Claude 4 Opus (Reasoning) vs GPT-5.3 Codex (Xhigh)

Claude 4 Opus (Reasoning) 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.

AnthropicClaude 4 Opus (Reasoning)Not ranked · benchmark data missing
Intelligence
20.60
Total cost
-
OpenAIGPT-5.3 Codex (Xhigh)Not ranked · benchmark data missing
Intelligence
32.50
Total cost
-
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.

MetricClaude 4 Opus (Reasoning)GPT-5.3 Codex (Xhigh)Difference
Intelligence (higher is better)20.632.5+57.8% GPT-5.3 Codex (Xhigh) is 57.8% more intelligent
Total AA cost (lower is better)Not reportedNot reported— not comparable
End-to-end time (lower is better)Not reported62.23s— not comparable
Price per 1M tokens (in / out)$15.0 / $75.0$1.75 / $14.0
Input modalitiesText, ImageText, Image
Open this matchup in the interactive pickerClaude 4 Opus (Reasoning): what beats itGPT-5.3 Codex (Xhigh): what beats it
Matchup

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Agents: Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/claude-4-opus-thinking/gpt-5-3-codex · Markdown: /api/v1/compare/claude-4-opus-thinking/gpt-5-3-codex?format=md · llms.txt · agent skill