Claude Opus 4.1

Claude Opus 4.1 is a hybrid reasoning model that pushes the boundaries in coding and AI agents, equipped with a 200K token context window. It delivers superior performance and accuracy for real-world coding tasks and agentic applications, handling complex multi-step problems with thoroughness and attention to detail. With extended thinking capabilities, the model offers instant responses or detailed step-by-step reasoning visible through user-friendly summaries. It advances state-of-the-art coding performance to 74.5% on SWE-bench Verified, excels at agentic search and research, and produces human-quality content with exceptional writing abilities. The model supports 32K output tokens and adapts to specific coding styles, delivering exceptional quality for large-scale code generation and refactoring projects.