Claude Opus 5.5 (Low, Default Fallback) vs Step 3.5 Flash 2603

Claude Opus 5.5 (Low, Default Fallback) 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 5.5 (Low, Default Fallback)Off the frontier
Intelligence
42.30
Total cost
$860
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 5.5 (Low, Default Fallback)Step 3.5 Flash 2603Difference
Intelligence (higher is better)42.317.0−59.8% Step 3.5 Flash 2603 is 59.8% less intelligent
Total AA cost (lower is better)$860.33Not reported— not comparable
End-to-end time (lower is better)11.02s20.25s+83.8% Step 3.5 Flash 2603 is 83.8% slower
Price per 1M tokens (in / out)$4.00 / $20.0$0.10 / $0.30
Input modalitiesText, ImageText
Open this matchup in the interactive pickerClaude Opus 5.5 (Low, Default Fallback): 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-5-5-low/step-3-5-flash · Markdown: /api/v1/compare/claude-opus-5-5-low/step-3-5-flash?format=md · llms.txt · agent skill