# Claude Sonnet 4 Claude Sonnet 4 is a hybrid reasoning model that offers both near-instant responses and extended thinking capabilities. It significantly improves upon Claude Sonnet 3.7's performance while maintaining efficiency for everyday use cases. ## Key Capabilities ### Dual Operating Modes - **Standard mode**: Fast responses for typical tasks - **Extended thinking**: Deep reasoning for complex problems (up to 64K tokens) ### Core Features - Advanced coding capabilities with 72.7% performance on SWE-bench - Enhanced instruction following and steerability - Parallel tool execution - Memory improvements when given access to local files - Web search integration during extended thinking (beta) - 65% reduction in shortcut/loophole behavior compared to Sonnet 3.7 ## Performance Benchmarks ### Coding - SWE-bench Verified: 72.7% - Described as "state-of-the-art" for coding tasks ### Reasoning (with extended thinking) - GPQA Diamond: 75.5% (70.0% w
