Anthropic
Previous flagship Claude Opus release retained for compatibility after later Claude Opus launches. Still strong for advanced reasoning, extended thinking, computer use, and coding, but superseded by Claude Opus 5 for Anthropic's latest Opus-tier performance.
Previous flagship Claude Opus release retained for compatibility after later Claude Opus launches.
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Quality Score
1293
Arena ELO
Undisclosed
Parameters
1M
Context
Use this section to answer one simple question first: how much outside evidence do we have that this model performs well? Structured benchmark scores appear first, then official provider evidence, then live arena signal.
This model has normalized benchmark rows, so scores here are directly comparable across benchmark sources.
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Dec 2025
Released
These are recent benchmark or leaderboard claims from official provider sources. They are useful for freshness and context, but they are not treated the same as normalized independent benchmark rows.
claude-opus-4-6 - SWE-Bench Verified
SWE-Bench Verified resolved rate 75.6
View sourceClaude-Opus-4 - LiveCodeBench
LiveCodeBench pass@1 62.4 across 1055 tasks
View sourceClaude-Opus-4 - LiveCodeBench
LiveCodeBench pass@1 62.4 across 1055 tasks
View sourceClaude-Opus-4 - LiveCodeBench
LiveCodeBench pass@1 62.4 across 1055 tasks
View sourceClaude-Opus-4 - LiveCodeBench
LiveCodeBench pass@1 62.4 across 1055 tasks
View sourceclaude-opus-4-6 - SWE-Bench Verified
SWE-Bench Verified resolved rate 75.6
View source1293
ELO Score
1286 - 1300
95% Confidence
+/-7 points
24.6K
Battles
Aug 19, 2026
Last Updated