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SOLVENCY

Head to head

GPT-4.1 vs Claude Sonnet 4

GPT-4.1 is legacy; Claude Sonnet 4 is retired.

For tasks, about a month.

Verdict · stale basis

GPT-4.1 costs $1.37 per solved task against Claude Sonnet 4 at $1.96 — ▼ 1.4x cheaper. Over 200 tasks that is $117 a month.

On output token price alone GPT-4.1 looks 1.9x cheaper. The ranking holds, but the margin changes.

Verified pricing, pass rate and cost per solved task for GPT-4.1 and Claude Sonnet 4
FigureGPT-4.1Claude Sonnet 4
Input $/Mtok$2$3
Output $/Mtok$8$15
Cached input $/Mtok$0.5$0.3
Pass rate52%61%
Cost per solved task$1.37stale$1.96stale
Cost per month$275$392

Cost per month against tasks per month · drag the marker

Monthly cost against tasks per monthLog-log lines for GPT-4.1 (stale, $1.37 per solved task), Claude Sonnet 4 (stale, $1.96 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-4.1 · STALE · $1.37 per solved task$275Claude Sonnet 4 · STALE · $1.96 per solved task$392— GPT-4.1 · STALE— Claude Sonnet 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