Claude Opus 5.5 (Max, Default Fallback) vs DeepSeek V3.1 Terminus (Reasoning)

Claude Opus 5.5 (Max, Default Fallback) vs DeepSeek V3.1 Terminus (Reasoning). 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 (Max, Default Fallback)On the frontier
Intelligence
57.60
Total cost
$8708
DeepSeekDeepSeek V3.1 Terminus (Reasoning)Not ranked · benchmark data missing
Intelligence
14.80
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 (Max, Default Fallback)DeepSeek V3.1 Terminus (Reasoning)Difference
Intelligence (higher is better)57.614.8−74.3% DeepSeek V3.1 Terminu… is 74.3% less intelligent
Total AA cost (lower is better)$8,708.20Not reported— not comparable
End-to-end time (lower is better)626.13sNot reported— not comparable
Price per 1M tokens (in / out)$4.00 / $20.0$1.64 / $2.75
Input modalitiesText, ImageText
Open this matchup in the interactive pickerClaude Opus 5.5 (Max, Default Fallback): what beats itDeepSeek V3.1 Terminus (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-opus-5-5/deepseek-v3-1-terminus-reasoning · Markdown: /api/v1/compare/claude-opus-5-5/deepseek-v3-1-terminus-reasoning?format=md · llms.txt · agent skill