On August 5, 2025, Anthropic publicly released Claude Opus 4.1, a significant refinement of its flagship Opus 4 model family, aimed at advancing agentic tasks, real-world software engineering, and complex reasoning. This incremental update, which builds on the May debut of Claude Opus 4, delivers higher accuracy on coding benchmarks, extended context handling, and maintains the company’s stringent AI safety standards.
Performance Enhancements
Benchmarking data highlights notable gains over Opus 4. On the SWE-bench Verified coding evaluation, Claude Opus 4.1 achieves a , reflecting a 2-point increase from Opus 4’s 72.5% and a substantial jump from Sonnet 3.7’s 62.3% . These gains are especially pronounced in multi-file code refactoring, debugging large codebases, and maintaining stylistic consistency across extended code outputs—enabled in part by the model’s expanded context window for up to , which supports complex, multi-step code generation and transformations .
