Head to head
vs For light moderate heavy
Verdict · measured basis
GPT-5 Nano costs $0.0010 per solved task against
gpt-oss-120b at $0.0011 — ▼ 1.0x cheaper .
Over 200 tasks that is $0.00 a month.
On output token price alone gpt-oss-120b looks 2.4x cheaper. The ranking reverses once you divide by pass rate — the cheaper tokens do not win the task.
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Verified pricing, pass rate and cost per solved task for GPT-5 Nano and gpt-oss-120b Figure GPT-5 Nano gpt-oss-120b Input $/Mtok $0.05 $0.037 Output $/Mtok $0.4 $0.17 Cached input $/Mtok $0.005 $0.037 Pass rate 100% 60% Cost per solved task $0.0010 measured $0.0011 measured Cost per month $0.21 $0.21
Cost per month against tasks per month · drag the marker
Monthly cost against tasks per month Log-log lines for GPT-5 Nano (measured, $0.0010 per solved task), gpt-oss-120b (measured, $0.0011 per solved task) from 10 to 100,000 tasks a month. Marker at 200 tasks. 10 100 1k 10k 100k $0.01 $0.1 $1 $10 $100 TASKS / MONTH (log) → 200 tasks GPT-5 Nano · MEASURED · $0.0010 per solved task $0.21 GPT-5 Nano MEASURED gpt-oss-120b · MEASURED · $0.0011 per solved task $0.21 gpt-oss-120b MEASURED Monthly cost against tasks per month Log-log lines for GPT-5 Nano (measured, $0.0010 per solved task), gpt-oss-120b (measured, $0.0011 per solved task) from 10 to 100,000 tasks a month. Marker at 200 tasks. 10 100 1k 10k 100k $0.01 $0.1 $1 $10 $100 TASKS / MONTH (log) → 200 tasks GPT-5 Nano · MEASURED · $0.0010 per solved task $0.21 gpt-oss-120b · MEASURED · $0.0011 per solved task $0.21 — GPT-5 Nano · MEASURED — gpt-oss-120b · 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