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SOLVENCY

Head to head

Claude Opus 4 vs Claude Sonnet 4

Claude Opus 4: retiredClaude Sonnet 4: retiredheavy tier

Verdict · modelled basis

Claude Sonnet 4 costs 4.3x less per solved task.

On output token price alone, Claude Sonnet 4 looks 5.0x cheaper (5.0x on input). The ranking holds, but the margin changes.

Source: Aider polyglot benchmark · verified 2026-08-21 · prices from each provider's pricing page

Input $/M tokens

lower is better

  • Claude Opus 4$15
  • Claude Sonnet 4$3

Output $/M tokens

lower is better

  • Claude Opus 4$75
  • Claude Sonnet 4$15

Cost per solved task

modelled basis · lower is better

  • Claude Opus 4$18.75
  • Claude Sonnet 4$4.40
Claude Opus 4Claude Sonnet 4
Input $/Mtok$15$3
Output $/Mtok$75$15
Cached input $/Mtok$1.5$0.3
Pass rate72%61%
Pass rate sourceAiderAider
Cost basismodelledmodelled
Cost per solved task$18.75$4.40

verified 2026-08-21 · heavy task tier; measured rows ignore the tier· Methodology· Claude Opus 4· Claude Sonnet 4