Changes from previous version
Incremental Opus 4 refresh focused on real-world coding precision and research workflows before the Opus 4.6 line.
Release Summary
Upgrade to Claude Opus 4 with 74.5% SWE-bench Verified, stronger agentic search, and improved multi-file refactoring at the same Opus 4 API pricing.
Timeline
August 5, 2025
Claude Opus 4.1 released
Anthropic releases Opus 4.1 on Claude, Claude Code, and the API as claude-opus-4-1-20250805.