GPT-6 Luna
by OpenAI · ID gpt-6-luna · Released 2026-09 · Proprietary
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ELO Score
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MMLU
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HumanEval
1.05M
Context Window
$0.10
Input Price
About GPT-6 Luna
The cheap, high-volume tier of the GPT-6 family, released 22 September 2026 at $0.10/$0.50, half the input and 58% below the output price of GPT-5.6 Luna, and permanent rather than promotional. Cached input $0.01 per million. 1.05M-token context, 128K output, knowledge cutoff 18 May 2026. Scores 66.6% on DeepSWE 1.1, and OpenAI says that at higher effort it matches GPT-5.6 Sol's factual reliability at roughly one hundredth of the task cost. Reaches Free and Go users in the ChatGPT desktop app. Not yet listed on the Arena text leaderboard as of 13 September 2026. Prices checked 23 September 2026.
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