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SOLVENCY

Head to head

GPT-5 vs Claude Opus 4

GPT-5 is legacy; Claude Opus 4 is retired.

For tasks, about a month.

Verdict · stale basis

GPT-5 costs $0.74 per solved task against Claude Opus 4 at $8.33 — ▼ 11x cheaper. Over 200 tasks that is $1.5k a month.

On output token price alone GPT-5 looks 7.5x cheaper. The ranking holds, but the margin changes.

Verified pricing, pass rate and cost per solved task for GPT-5 and Claude Opus 4
FigureGPT-5Claude Opus 4
Input $/Mtok$1.25$15
Output $/Mtok$10$75
Cached input $/Mtok$0.125$1.5
Pass rate88%72%
Cost per solved task$0.74stale$8.33stale
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), Claude Opus 4 (stale, $8.33 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$148Claude Opus 4 · STALE · $8.33 per solved task$1.7k— GPT-5 · STALE— Claude Opus 4 · 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