# Claude 4.5 Sonnet Claude 4.5 Sonnet is Anthropic's latest frontier AI model, designed to excel in coding, complex reasoning, agentic tasks, and computer use. It represents a significant advancement over previous models like Claude Sonnet 4 and Opus 4.1, with state-of-the-art performance in benchmarks such as SWE-bench Verified (77.2%) and OSWorld (61.4%). This model maintains focus on multi-step tasks for over 30 hours, making it ideal for software development, domain-specific analysis in fields like finance, law, medicine, and STEM, and building intelligent agents. Released under AI Safety Level 3 (ASL-3) protections, Claude 4.5 Sonnet emphasizes safety and alignment, reducing behaviors like sycophancy, deception, and prompt injection vulnerabilities. ## Key Features - **Coding Excellence**: Best-in-class coding capabilities, leading on SWE-bench Verified (77.2% average over 10 trials) and supporting code execution, file creation (e.g., spreadsheets, slides, documents),
