Claude Opus 4

Our most capable model

Claude Opus 4 is Anthropic's flagship model and the world's best coding model, leading benchmarks like SWE-bench with 72.5% performance and excelling at complex, long-running tasks that require sustained effort over several hours. The model features hybrid reasoning capabilities that allow it to switch between instant responses and extended thinking modes, while demonstrating advanced memory capabilities and tool use that enable it to work autonomously on multi-step workflows and agent applications.