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SOLVENCY

Head to head

Gemini 2.5 Pro vs Claude Sonnet 4

Gemini 2.5 Pro: legacyClaude Sonnet 4: retiredheavy tier

Verdict · modelled basis

Gemini 2.5 Pro costs 2.5x less per solved task.

On output token price alone, Gemini 2.5 Pro looks 1.5x cheaper (2.4x 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

  • Gemini 2.5 Pro$1.25
  • Claude Sonnet 4$3

Output $/M tokens

lower is better

  • Gemini 2.5 Pro$10
  • Claude Sonnet 4$15

Cost per solved task

modelled basis · lower is better

  • Gemini 2.5 Pro$1.76
  • Claude Sonnet 4$4.40
Gemini 2.5 ProClaude Sonnet 4
Input $/Mtok$1.25$3
Output $/Mtok$10$15
Cached input $/Mtok$0.125$0.3
Pass rate83%61%
Pass rate sourceAiderAider
Cost basismodelledmodelled
Cost per solved task$1.76$4.40

verified 2026-08-21 · heavy task tier; measured rows ignore the tier· Methodology· Gemini 2.5 Pro· Claude Sonnet 4