Anthropic
Previous generally available Opus release retained for compatibility. Still strong for advanced software engineering, long-running task reliability, self-verification, and high-resolution vision, but superseded by Claude Opus 5 for Anthropic's latest Opus-tier performance.
Still strong for advanced software engineering, long-running task reliability, self-verification, and high-resolution vision, but superseded by Claude Opus 5 for Anthropic's latest Opus-tier performance.
This model is still tracked for research and discovery, but it is excluded from default public rankings until it returns to active status.
48.2
Quality Score
1298
Arena ELO
Undisclosed
Parameters
1M
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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Apr 2026
Released
3/5 signals
4/4 signals
4/5 signals
1/4 signals
3/4 signals
Parameters
—
Training compute
Not reported
Dataset scale
Not reported
Base model
Not reported
Source-reported access: API access · Likely 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-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 source1298
ELO Score
1291 - 1305
95% Confidence
+/-7 points
20.0K
Battles
Jul 29, 2026
Last Updated