Claude Opus 4.1 (www.anthropic.com)

Anthropic has released Claude Opus 4.1, an enhanced version of its Claude Opus 4 model, focused on agentic tasks, real-world coding, and complex reasoning. Available now to paid Claude users, Claude Code, and via major cloud platforms like Amazon Bedrock and Google Cloud Vertex AI, Opus 4.1 maintains existing pricing while delivering notable performance improvements—particularly in multi-file code refactoring and precise bug detection. With a coding accuracy of 74.5% on SWE-bench Verified, this upgrade demonstrates its growing strength in software engineering benchmarks, as evidenced by endorsements from GitHub, Rakuten Group, and Windsurf, who report significant gains in debugging precision and developer-level code quality assessments. Technically, Opus 4.1 continues leveraging a hybrid reasoning architecture with extended thinking capabilities (up to 64K tokens) to enhance detailed research and agentic search functions. The model’s improved approach to multi-turn reasoning, encouraged through prompt addenda, allows it to explicitly document its thought process during complex problem-solving—leading to more reliable and nuanced outputs. Benchmark methodologies remain consistent with prior Claude releases, utilizing bash and file editing tools but no longer the earlier ‘planning tool,’ ensuring streamlined yet sophisticated code interaction. Developers are encouraged to upgrade to claude-opus-4-1-20250805 via API, unlocking these refined capabilities that push the boundaries of AI-assisted coding and analytical tasks.