Compare / head-to-head
gpt-oss-120bvsgpt-oss-20b
gpt-oss-120b leads 5 of 5 shared benchmarks. Both offer a 131K-token context window.
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
5 – 0
gpt-oss-120b leads
Cheaper per token
—
list price, input + output
Larger context
Tie
both 131K tokens
Provider uptime (30d)
95.493%
OpenAI
gpt-oss-120b
OpenAI · released 2025-08-05
text
- Context
- 131K
- Max out
- 131K
- Input /1M
- —
- Output /1M
- —
- Cached /1M
- —
- Scores
- 6 · 5 core
gpt-oss-20b
OpenAI · released 2025-08-05
text
- Context
- 131K
- Max out
- 131K
- Input /1M
- —
- Output /1M
- —
- Cached /1M
- —
- Scores
- 6 · 5 core
Quality
Benchmark matrix
5 shared · 0 only gpt-oss-120b · 0 only gpt-oss-20b| Benchmark | gpt-oss-120b | gpt-oss-20b | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 5 | ||||
| SWE-bench Verified | 62.4% ↗ | 60.7% ↗ | +1.7 pt | gpt-oss-120b |
| GPQA Diamond | 80.1% ↗ | 71.5% ↗ | +8.6 pt | gpt-oss-120b |
| AIME 2025 | 90% ↗matharena ⚠ | 89.2% ↗matharena ⚠ | +0.8 pt | gpt-oss-120b |
| LMArena Elo | 1365.9 ↗ | 1287.3 ↗ | +78.6 | gpt-oss-120b |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 88.9% ↗epoch | 65.3% ↗epoch | +23.6 pt | gpt-oss-120b |
| Only gpt-oss-120b reports · 0 | ||||
| gpt-oss-120b reports nothing gpt-oss-20b does not. | ||||
| Only gpt-oss-20b reports · 0 | ||||
| gpt-oss-20b reports nothing gpt-oss-120b does not. | ||||
Scores tagged "epoch" or "matharena" are independent runs, used only where the lab has not published its own; ⚠ marks rows MathArena flags as released after the competition. Higher is better on every row. Δ is gpt-oss-120b minus gpt-oss-20b in the benchmark's own unit. "Not reported" means the lab has not published that figure; it is not a zero. ↗ opens the source.
Specs & pricing
Side by side
Official pricing pages and model cards| Spec | gpt-oss-120b | gpt-oss-20b | Edge |
|---|---|---|---|
| Context window | 131K tokens | 131K tokens | Tie |
| Max output | 131K tokens | 131K tokens | Tie |
| Input price / 1M | — | — | — |
| Output price / 1M | — | — | — |
| Cached input / 1M | — | — | — |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | — | — | — |
| Modalities | text | text | Tie |
| Released | 2025-08-05 | 2025-08-05 | — |
| Cited benchmark scores | 6 | 6 | — |
Reliability
OpenAI status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
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