Anthropic iconAnthropic: Claude Sonnet 4.5

Model Type

Proprietary model icon

Proprietary Model

API access only

Recommended Use Cases

Text Generation

Try Claude Sonnet 4.5

The balanced, high-performance model in the Claude family from Anthropic (September 2025).

Per Anthropic:

Sonnet 4.5 is the best model in the world for agents, coding, and computer use. It's also our most accurate and detailed model for long-running tasks, with enhanced domain knowledge in coding, finance, and cybersecurity.

Key Capabilities

  • Coding: 77.2% on SWE-bench Verified; excels across the entire software development lifecycle
  • Computer Use: 61.4% on OSWorld; best computer-using model for browser-based tasks
  • Agents: Superior instruction following, tool selection, and error correction

Key Features

  • Context Window: 200K tokens
  • Extended Thinking: Hybrid reasoning with instant or step-by-step responses
  • Output Tokens: Up to 64K

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