The newest GPT Luna model is GPT-6 Luna, released on September 22, 2026. Until GPT-5.4 nano (March 2026), OpenAI called this tier “nano”. It shipped 32 days ago, and the line's usual gap is about 115 days.
How long it has been since the last release against the line's usual gap and its recent ones — the rhythm, not a date.
Latest: GPT-6 Luna · Sep 22, 2026
Every Monday, only when something shipped: the AI models that came out, what each one changed, and which lines are due next.
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Newest first — what each version changed versus the one before, in OpenAI's own numbers.
Half the input price and 58% less on output than GPT-5.6 Luna, with a 1-point higher all-round score.
Compared with GPT-5.6 Luna · the model it replaces
Solves two in three hard coding tasks
DeepSWE 1.1 — fixing real bugs in real software projects
66.6%
✦ no GPT-5.6 Luna score published to compare
Scores 1 point higher on the all-round intelligence index
Artificial Analysis Intelligence Index v4.3.2 — one score averaging 10 hard tests
38
▲ up from 37 · +1 point · both at max effort
Costs about half as much as the model it replaces
Price per 1M tokens — what developers pay, input / output
$0.10 / $0.50
▲ down from $0.20 / $1.20 · output 58% cheaper