GPT-6 Luna

OpenAI · Released Sep 22, 2026

$0.1

Input price / MTok

$0.5

Output price / MTok

1.1M

Context window

Summary

GPT-6 Luna is a proprietary language model from OpenAI, released on Sep 22, 2026.

At $0.1 input and $0.5 output per million tokens, it ranks #4 of 40 for input price, placing it among the most affordable options.

Its context window of 1.1M tokens ranks #7 of 41 for context depth in this dataset.

It targets budget workloads.

Released Sep 22 2026 alongside GPT-6 Sol as the high-volume, lowest-cost GPT-6 tier. Replaces GPT-5.6 Luna ($0.20/$1.20) at half the input price. API identifier gpt-6-luna, knowledge cutoff May 18 2026. Release date per OpenAI's developer community announcement (https://community.openai.com/t/announcing-gpt-6-sol-and-gpt-6-luna-in-the-api-codex-and-chatgpt/1399925).

No independently verified benchmark scores are available for this model. Scores are only shown when independently confirmed with a source URL.

Technical specs

OpenAI