xAI/Grok 4/Nov 19, 2025
Grok 4.1 Fast
xAI's latest and most cost-efficient model. Supports a massive 2M-token context window and delivers near-frontier capability (Intelligence Index 24) at just $0.20/$0.50 per million tokens. Available in both fast-response and thinking modes. The cheapest available frontier AI model option.
textcodereasoningvisiontool-use
Arena ELO
1,430
Input Price
$0.2/M
Output Price
$0.5/M
Speed
126 t/s
Context
2M
Latency
620ms
Capability Assessment
No benchmark data available.
Comparative Analysis
| Metric | Grok 4.1 Fast | Claude Opus 4.6 | Gemini 3.1 Pro | Grok 4 |
|---|---|---|---|---|
| SWE-bench | — | 80.8% | 80.6% | 72.0% |
| AIME 2025 | — | 100.0% | 91.2% | 94.0% |
| GPQA Diamond | — | 91.3% | 94.3% | 88.0% |
| MMLU | — | 91.0% | 92.6% | — |
| Input $/M | $0.2 | $5 | $2 | $3 |
| Output $/M | $0.5 | $25 | $12 | $15 |