o1

OpenAI o1 is presented as a model series built around deliberate reasoning before response generation. Its central design idea is to spend substantially more computation during inference, using long hidden chain-of-thought processing rather than relying only on immediate prediction.

This orientation makes o1 a better fit for difficult problems that benefit from extended analysis, especially tasks where a longer internal reasoning process can improve the quality of the final answer. The evidence supports a reasoning-focused role and increased inference-time capability, but does not establish a detailed architecture, training recipe, or benchmark profile.