gpt-oss-120b 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 79.6)
- •gpt-oss-120b is cheaper ($0.04 vs $2.00 per 1M input)
- •gpt-oss-120b is faster
| gpt-oss-120b | Grok 4.20 0309 | |
|---|---|---|
| Intelligence index | 79.6 | 88.5 |
| Developer | OpenAI | xAI |
| Type | LLM | LLM |
| Access | Open weights | — |
| Context window | 131,072 tokens | — |
| Input price | $0.04 / 1M | $2.00 / 1M |
| Output price | $0.18 / 1M | $6.00 / 1M |
| Speed | 500 tok/s | 97 tok/s |
| Released | August 5, 2025 | March 10, 2026 |
| Parameters | 117B (5.1B active) | — |
| Input modalities | Text | — |
| Output modalities | Text | — |
Shared benchmarks
gpt-oss-120b
Grok 4.20 0309
GPQA Diamond
80.9
88.5
Humanity’s Last Exam
19
30