Lineage · Since 2024
The OpenAI o1 lineage
OpenAI's reasoning-first model line, which spends inference-time compute on a private chain of thought before answering.
Generation 1 · Dec 5, 2024
OpenAI o1
OpenAI o1 is a reasoning model that thinks through a problem internally before replying, trading latency and cost for much higher accuracy on maths, science and difficult programming tasks. It reached general availability in December 2024 and set the template for later reasoning models.
Closed200K ctxMultimodalExtended step-by-step reasoning before answeringCompetition-level mathematics and physics problems