Head to head
Step 3.5 Flashvsgpt-oss-120b
For tasks, about a month.
Verdict · measured basis
gpt-oss-120b costs $0.0011 per solved task against
Step 3.5 Flash at $0.0031 — ▼ 3.0x cheaper.
Over 200 tasks that is $0.41 a month.
On output token price alone gpt-oss-120b looks 1.8x cheaper. The ranking holds, but the margin changes.
Verified pricing, pass rate and cost per solved task for Step 3.5 Flash and gpt-oss-120b| Figure | Step 3.5 Flash | gpt-oss-120b |
|---|
| Input $/Mtok | $0.1 | $0.037 |
|---|
| Output $/Mtok | $0.3 | $0.17 |
|---|
| Cached input $/Mtok | $0.1 | $0.037 |
|---|
| Pass rate | 50% | 60% |
|---|
| Cost per solved task | $0.0031measured | $0.0011measured |
|---|
| Cost per month | $0.62 | $0.21 |
|---|
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