Home › Archive › GPT Luna line GPT-4.1 nano was released by OpenAI on April 14, 2025, as a lightweight model in the GPT Luna line.
Release 1 of 5 in the GPT Luna line . The first release in this line. Replaced by GPT-5 nano on August 7, 2025, 115 days later. These days the line ships a new model about every 115 days. No detailed card for this model: we only add numbers published by the maker or by independent benchmarks. Sources: OpenAI
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GPT-6 Luna is the current model in this line. The card shows how long it has been since the last release against the line's usual gap and its recent ones — the rhythm, not a date.
OpenAI · GPT Luna line · lightweight
Just released released 12 days ago — usual gap is ~115
Half the input price and 58% less on output than GPT-5.6 Luna, with a 1-point higher all-round score.
Released Sep 22, 2026 · what changed → Days since last release
Days since last release
GPT-6 Luna · Sep 22, 2026
Recent gaps
Recent gaps
GPT-6 Luna · Sep 2026