Balanced hybrid reasoning model released May 2025, excelling in coding with 72.7% SWE-bench performance. Features dual modes for instant responses or extended thinking, making it ideal for practical AI applications requiring both speed and intelligence.
- Hybrid reasoning model with instant responses and extended thinking modes for optimal task handling
- State-of-the-art coding performance achieving 72.7% on SWE-bench with enhanced instruction following
- Superior codebase navigation and multi-file editing with 65% reduction in shortcut behavior
- Enhanced steerability and precision for complex implementations with improved tool integration
- Balanced performance and efficiency ideal for user-facing assistants and high-volume tasks
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Extended Thinking
Enhanced reasoning for complex tasks.
Model Information
Supported Formats
Claude Sonnet 4.5State-of-the-art coding model released September 2025, achieving 77.2% on SWE-bench Verified (82% with high compute). Excels at autonomous multi-step tasks for 30+ hours with enhanced tool coordination, context management, and computer use capabilities. Most aligned frontier model with improved security against prompt injection.
Claude Haiku 4.5Fast, cost-efficient model released October 2025, achieving 73.3% on SWE-bench Verified. Delivers performance comparable to Claude Sonnet 4 at one-third the cost and more than twice the speed. First Haiku model with extended thinking, computer use, and context awareness capabilities. ASL-2 safety classification with lower misalignment rates than larger models.
Claude Opus 4.5Premium model released November 2025, combining maximum intelligence with practical performance. Features 200K token context window with 64K max output, extended thinking support, and priority tier access. Knowledge cutoff March 2025 with training data through August 2025. Offers the best balance of intelligence and efficiency for complex reasoning tasks.