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SOLVENCY

Head to head

GPT-4.1 vs Gemini 2.5 Pro

GPT-4.1 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 GPT-4.1 at $1.37 — ▼ 1.8x cheaper. Over 200 tasks that is $118 a month.

On output token price alone GPT-4.1 looks 1.3x cheaper. The ranking reverses once you divide by pass rate — the cheaper tokens do not win the task.

Verified pricing, pass rate and cost per solved task for GPT-4.1 and Gemini 2.5 Pro
FigureGPT-4.1Gemini 2.5 Pro
Input $/Mtok$2$1.25
Output $/Mtok$8$10
Cached input $/Mtok$0.5$0.125
Pass rate52%83%
Cost per solved task$1.37stale$0.78stale
Cost per month$275$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), GPT-4.1 (stale, $1.37 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$156GPT-4.1 · STALE · $1.37 per solved task$275— Gemini 2.5 Pro · STALE— GPT-4.1 · 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