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SOLVENCY

Head to head

GPT-5 vs Gemini 2.5 Pro

GPT-5 is legacy; Gemini 2.5 Pro is legacy.

For tasks, about a month.

Verdict · stale basis

GPT-5 costs $0.74 per solved task against Gemini 2.5 Pro at $0.78 — ▼ 1.1x cheaper. Over 200 tasks that is $9 a month.

On output token price alone GPT-5 looks 1.0x cheaper. The ranking holds, but the margin changes.

Verified pricing, pass rate and cost per solved task for GPT-5 and Gemini 2.5 Pro
FigureGPT-5Gemini 2.5 Pro
Input $/Mtok$1.25$1.25
Output $/Mtok$10$10
Cached input $/Mtok$0.125$0.125
Pass rate88%83%
Cost per solved task$0.74stale$0.78stale
Cost per month$148$156

Cost per month against tasks per month · drag the marker

Monthly cost against tasks per monthLog-log lines for GPT-5 (stale, $0.74 per solved task), Gemini 2.5 Pro (stale, $0.78 per solved task) from 10 to 100,000 tasks a month. Marker at 200 tasks.101001k10k100k$10$100$1k$10k$100kTASKS / MONTH (log) →200 tasksGPT-5 · STALE · $0.74 per solved task$148Gemini 2.5 Pro · STALE · $0.78 per solved task$156— GPT-5 · STALE— Gemini 2.5 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