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SOLVENCY

Head to head

Gemini 2.5 Pro vs Claude Sonnet 4

Gemini 2.5 Pro is legacy; Claude Sonnet 4 is retired.

For tasks, about a month.

Verdict · stale basis

Gemini 2.5 Pro costs $0.78 per solved task against Claude Sonnet 4 at $1.96 — ▼ 2.5x cheaper. Over 200 tasks that is $235 a month.

On output token price alone Gemini 2.5 Pro looks 1.5x cheaper. The ranking holds, but the margin changes.

Verified pricing, pass rate and cost per solved task for Gemini 2.5 Pro and Claude Sonnet 4
FigureGemini 2.5 ProClaude Sonnet 4
Input $/Mtok$1.25$3
Output $/Mtok$10$15
Cached input $/Mtok$0.125$0.3
Pass rate83%61%
Cost per solved task$0.78stale$1.96stale
Cost per month$156$392

Cost per month against tasks per month · drag the marker

Monthly cost against tasks per monthLog-log lines for Gemini 2.5 Pro (stale, $0.78 per solved task), Claude Sonnet 4 (stale, $1.96 per solved task) from 10 to 100,000 tasks a month. Marker at 200 tasks.101001k10k100k$10$100$1k$10k$100kTASKS / MONTH (log) →200 tasksGemini 2.5 Pro · STALE · $0.78 per solved task$156Claude Sonnet 4 · STALE · $1.96 per solved task$392— Gemini 2.5 Pro · STALE— Claude Sonnet 4 · STALE

Solid measured · dashed modelled · dotted stale. The gap is the verdict.

Source: Aider polyglot benchmark · verified 2026-08-21 · prices from each provider's pricing page; measured rows ignore the tier · Methodology · All models at these settings