Compare / head-to-head
GPT-4o minivsgpt-oss-20b
gpt-oss-20b leads 2 of 2 shared benchmarks. gpt-oss-20b has the larger context window (131K tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
0 – 2
gpt-oss-20b leads
Cheaper per token
—
list price, input + output
Larger context
gpt-oss-20b
131K tokens
Provider uptime (30d)
94.2446%
OpenAI
GPT-4o mini
OpenAI · released 2024-07-18
textvision
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
2 shared · 4 only GPT-4o mini · 3 only gpt-oss-20b| Benchmark | GPT-4o mini | gpt-oss-20b | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 2 | ||||
| GPQA Diamond | 40.2% ↗ | 71.5% ↗ | -31.3 pt | gpt-oss-20b |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 6.9% ↗epoch | 65.3% ↗epoch | -58.4 pt | gpt-oss-20b |
| Only GPT-4o mini reports · 4 | ||||
| MMLU | 82% ↗ | not reported | — | — |
| AIME 2024 | 8.6% ↗ | not reported | — | — |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 0.7% ↗epoch | not reported | — | — |
| SimpleQA Verified | 8.3% ↗epoch | not reported | — | — |
| Only gpt-oss-20b reports · 3 | ||||
| SWE-bench Verified | not reported | 60.7% ↗ | — | — |
| AIME 2025 | not reported | 89.2% ↗matharena ⚠ | — | — |
| LMArena Elo | not reported | 1287.3 ↗ | — | — |
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-4o mini 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-4o mini | gpt-oss-20b | Edge |
|---|---|---|---|
| Context window | 128K tokens | 131K tokens | gpt-oss-20b |
| Max output | 16K tokens | 131K tokens | gpt-oss-20b |
| Input price / 1M | $0.15 ↗ | — | — |
| Output price / 1M | $0.6 ↗ | — | — |
| Cached input / 1M | $0.075 ↗ | — | — |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $0.75 | — | — |
| Modalities | text · vision | text | GPT-4o mini |
| Released | 2024-07-18 | 2025-08-05 | — |
| Cited benchmark scores | 7 | 6 | — |
Reliability
OpenAI status
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Which one wins on your data?
Public benchmarks are a starting point. Run GPT-4o mini and gpt-oss-20b on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.