Claude Opus 5.5 (High, Default Fallback) vs GPT-5.3 Codex (Xhigh)
Claude Opus 5.5 (High, Default Fallback) vs GPT-5.3 Codex (Xhigh). 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 5.5 (High, Default Fallback) | GPT-5.3 Codex (Xhigh) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 53.6 | 32.5 | −39.4% GPT-5.3 Codex (Xhigh) is 39.4% less intelligent |
| Total AA cost (lower is better) | $2,172.43 | Not reported | — not comparable |
| End-to-end time (lower is better) | 33.81s | 62.23s | +84.1% GPT-5.3 Codex (Xhigh) is 84.1% slower |
| Price per 1M tokens (in / out) | $4.00 / $20.0 | $1.75 / $14.0 | |
| 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-5-5-high/gpt-5-3-codex · Markdown: /api/v1/compare/claude-opus-5-5-high/gpt-5-3-codex?format=md · llms.txt · agent skill