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Head to head

DeepSeek V4 FlashvsQwen3.5-Flash

For tasks, about a month.

Verdict · measured basis

Qwen3.5-Flash costs $0.0015 per solved task against DeepSeek V4 Flash at $0.02 — ▼ 13x cheaper. Over 200 tasks that is $3 a month.

On output token price alone Qwen3.5-Flash looks 5.1x cheaper. The ranking holds, but the margin changes.

Verified pricing, pass rate and cost per solved task for DeepSeek V4 Flash and Qwen3.5-Flash
FigureDeepSeek V4 FlashQwen3.5-Flash
Input $/Mtok$0.44$0.065
Output $/Mtok$1.32$0.26
Cached input $/Mtok$0.014$0.065
Pass rate73%89%
Cost per solved task$0.02measured$0.0015measured
Cost per month$4$0.29

Cost per month against tasks per month · drag the marker

Monthly cost against tasks per monthLog-log lines for Qwen3.5-Flash (measured, $0.0015 per solved task), DeepSeek V4 Flash (measured, $0.02 per solved task) from 10 to 100,000 tasks a month. Marker at 200 tasks.101001k10k100k$0.01$0.1$1$10$100$1kTASKS / MONTH (log) →200 tasksQwen3.5-Flash · MEASURED · $0.0015 per solved task$0.29DeepSeek V4 Flash · MEASURED · $0.02 per solved task$4— Qwen3.5-Flash · MEASURED— DeepSeek V4 Flash · 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