Skip to content
SOLVENCY

Head to head

GPT-5 vs GPT-4.1

GPT-5 is legacy; GPT-4.1 is legacy.

For tasks, about a month.

Verdict · stale basis

GPT-5 costs $0.74 per solved task against GPT-4.1 at $1.37 — ▼ 1.9x cheaper. Over 200 tasks that is $127 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-5 and GPT-4.1
FigureGPT-5GPT-4.1
Input $/Mtok$1.25$2
Output $/Mtok$10$8
Cached input $/Mtok$0.125$0.5
Pass rate88%52%
Cost per solved task$0.74stale$1.37stale
Cost per month$148$275

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), 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 tasksGPT-5 · STALE · $0.74 per solved task$148GPT-4.1 · STALE · $1.37 per solved task$275— GPT-5 · 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