o1 was released by OpenAI on September 12, 2024, as a flagship model in the GPT line.
o1-preview, the first model in OpenAI's new o1 series of reasoning models that spend more time thinking before they answer, solved 56.7% of AIME 2024 math problems versus 13.4% for GPT-4o; the full o1, then still in development, scored 83.3%.
Compared with GPT-4o · comparison chosen by OpenAI
o1-preview solves more than half the problems on a math olympiad qualifying exam
AIME 2024 — qualifying exam for the USA Math Olympiad; majority answer over 64 attempts; o1-preview is the version released that day
56.7%
▲ up from 13.4% for GPT-4o · +43.3 points · the full o1, then still in development, scored 83.3%
Costs developers 3 to 4 times as much as GPT-4o
Price per 1M tokens — what developers pay, input / output
$15 / $60
vs $5 / $15 for GPT-4o at launch · input 3x, output 4x
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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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