Compare / head-to-head
GPT-5 nanovsgpt-oss-120b
gpt-oss-120b leads 4 of 4 shared benchmarks. GPT-5 nano has the larger context window (400K tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
0 – 4
gpt-oss-120b leads
Cheaper per token
—
list price, input + output
Larger context
GPT-5 nano
400K tokens
Provider uptime (30d)
94.2446%
OpenAI
GPT-5 nano
OpenAI · released 2025-08-07
textvision
gpt-oss-120b
OpenAI · released 2025-08-05
text
- Context
- 131K
- Max out
- 131K
- Input /1M
- —
- Output /1M
- —
- Cached /1M
- —
- Scores
- 6 · 5 core
Quality
Benchmark matrix
4 shared · 3 only GPT-5 nano · 1 only gpt-oss-120b| Benchmark | GPT-5 nano | gpt-oss-120b | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 4 | ||||
| SWE-bench Verified | 54.7% ↗ | 62.4% ↗ | -7.7 pt | gpt-oss-120b |
| GPQA Diamond | 69.4% ↗epoch | 80.1% ↗ | -10.7 pt | gpt-oss-120b |
| AIME 2025 | 85% ↗matharena ⚠ | 90% ↗matharena ⚠ | -5 pt | gpt-oss-120b |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 81.1% ↗epoch | 88.9% ↗epoch | -7.8 pt | gpt-oss-120b |
| Only GPT-5 nano reports · 3 | ||||
| FrontierMath Tier 4 v2 (Epoch AI run) | 2.4% ↗epoch | not reported | — | — |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 20% ↗epoch | not reported | — | — |
| SimpleQA Verified | 11.7% ↗epoch | not reported | — | — |
| Only gpt-oss-120b reports · 1 | ||||
| LMArena Elo | not reported | 1365.9 ↗ | — | — |
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-5 nano minus gpt-oss-120b 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-5 nano | gpt-oss-120b | Edge |
|---|---|---|---|
| Context window | 400K tokens | 131K tokens | GPT-5 nano |
| Max output | 128K tokens | 131K tokens | gpt-oss-120b |
| Input price / 1M | $0.05 ↗ | — | — |
| Output price / 1M | $0.4 ↗ | — | — |
| Cached input / 1M | $0.005 ↗ | — | — |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $0.45 | — | — |
| Modalities | text · vision | text | GPT-5 nano |
| Released | 2025-08-07 | 2025-08-05 | — |
| Cited benchmark scores | 7 | 6 | — |
Reliability
OpenAI status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
GPT-5 nano vs …
Models sharing the most benchmarksMore matchups
gpt-oss-120b vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
Public benchmarks are a starting point. Run GPT-5 nano and gpt-oss-120b on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.