Claude 2.1 vs Claude 4 Sonnet (Reasoning)

Claude 2.1 vs Claude 4 Sonnet (Reasoning). A reliable intelligence-versus-cost verdict requires both models' intelligence scores and benchmark-run costs. Missing data is not a performance verdict.

AnthropicClaude 2.1Not ranked · benchmark data missing
Intelligence
5.60
Total cost
-
AnthropicClaude 4 Sonnet (Reasoning)Not ranked · benchmark data missing
Intelligence
18.90
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 2.1Claude 4 Sonnet (Reasoning)Difference
Intelligence (higher is better)5.618.9+237.5% Claude 4 Sonnet (Reas… is 3.4× more intelligent
Total AA cost (lower is better)Not reportedNot reported— not comparable
End-to-end time (lower is better)Not reportedNot reported— not comparable
Input modalitiesTextText, Image
Open this matchup in the interactive pickerClaude 2.1: what beats itClaude 4 Sonnet (Reasoning): what beats it
Matchup

Compare something else

Agents: Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/claude-21/claude-4-sonnet-thinking · Markdown: /api/v1/compare/claude-21/claude-4-sonnet-thinking?format=md · llms.txt · agent skill