Architecture
Reasoning model
A model trained to think step by step before answering, improving results on maths, coding and complex problems at the cost of time and tokens.
Reasoning models such as o3 and the thinking modes of Claude and Gemini generate internal reasoning before the final answer. That reasoning is billed as output, so hard questions can cost noticeably more.
Frequently asked questions
What does Reasoning model mean?
A model trained to think step by step before answering, improving results on maths, coding and complex problems at the cost of time and tokens. Reasoning models such as o3 and the thinking modes of Claude and Gemini generate internal reasoning before the final answer. That reasoning is billed as output, so hard questions can cost noticeably more.