o1-mini
ReasoningClosed weightsText
o-series family model by OpenAI.
About the o-series family
OpenAI's dedicated reasoning line (o1, o3, o4-mini, plus pro/mini variants) — models trained with reinforcement learning to 'think' in long hidden chains before answering. o1 (2024) pioneered the approach; o3/o4 refined it.
All o-series models