

Name: GPT-6 Luna
Brand: OpenAI

Generally Available

Overview

GPT-6 Luna is OpenAI's most efficient GPT-6 model for focused, high-volume tasks, with a 1,050,000-token context window, 128,000 max output tokens and a May 18, 2026 knowledge cutoff. Standard API text pricing is $0.10 per million input tokens and $0.50 per million output tokens.

Available September 22, 2026 via the API as gpt-6-luna, in ChatGPT Work and Codex for paid plans, and rolling to Free and Go users in the desktop app.