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SOLVENCY

Head to head

o3 vs Gemini 2.5 Pro

o3: legacyGemini 2.5 Pro: legacyheavy tier

Verdict · modelled basis

Gemini 2.5 Pro costs 1.1x less per solved task.

On output token price alone, o3 looks 1.3x cheaper (1.6x on input). The ranking reverses once you divide by pass rate — the cheaper tokens do not win the task.

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

Input $/M tokens

lower is better

  • o3$2
  • Gemini 2.5 Pro$1.25

Output $/M tokens

lower is better

  • o3$8
  • Gemini 2.5 Pro$10

Cost per solved task

modelled basis · lower is better

  • o3$1.99
  • Gemini 2.5 Pro$1.76
o3Gemini 2.5 Pro
Input $/Mtok$2$1.25
Output $/Mtok$8$10
Cached input $/Mtok$0.5$0.125
Pass rate81%83%
Pass rate sourceAiderAider
Cost basismodelledmodelled
Cost per solved task$1.99$1.76

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