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What is a Reasoning Model?

Definition

Reasoning Model

A Reasoning Model (or o1-style model) is an artificial intelligence model trained to perform reinforcement learning and execute chain-of-thought steps internally before returning an answer. This allows the model to deliberate, correct mistakes, and evaluate strategies.

Why It Matters for AI Builders

Helps AI builders design and scale robust architectures; mastering the implementation of Reasoning Model improves latency, accuracy, and operational efficiency for complex code generation, advanced mathematics solving, and scientific research analysis.

Detailed Deep Dive

A reasoning model is a class of Large Language Models specifically trained to perform explicit, step-by-step thinking (system 2 thinking) before generating outputs. By incorporating a hidden thinking phase where the model self-corrects, plans, and decomposes problems, reasoning models achieve high accuracy in mathematics, coding, and logic.

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Frequently Asked Questions

Q:How do reasoning models differ from standard LLMs?

Standard LLMs output text instantly on a token-by-token basis. Reasoning models generate internal 'thinking tokens' to plan and check their work before writing the final output.

Q:Do thinking tokens count toward API costs?

Yes, thinking tokens require computation during inference and are typically charged as input/output tokens.

Quick Facts

  • CategoryFoundational AI
  • Key ApplicationComplex code generation, advanced mathematics solving, and scientific research analysis.

Coverage Trend12 Weeks

12w agoToday

Cite This Term

Reasoning Model Media Coverage & Intelligence

MODEL RELEASEJul 24, 2026

Anthropic Unveils Claude Opus 5 with 1M Context Window and Native Extended Reasoning

Anthropic ships its flagship Opus 5 model, delivering frontier reasoning performance at 50% lower output latency.

MODEL RELEASEJun 25, 2026

The White House is asking OpenAI to slow roll the release of its new model over safety concerns

penAI reportedly plans to share its newest model, GPT 5.6, with a select group of partners instead of to the broader public. The reason: the Trump...

FUNDINGJun 12, 2026

Kimi K2.7-Code cuts thinking tokens 30% - but practitioners say the benchmarks don't check out

Moonshot AI released Kimi K2.7-Code this week, an open-source update to its K2 coding model family, claiming leaner reasoning and double-digit performance...