Claude 2.1 vs Claude Opus 5.5 (Medium, Default Fallback)
Claude 2.1 vs Claude Opus 5.5 (Medium, Default Fallback). A reliable intelligence-versus-cost verdict requires both models' intelligence scores and benchmark-run costs. Missing data is not a performance verdict.
Verdict
Comparison incomplete
A reliable intelligence-versus-cost verdict requires both models' intelligence scores and benchmark-run costs. Missing data is not a performance verdict.
| Metric | Claude 2.1 | Claude Opus 5.5 (Medium, Default Fallback) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 5.6 | 51.2 | +814.3% Claude Opus 5.5 (Medi… is 9.1× more intelligent |
| Total AA cost (lower is better) | Not reported | $1,626.81 | — not comparable |
| End-to-end time (lower is better) | Not reported | 20.28s | — not comparable |
| Price per 1M tokens (in / out) | — | $4.00 / $20.0 | |
| Input modalities | Text | Text, Image |
Matchup
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Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/claude-21/claude-opus-5-5-medium · Markdown: /api/v1/compare/claude-21/claude-opus-5-5-medium?format=md · llms.txt · agent skill