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Head to head

Step 3.5 FlashvsPhi 4

For tasks, about a month.

Verdict · measured basis

Phi 4 costs $0.0000 per solved task against Step 3.5 Flash at $0.0031 — ▼ 80x cheaper. Over 200 tasks that is $0.61 a month.

On output token price alone Phi 4 looks 2.1x cheaper. The ranking holds, but the margin changes.

Verified pricing, pass rate and cost per solved task for Step 3.5 Flash and Phi 4
FigureStep 3.5 FlashPhi 4
Input $/Mtok$0.1$0.07
Output $/Mtok$0.3$0.14
Cached input $/Mtok$0.1$0.07
Pass rate50%67%
Cost per solved task$0.0031measured$0.0000measured
Cost per month$0.62$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), Step 3.5 Flash (measured, $0.0031 per solved task) from 10 to 100,000 tasks a month. Marker at 200 tasks.101001k10k100k$0.001$0.01$0.1$1$10$100TASKS / MONTH (log) →200 tasksPhi 4 · MEASURED · $0.0000 per solved task$0.01Step 3.5 Flash · MEASURED · $0.0031 per solved task$0.62— Phi 4 · MEASURED— Step 3.5 Flash · 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