Claude Opus 4.5 (Reasoning) vs Claude Opus 5.5 (Low, Default Fallback)
Claude Opus 4.5 (Reasoning) vs Claude Opus 5.5 (Low, 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 Opus 4.5 (Reasoning) | Claude Opus 5.5 (Low, Default Fallback) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 29.1 | 42.3 | +45.4% Claude Opus 5.5 (Low,… is 45.4% more intelligent |
| Total AA cost (lower is better) | Not reported | $860.33 | — not comparable |
| End-to-end time (lower is better) | 25.65s | 13.42s | −47.7% Claude Opus 5.5 (Low,… is 47.7% faster |
| Price per 1M tokens (in / out) | $5.00 / $25.0 | $4.00 / $20.0 | |
| Input modalities | Text, Image | Text, Image |
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Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/claude-opus-4-5-thinking/claude-opus-5-5-low · Markdown: /api/v1/compare/claude-opus-4-5-thinking/claude-opus-5-5-low?format=md · llms.txt · agent skill