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 Still strong on deep reasoning, extended thinking, and advanced coding, but superseded by Claude Opus 5 for Anthropic's latest Opus-tier performance.
Still strong on deep reasoning, extended thinking, and advanced coding, but superseded by Claude Opus 5 for Anthropic's latest Opus-tier performance.
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Quality Score
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Arena ELO
Undisclosed
Parameters
200K
Context
This measures the amount of verifiable public evidence we have, not how capable the model is. A missing field means it has not been verified yet, not that its value is zero.
15 of 22 public signals
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
4/5 signals
2/4 signals
4/5 signals
1/4 signals
4/4 signals
Parameters
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Training compute
Not reported
Dataset scale
Not reported
Base model
Not reported
Source-reported access: API access · Unknown confidence
Gaps we are still tracking
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 - LiveCodeBench
LiveCodeBench pass@1 62.4 across 1055 tasks
View sourceclaude-opus-4-5 - SWE-Bench Verified
SWE-Bench Verified resolved rate 79.2
View source