Anthropic
Previous Opus-tier flagship retained for compatibility after newer Claude Opus releases. Still strong on deep reasoning, extended thinking, and advanced coding, but superseded by Claude Opus 4.7 for Anthropic's latest top-end performance.
Still strong on deep reasoning, extended thinking, and advanced coding, but superseded by Claude Opus 4.7 for Anthropic's latest top-end performance.
26.1
Quality Score
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Arena ELO
Undisclosed
Parameters
200K
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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Aug 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-4-5-opus - SWE-Bench Verified
SWE-Bench Verified resolved rate 76.8
View sourceclaude-opus-4-5 - SWE-Bench Verified
SWE-Bench Verified resolved rate 79.2
View source