Grok 4.1 Fast vs Grok 4.20 0309
xAI vs xAI — benchmarks, pricing, and capabilities side by side.
- •Grok 4.20 0309 has the higher intelligence index (88.5 vs 85.6)
- •Grok 4.1 Fast is cheaper ($0.00 vs $2.00 per 1M input)
| Grok 4.1 Fast | Grok 4.20 0309 | |
|---|---|---|
| Intelligence index | 85.6 | 88.5 |
| Developer | xAI | xAI |
| Type | LLM | LLM |
| Access | — | — |
| Context window | — | — |
| Input price | $0.00 / 1M | $2.00 / 1M |
| Output price | $0.00 / 1M | $6.00 / 1M |
| Speed | — | 97 tok/s |
| Released | November 19, 2025 | March 10, 2026 |
| Parameters | — | — |
| Input modalities | — | — |
| Output modalities | — | — |
Shared benchmarks
Grok 4.1 Fast
Grok 4.20 0309
GPQA Diamond
85.3
88.5
Humanity’s Last Exam
17.6
30