Anthropic
Previous generally available Opus release retained for compatibility after Claude Opus 5. It remains strong for complex reasoning, long-horizon agentic coding, high-autonomy work, and computer-use workflows.
OpenRouter
Price record: 2026-10-03. Source: openrouter.
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43.1
Quality Score
1279
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.
17 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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May 2026
Released
4/5 signals
4/4 signals
5/5 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 · Confident 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 sourceClaude-Opus-4 - LiveCodeBench
LiveCodeBench pass@1 62.4 across 1055 tasks
View sourceIntroducing Claude Opus 4.8
It builds on Opus 4.7 with improvements across benchmarks, and is a more effective collaborator. Opus 4.8’s capabilities The table below shows how Opus 4.8 compares to its predecessor and to other models on tests of coding, agentic skills, reasoning, and practical knowledge work tasks. More details and a much wider range of capability evaluations are provided in the Claude Opus 4.8 System Card .
View source1279
ELO Score
1272 - 1286
95% Confidence
+/-7 points
18.9K
Battles
Oct 3, 2026
Last Updated