Skip to content
SOLVENCY

Head to head

GPT-5 vs o3-pro

GPT-5 is legacy; o3-pro is legacy.

For tasks, about a month.

Verdict · stale basis

GPT-5 costs $0.74 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 GPT-5 looks 8.0x cheaper. The ranking holds, but the margin changes.

Verified pricing, pass rate and cost per solved task for GPT-5 and o3-pro
FigureGPT-5o3-pro
Input $/Mtok$1.25$20
Output $/Mtok$10$80
Cached input $/Mtok$0.125missing
Pass rate88%85%
Cost per solved task$0.74stale$8.48stale
Cost per month$148$1.7k

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), 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 tasksGPT-5 · STALE · $0.74 per solved task$148o3-pro · STALE · $8.48 per solved task$1.7k— GPT-5 · 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