Claude Opus 4.1
Anthropic🇺🇸 United States
Incremental Opus 4 upgrade with stronger agentic coding (74.5% SWE-bench Verified) and multi-file refactoring. Superseded by Opus 4.5.
Context window200K tokens
Input / 1M tokens$15
Output / 1M tokens$75
Version History
claude-opus-4-1-launchmajor
Claude Opus 4.1 launches. Incremental Opus 4 upgrade with stronger agentic coding (74.5% SWE-bench Verified) and multi-file refactoring. Superseded by Opus 4.5.
Benchmark Scores
Full leaderboard →78.0%
AIME 2025
80.9%
GPQA
11.8%
Hallucination Rate
74.5%
SWE-bench Verified