xAI: Grok 4 Fast vs Auto Router
Side-by-side comparison based on OpenRouter API data.
Key Differences
- •Auto Router is -0.0x cheaper than xAI: Grok 4 Fast for input tokens
| Spec | xAI: Grok 4 Fast | Auto Router |
|---|---|---|
| Provider | xAI | OpenRouter |
| Context Length | 2M | 2M |
| Max Output | 30K | N/A |
| Input Price/1M | $0.20 | <$0.01 |
| Output Price/1M | $0.50 | <$0.01 |
| Cache Read/1M | $0.05 | Free |
| Cache Write/1M | Free | Free |
| Input Modalities | Text + Image | Text + Image + Audio + File + Video |
| Output Modalities | Text | Text + Image |
| Tokenizer | Grok | Router |
| Moderated | No | No |