Skip to content
SOLVENCY

Head to head

GPT-5 vs o3

GPT-5 is legacy; o3 is legacy.

For tasks, about a month.

Verdict · stale basis

GPT-5 costs $0.74 per solved task against o3 at $0.89 — ▼ 1.2x cheaper. Over 200 tasks that is $29 a month.

On output token price alone o3 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-5 and o3
FigureGPT-5o3
Input $/Mtok$1.25$2
Output $/Mtok$10$8
Cached input $/Mtok$0.125$0.5
Pass rate88%81%
Cost per solved task$0.74stale$0.89stale
Cost per month$148$177

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 (stale, $0.89 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$148o3 · STALE · $0.89 per solved task$177— GPT-5 · STALE— o3 · 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