Claude Opus 5 (Xhigh) vs Step 3.5 Flash 2603

Claude Opus 5 (Xhigh) vs Step 3.5 Flash 2603. A reliable intelligence-versus-cost verdict requires both models' intelligence scores and benchmark-run costs. Missing data is not a performance verdict.

AnthropicClaude Opus 5 (Xhigh)Off the frontier
Intelligence
49.70
Total cost
$5868
StepFunStep 3.5 Flash 2603Not ranked · benchmark data missing
Intelligence
17.00
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 Opus 5 (Xhigh)Step 3.5 Flash 2603Difference
Intelligence (higher is better)49.717.0−65.8% Step 3.5 Flash 2603 is 65.8% less intelligent
Total AA cost (lower is better)$5,867.76Not reported— not comparable
End-to-end time (lower is better)35.23s20.25s−42.5% Step 3.5 Flash 2603 is 42.5% faster
Price per 1M tokens (in / out)$5.00 / $25.0$0.10 / $0.30
Input modalitiesText, ImageText
Open this matchup in the interactive pickerClaude Opus 5 (Xhigh): what beats itStep 3.5 Flash 2603: 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-opus-5-xhigh/step-3-5-flash · Markdown: /api/v1/compare/claude-opus-5-xhigh/step-3-5-flash?format=md · llms.txt · agent skill