gpt-oss-20b vs Grok 4.20 0309
OpenAI vs xAI — benchmarks, pricing, and capabilities side by side.
- •Grok 4.20 0309 has the higher intelligence index (88.5 vs 73.6)
- •gpt-oss-20b is cheaper ($0.03 vs $2.00 per 1M input)
- •gpt-oss-20b is faster
| gpt-oss-20b | Grok 4.20 0309 | |
|---|---|---|
| Intelligence index | 73.6 | 88.5 |
| Developer | OpenAI | xAI |
| Type | LLM | LLM |
| Access | Open weights | — |
| Context window | 131,072 tokens | — |
| Input price | $0.03 / 1M | $2.00 / 1M |
| Output price | $0.14 / 1M | $6.00 / 1M |
| Speed | 1000 tok/s | 97 tok/s |
| Released | August 5, 2025 | March 10, 2026 |
| Parameters | 21B (3.6B active) | — |
| Input modalities | Text | — |
| Output modalities | Text | — |
Shared benchmarks
gpt-oss-20b
Grok 4.20 0309
GPQA Diamond
71.5
88.5
Humanity’s Last Exam
17.3
30