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SOLVENCY

Head to head

Claude Opus 5 vs DeepSeek V4 Flash

Claude Opus 5: currentDeepSeek V4 Flash: currentheavy tier

Verdict · measured basis

DeepSeek V4 Flash costs 100x less per solved task.

On output token price alone, DeepSeek V4 Flash looks 19x cheaper (11x on input). The ranking holds, but the margin changes.

Source: Artificial Analysis (artificialanalysis.ai) · verified 2026-08-21 · prices from each provider's pricing page

Input $/M tokens

lower is better

  • Claude Opus 5$5
  • DeepSeek V4 Flash$0.44

Output $/M tokens

lower is better

  • Claude Opus 5$25
  • DeepSeek V4 Flash$1.32

Cost per solved task

measured basis · lower is better

  • Claude Opus 5$12.01
  • DeepSeek V4 Flash$0.12
Claude Opus 5DeepSeek V4 Flash
Input $/Mtok$5$0.44
Output $/Mtok$25$1.32
Cached input $/Mtok$0.5$0.014
Pass rate68%50%
Pass rate sourceAAAA
Cost basismeasuredmeasured
Cost per solved task$12.01$0.12

verified 2026-08-21 · heavy task tier; measured rows ignore the tier· Methodology· Claude Opus 5· DeepSeek V4 Flash