Claude 2.1 vs Claude 4 Opus (Reasoning)

Claude 2.1 vs Claude 4 Opus (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 Opus (Reasoning)Not ranked · benchmark data missing
Intelligence
20.60
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 Opus (Reasoning)Difference
Intelligence (higher is better)5.620.6+267.9% Claude 4 Opus (Reason… is 3.7× 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
Price per 1M tokens (in / out)—$15.0 / $75.0
Input modalitiesTextText, Image
Open this matchup in the interactive pickerClaude 2.1: what beats itClaude 4 Opus (Reasoning): 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-21/claude-4-opus-thinking · Markdown: /api/v1/compare/claude-21/claude-4-opus-thinking?format=md · llms.txt · agent skill