1050000
context tokens
Undisclosed
parameters
Proprietary
license
Sep 2026
released
OpenAI released GPT-6 Luna on September 22, 2026, as the budget sibling to GPT-6 Sol. It shares Sol’s 1.05 million token context window and 128,000 token output limit but costs far less to run, at $0.10 per million input tokens and $0.50 per million output tokens, making it OpenAI’s pick for high-volume tasks like classification, summarization, and routine chat where the heavier reasoning of GPT-6 Astra or Sol isn’t needed.
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