Claude Fable 5.1 (Medium, Default Fallback) vs Step 3.5 Flash 2603

Claude Fable 5.1 (Medium, 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 Fable 5.1 (Medium, Default Fallback)Off the frontier
Intelligence
48.90
Total cost
$3983
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 Fable 5.1 (Medium, Default Fallback)Step 3.5 Flash 2603Difference
Intelligence (higher is better)48.917.0−65.2% Step 3.5 Flash 2603 is 65.2% less intelligent
Total AA cost (lower is better)$3,983.28Not reported— not comparable
End-to-end time (lower is better)13.44s20.25s+50.7% Step 3.5 Flash 2603 is 50.7% slower
Price per 1M tokens (in / out)$10.0 / $50.0$0.10 / $0.30
Input modalitiesText, ImageText
Open this matchup in the interactive pickerClaude Fable 5.1 (Medium, 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-fable-5-1-medium/step-3-5-flash · Markdown: /api/v1/compare/claude-fable-5-1-medium/step-3-5-flash?format=md · llms.txt · agent skill