xAI: Grok 4 Fast vs xAI: Grok 4.20 Beta
Side-by-side comparison based on OpenRouter API data.
Key Differences
- •xAI: Grok 4 Fast is 10.0x cheaper than xAI: Grok 4.20 Beta for input tokens
| Spec | xAI: Grok 4 Fast | xAI: Grok 4.20 Beta |
|---|---|---|
| Provider | xAI | xAI |
| Context Length | 2M | 2M |
| Max Output | 30K | N/A |
| Input Price/1M | $0.20 | $2.00 |
| Output Price/1M | $0.50 | $6.00 |
| Cache Read/1M | $0.05 | $0.20 |
| Cache Write/1M | Free | Free |
| Input Modalities | Text + Image | Text + Image |
| Output Modalities | Text | Text |
| Tokenizer | Grok | Grok |
| Moderated | No | No |