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Head to head

GPT-4.1 NanovsPhi 4

For tasks, about a month.

Verdict · measured basis

Phi 4 costs $0.0000 per solved task against GPT-4.1 Nano at $0.0001 — ▼ 2.6x cheaper. Over 200 tasks that is $0.01 a month.

On output token price alone Phi 4 looks 2.9x cheaper. The ranking holds, but the margin changes.

Verified pricing, pass rate and cost per solved task for GPT-4.1 Nano and Phi 4
FigureGPT-4.1 NanoPhi 4
Input $/Mtok$0.1$0.07
Output $/Mtok$0.4$0.14
Cached input $/Mtok$0.025$0.07
Pass rate72%67%
Cost per solved task$0.0001measured$0.0000measured
Cost per month$0.02$0.01

Cost per month against tasks per month · drag the marker

Monthly cost against tasks per monthLog-log lines for Phi 4 (measured, $0.0000 per solved task), GPT-4.1 Nano (measured, $0.0001 per solved task) from 10 to 100,000 tasks a month. Marker at 200 tasks.101001k10k100k$0.001$0.01$0.1$1$10TASKS / MONTH (log) →200 tasksPhi 4 · MEASURED · $0.0000 per solved task$0.01GPT-4.1 Nano · MEASURED · $0.0001 per solved task$0.02— Phi 4 · MEASURED— GPT-4.1 Nano · MEASURED

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

Solvency Bench (solvency.dev) — first-party measurement · verified 2026-08-26 · prices from each provider's pricing page; measured rows ignore the tier · Methodology · All models at these settings