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Head to head

GPT-5.6 SolvsGPT-4.1 Nano

For tasks, about a month.

Verdict · measured basis

GPT-4.1 Nano costs $0.0001 per solved task against GPT-5.6 Sol at $0.0095 — ▼ 92x cheaper. Over 200 tasks that is $2 a month.

On output token price alone GPT-4.1 Nano looks 75x cheaper. The ranking holds, but the margin changes.

Verified pricing, pass rate and cost per solved task for GPT-5.6 Sol and GPT-4.1 Nano
FigureGPT-5.6 SolGPT-4.1 Nano
Input $/Mtok$5$0.1
Output $/Mtok$30$0.4
Cached input $/Mtok$0.5$0.025
Pass rate100%72%
Cost per solved task$0.0095measured$0.0001measured
Cost per month$2$0.02

Cost per month against tasks per month · drag the marker

Monthly cost against tasks per monthLog-log lines for GPT-4.1 Nano (measured, $0.0001 per solved task), GPT-5.6 Sol (measured, $0.0095 per solved task) from 10 to 100,000 tasks a month. Marker at 200 tasks.101001k10k100k$0.001$0.01$0.1$1$10$100$1kTASKS / MONTH (log) →200 tasksGPT-4.1 Nano · MEASURED · $0.0001 per solved task$0.02GPT-5.6 Sol · MEASURED · $0.0095 per solved task$2— GPT-4.1 Nano · MEASURED— GPT-5.6 Sol · MEASURED

Solid measured · dashed modeled · dotted stale. The gap is the verdict.

Solvency Bench (solvency.dev) — first-party measurement · verified 2026-08-21 · prices from each provider's pricing page; measured rows ignore the tier · Methodology · All models at these settings