Head to head
Solar Pro 4vsQwen3.5-9B
For tasks, about a month.
Verdict · measured basis
Solar Pro 4 costs $0.0003 per solved task against
Qwen3.5-9B at $0.0038 — ▼ 13x cheaper.
Over 200 tasks that is $0.71 a month.
On output token price alone Qwen3.5-9B looks 8.0x 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 Solar Pro 4 and Qwen3.5-9B| Figure | Solar Pro 4 | Qwen3.5-9B |
|---|
| Input $/Mtok | $0.3 | $0.1 |
|---|
| Output $/Mtok | $1.2 | $0.15 |
|---|
| Cached input $/Mtok | $0.06 | $0.1 |
|---|
| Pass rate | 75% | 28% |
|---|
| Cost per solved task | $0.0003measured | $0.0038measured |
|---|
| Cost per month | $0.06 | $0.77 |
|---|
Cost per month against tasks per month · drag the marker
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