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Head to head

Gemma 4 31BvsUI-TARS 7B

For tasks, about a month.

Verdict · measured basis

Gemma 4 31B costs $0.0001 per solved task against UI-TARS 7B at $0.0003 — ▼ 3.1x cheaper. Over 200 tasks that is $0.04 a month.

On output token price alone UI-TARS 7B looks 1.7x 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 Gemma 4 31B and UI-TARS 7B
FigureGemma 4 31BUI-TARS 7B
Input $/Mtok$0.09$0.1
Output $/Mtok$0.34$0.2
Cached input $/Mtok$0.05$0.1
Pass rate83%25%
Cost per solved task$0.0001measured$0.0003measured
Cost per month$0.02$0.05

Cost per month against tasks per month · drag the marker

Monthly cost against tasks per monthLog-log lines for Gemma 4 31B (measured, $0.0001 per solved task), UI-TARS 7B (measured, $0.0003 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 tasksGemma 4 31B · MEASURED · $0.0001 per solved task$0.02UI-TARS 7B · MEASURED · $0.0003 per solved task$0.05— Gemma 4 31B · MEASURED— UI-TARS 7B · 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