o3 was released by OpenAI on April 16, 2025, as a flagship model in the GPT line.
o3 fixes 69.1% of real software bugs on SWE-bench Verified versus 48.9% for o1 and makes 20% fewer major errors on hard real-world tasks in external expert reviews, at a launch price a third lower.
Compared with o1 · the model it replaces
Fixes 7 in 10 real software bugs
SWE-bench Verified — fixing real bugs in real software projects
69.1%
▲ up from 48.9% · +20.2 points
Costs a third less than o1 at launch
Price per 1M tokens — what developers pay, input / output
$10 / $40
▲ down from $15 / $60 · 33% cheaper
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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GPT-6.1 Sol 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.
Latest: GPT-6.1 Sol · Sep 29, 2026
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