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SOLVENCY

Head to head

o3 vs o3-pro

o3: legacyo3-pro: legacyheavy tier

Verdict · modelled basis

o3 costs 9.6x less per solved task.

On output token price alone, o3 looks 10x cheaper (10x 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$2
  • o3-pro$20

Output $/M tokens

lower is better

  • o3$8
  • o3-pro$80

Cost per solved task

modelled basis · lower is better

  • o3$1.99
  • o3-pro$19.08
o3o3-pro
Input $/Mtok$2$20
Output $/Mtok$8$80
Cached input $/Mtok$0.5missing
Pass rate81%85%
Pass rate sourceAiderAider
Cost basismodelledmodelled
Cost per solved task$1.99$19.08

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