Claude 2.1 vs Claude Opus 4.5 (Reasoning)
Claude 2.1 vs Claude Opus 4.5 (Reasoning). 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 4.5 (Reasoning) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 5.6 | 29.1 | +419.6% Claude Opus 4.5 (Reas… is 5.2× more intelligent |
| Total AA cost (lower is better) | Not reported | Not reported | — not comparable |
| End-to-end time (lower is better) | Not reported | 25.65s | — not comparable |
| Price per 1M tokens (in / out) | — | $5.00 / $25.0 | |
| 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-4-5-thinking · Markdown: /api/v1/compare/claude-21/claude-opus-4-5-thinking?format=md · llms.txt · agent skill