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SOLVENCY

Head to head

o3-pro vs Gemini 2.5 Pro

o3-pro: legacyGemini 2.5 Pro: legacyheavy tier

Verdict · modelled basis

Gemini 2.5 Pro costs 11x less per solved task.

On output token price alone, Gemini 2.5 Pro looks 8.0x cheaper (16x 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
  • Gemini 2.5 Pro$1.25

Output $/M tokens

lower is better

  • o3-pro$80
  • Gemini 2.5 Pro$10

Cost per solved task

modelled basis · lower is better

  • o3-pro$19.08
  • Gemini 2.5 Pro$1.76
o3-proGemini 2.5 Pro
Input $/Mtok$20$1.25
Output $/Mtok$80$10
Cached input $/Mtokmissing$0.125
Pass rate85%83%
Pass rate sourceAiderAider
Cost basismodelledmodelled
Cost per solved task$19.08$1.76

verified 2026-08-21 · heavy task tier; measured rows ignore the tier· Methodology· o3-pro· Gemini 2.5 Pro