xAI: Grok 4 Fast vs xAI: Grok 4.1 Fast
Side-by-side comparison based on OpenRouter API data.
| Spec | xAI: Grok 4 Fast | xAI: Grok 4.1 Fast |
|---|---|---|
| Provider | xAI | xAI |
| Context Length | 2M | 2M |
| Max Output | 30K | 30K |
| Input Price/1M | $0.20 | $0.20 |
| Output Price/1M | $0.50 | $0.50 |
| Cache Read/1M | $0.05 | $0.05 |
| Cache Write/1M | Free | Free |
| Input Modalities | Text + Image | Text + Image |
| Output Modalities | Text | Text |
| Tokenizer | Grok | Grok |
| Moderated | No | No |