Glossary
What is a Reasoning Model?
Extended thinking and chain-of-thought in modern LLMs.
What is a reasoning model?
Reasoning models are LLMs trained to think step-by-step before answering. Models like OpenAI's o1/o3 and Claude's extended thinking spend more compute on complex problems, improving accuracy on math, coding, and logic tasks.
Key Reasoning Models (2025-2026)
- OpenAI o3: Latest reasoning model with improved accuracy
- Claude 4 Extended: Anthropic's extended thinking mode
- Gemini 3 Deep: Google's reasoning-focused variant
Monitor reasoning model outputs
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