Claude 3.7 Sonnet
by Anthropic
First hybrid reasoning model released February 2025, combining instant responses with visible extended thinking. Achieves state-of-the-art performance on SWE-bench and TAU-bench with significant improvements in coding and front-end development.
- First hybrid reasoning model integrating instant responses with extended thinking in one unified system
- State-of-the-art coding performance with 70.3% on SWE-bench Verified and exceptional frontend development
- Visible thought process in raw form with controllable thinking budgets up to 128K tokens
- 45% reduction in unnecessary refusals with improved understanding of harmful vs benign requests
- Enhanced agentic capabilities with improved computer use and multi-step task completion
Web Search
Search the web for current info.
Extended Thinking
Enhanced reasoning for complex tasks.
Web Fetch
Fetch and read full content from any URL.
Code Execution
Run Python & Bash code in a sandbox.
JSON Mode
Output responses in valid JSON format.
Model Information
Supported Formats
Claude Fable 5Anthropic's most capable widely released model, for the most demanding reasoning and long-horizon agentic work. Thinking is always on with a 1M token context window (also the maximum) and 128K max output. Priced above the Opus tier for the highest capability ceiling in the Claude lineup.
Claude Opus 5Anthropic's successor to Opus 4.8 for complex agentic coding and enterprise work. Strongest on deep reasoning, agentic and long-horizon work, and test-time compute scaling, at half the cost of Claude Fable 5. Thinking is on by default with a 1M token context window and 128K max output.
Claude Sonnet 5Best combination of speed and intelligence in the Sonnet tier, delivering near-Opus quality on coding and agentic work. Successor to Sonnet 4.6 with adaptive thinking on by default, a 1M token context window, and 128K max output.