Claude Opus 5 (Medium) vs Step 3.5 Flash 2603

Claude Opus 5 (Medium) 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 (Medium)Off the frontier
Intelligence
44.80
Total cost
$2732
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 (Medium)Step 3.5 Flash 2603Difference
Intelligence (higher is better)44.817.0−62.1% Step 3.5 Flash 2603 is 62.1% less intelligent
Total AA cost (lower is better)$2,731.91Not reported— not comparable
End-to-end time (lower is better)13.14s21.03s+60.0% Step 3.5 Flash 2603 is 60.0% slower
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 (Medium): 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-medium/step-3-5-flash · Markdown: /api/v1/compare/claude-opus-5-medium/step-3-5-flash?format=md · llms.txt · agent skill