Compare / head-to-head
gpt-oss-20bvsGrok 4.20 Reasoning
Grok 4.20 Reasoning leads 2 of 2 shared benchmarks. Grok 4.20 Reasoning has the larger context window (1M tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
0 – 2
Grok 4.20 Reasoning leads
Cheaper per token
—
list price, input + output
Larger context
Grok 4.20 Reasoning
1M tokens
Provider uptime (30d)
94.9686% · —
OpenAI · xAI
gpt-oss-20b
OpenAI · released 2025-08-05
text
- Context
- 131K
- Max out
- 131K
- Input /1M
- —
- Output /1M
- —
- Cached /1M
- —
- Scores
- 6 · 5 core
Grok 4.20 Reasoning
xAI · released 2026-03-09
textvision
Quality
Benchmark matrix
2 shared · 3 only gpt-oss-20b · 3 only Grok 4.20 Reasoning| Benchmark | gpt-oss-20b | Grok 4.20 Reasoning | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 2 | ||||
| GPQA Diamond | 71.5% ↗ | 89.3% ↗epoch | -17.8 pt | Grok 4.20 Reasoning |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 65.3% ↗epoch | 92.2% ↗epoch | -26.9 pt | Grok 4.20 Reasoning |
| Only gpt-oss-20b reports · 3 | ||||
| SWE-bench Verified | 60.7% ↗ | not reported | — | — |
| AIME 2025 | 89.2% ↗matharena ⚠ | not reported | — | — |
| LMArena Elo | 1287.3 ↗ | not reported | — | — |
| Only Grok 4.20 Reasoning reports · 3 | ||||
| FrontierMath Tier 4 v2 (Epoch AI run) | not reported | 17.1% ↗epoch | — | — |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | not reported | 44.9% ↗epoch | — | — |
| SimpleQA Verified | not reported | 30.2% ↗epoch | — | — |
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-20b minus Grok 4.20 Reasoning 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-20b | Grok 4.20 Reasoning | Edge |
|---|---|---|---|
| Context window | 131K tokens | 1M tokens | Grok 4.20 Reasoning |
| Max output | 131K tokens | — | — |
| Input price / 1M | — | $1.25 ↗ | — |
| Output price / 1M | — | $2.5 ↗ | — |
| Cached input / 1M | — | $0.2 ↗ | — |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | — | $3.75 | — |
| Modalities | text | text · vision | Grok 4.20 Reasoning |
| Released | 2025-08-05 | 2026-03-09 | — |
| Cited benchmark scores | 6 | 5 | — |
Reliability
Provider status
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