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Head to head

Qwen3.5-9BvsQwen3 8B

For tasks, about a month.

Verdict · measured basis

Qwen3.5-9B costs $0.0038 per solved task against Qwen3 8B at $0.0043 — ▼ 1.1x cheaper. Over 200 tasks that is $0.10 a month.

On output token price alone Qwen3.5-9B looks 3.0x cheaper. The ranking holds, but the margin changes.

Verified pricing, pass rate and cost per solved task for Qwen3.5-9B and Qwen3 8B
FigureQwen3.5-9BQwen3 8B
Input $/Mtok$0.1$0.117
Output $/Mtok$0.15$0.455
Cached input $/Mtok$0.1$0.117
Pass rate28%57%
Cost per solved task$0.0038measured$0.0043measured
Cost per month$0.77$0.87

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), Qwen3 8B (measured, $0.0043 per solved task) from 10 to 100,000 tasks a month. Marker at 200 tasks.101001k10k100k$0.1$1$10$100TASKS / MONTH (log) →200 tasksQwen3.5-9B · MEASURED · $0.0038 per solved task$0.77Qwen3 8B · MEASURED · $0.0043 per solved task$0.87— Qwen3.5-9B · MEASURED— Qwen3 8B · 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