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SOLVENCY

Head to head

o3-pro vs Claude Sonnet 4

o3-pro: legacyClaude 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 5.3x cheaper (6.7x 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

  • o3-pro$20
  • Claude Sonnet 4$3

Output $/M tokens

lower is better

  • o3-pro$80
  • Claude Sonnet 4$15

Cost per solved task

modelled basis · lower is better

  • o3-pro$19.08
  • Claude Sonnet 4$4.40
o3-proClaude Sonnet 4
Input $/Mtok$20$3
Output $/Mtok$80$15
Cached input $/Mtokmissing$0.3
Pass rate85%61%
Pass rate sourceAiderAider
Cost basismodelledmodelled
Cost per solved task$19.08$4.40

verified 2026-08-21 · heavy task tier; measured rows ignore the tier· Methodology· o3-pro· Claude Sonnet 4