GPT-5.1 Codex (High) vs Mercury 2.5

GPT-5.1 Codex (High) vs Mercury 2.5. A reliable intelligence-versus-cost verdict requires both models' intelligence scores and benchmark-run costs. Missing data is not a performance verdict.

OpenAIGPT-5.1 Codex (High)Not ranked · benchmark data missing
Intelligence
23.70
Total cost
-
InceptionMercury 2.5Off the frontier
Intelligence
12.30
Total cost
$218
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.

MetricGPT-5.1 Codex (High)Mercury 2.5Difference
Intelligence (higher is better)23.712.3−48.1% Mercury 2.5 is 48.1% less intelligent
Total AA cost (lower is better)Not reported$218.11— not comparable
End-to-end time (lower is better)12.02s4.32s−64.1% Mercury 2.5 is 64.1% faster
Price per 1M tokens (in / out)$1.25 / $10.0$0.25 / $0.75
Input modalitiesText, ImageText
Open this matchup in the interactive pickerGPT-5.1 Codex (High): what beats itMercury 2.5: what beats it
Matchup

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Agents: Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/gpt-5-1-codex/mercury-2-5 · Markdown: /api/v1/compare/gpt-5-1-codex/mercury-2-5?format=md · llms.txt · agent skill