Claude Opus 4.1, released on August 5, 2025, is an upgrade to Claude Opus 4, enhancing agentic tasks, real-world coding, and reasoning capabilities. It is available to paid Claude users, Claude Code, and through API integrations including Amazon Bedrock and Google Cloud's Vertex AI, with pricing unchanged from Opus 4.
Performance Improvements
Opus 4.1 achieves 74.5% coding performance on SWE-bench Verified, marking a significant advancement in state-of-the-art coding. It also enhances Claude’s research and data analysis skills, particularly in detail tracking and agentic search.
User and Industry Feedback
- GitHub highlights improvements across most capabilities, especially in multi-file code refactoring.
- Rakuten Group praises Opus 4.1 for its precision in pinpointing exact corrections within large codebases without unnecessary changes or bugs, making it preferred for everyday debugging.
- Windsurf reports a one standard deviation improvement over Opus 4 on their junior developer benchmark, comparable to the leap from Sonnet 3.7 to Sonnet 4.
Recommendations and Access
Users are encouraged to upgrade from Opus 4 to Opus 4.1. Developers can access the new model via the API using claude-opus-4-1-20250805. Additional resources such as the system card, model page, pricing page, and documentation are available for further details.
Feedback remains important to guide ongoing improvements as more capable models are planned for future release.
