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Head to head

DeepSeek V4 ProvsQwen3.5-9B

For tasks, about a month.

Verdict · measured basis

Qwen3.5-9B costs $0.0038 per solved task against DeepSeek V4 Pro at $0.21 — ▼ 55x cheaper. Over 200 tasks that is $41 a month.

On output token price alone Qwen3.5-9B looks 26x cheaper. The ranking holds, but the margin changes.

Verified pricing, pass rate and cost per solved task for DeepSeek V4 Pro and Qwen3.5-9B
FigureDeepSeek V4 ProQwen3.5-9B
Input $/Mtok$1.32$0.1
Output $/Mtok$3.96$0.15
Cached input $/Mtok$0.044$0.1
Pass rate43%28%
Cost per solved task$0.21measured$0.0038measured
Cost per month$42$0.77

Cost per month against tasks per month · drag the marker

Monthly cost against tasks per monthLog-log lines for Qwen3.5-9B (measured, $0.0038 per solved task), DeepSeek V4 Pro (measured, $0.21 per solved task) from 10 to 100,000 tasks a month. Marker at 200 tasks.101001k10k100k$0.1$1$10$100$1k$10kTASKS / MONTH (log) →200 tasksQwen3.5-9B · MEASURED · $0.0038 per solved task$0.77DeepSeek V4 Pro · MEASURED · $0.21 per solved task$42— Qwen3.5-9B · MEASURED— DeepSeek V4 Pro · MEASURED

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

Source: Artificial Analysis (artificialanalysis.ai) · verified 2026-08-21 · prices from each provider's pricing page; measured rows ignore the tier · Methodology · All models at these settings