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SOLVENCY

Head to head

o3-pro vs Gemini 2.5 Pro

o3-pro is legacy; Gemini 2.5 Pro is legacy.

For tasks, about a month.

Verdict · stale basis

Gemini 2.5 Pro costs $0.78 per solved task against o3-pro at $8.48 — ▼ 11x cheaper. Over 200 tasks that is $1.5k a month.

On output token price alone Gemini 2.5 Pro looks 8.0x cheaper. The ranking holds, but the margin changes.

Verified pricing, pass rate and cost per solved task for o3-pro and Gemini 2.5 Pro
Figureo3-proGemini 2.5 Pro
Input $/Mtok$20$1.25
Output $/Mtok$80$10
Cached input $/Mtokmissing$0.125
Pass rate85%83%
Cost per solved task$8.48stale$0.78stale
Cost per month$1.7k$156

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), o3-pro (stale, $8.48 per solved task) from 10 to 100,000 tasks a month. Marker at 200 tasks.101001k10k100k$10$100$1k$10k$100k$1MTASKS / MONTH (log) →200 tasksGemini 2.5 Pro · STALE · $0.78 per solved task$156o3-pro · STALE · $8.48 per solved task$1.7k— Gemini 2.5 Pro · STALE— o3-pro · 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