Mathematical Reasoning

Claude 3.7 Sonnet: Extended Thinking for Complex Reasoning

Anthropic's Claude 3.7 Sonnet introduces extended thinking mode for complex mathematical and logical reasoning tasks.

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Release

Anthropic released Claude 3.7 Sonnet in February 2026 with enhanced reasoning capabilities.

Key Features

  • Extended thinking: Longer inference time for complex problems
  • Hybrid model: Standard and extended thinking modes
  • Math improvements: Better performance on competition math
  • Code reasoning: Enhanced programming and debugging

Performance

  • AIME 2025: 85%+ accuracy in extended thinking mode
  • GPQA: Strong performance on graduate-level questions
  • Coding: Top-tier performance on SWE-bench

Use Cases

  • Mathematical problem solving
  • Algorithm design
  • Formal verification assistance
  • Research hypothesis generation

API

Available through Anthropic API with thinking budget controls.