xAI: Grok 4 Fast vs Google: Gemini 2.5 Flash
Side-by-side comparison based on OpenRouter API data.
Key Differences
- •xAI: Grok 4 Fast is 1.5x cheaper than Google: Gemini 2.5 Flash for input tokens
- •xAI: Grok 4 Fast has 1.9x more context than Google: Gemini 2.5 Flash (2M vs 1.0M)
| Spec | xAI: Grok 4 Fast | Google: Gemini 2.5 Flash |
|---|---|---|
| Provider | xAI | |
| Context Length | 2M | 1.0M |
| Max Output | 30K | 66K |
| Input Price/1M | $0.20 | $0.30 |
| Output Price/1M | $0.50 | $2.50 |
| Cache Read/1M | $0.05 | $0.03 |
| Cache Write/1M | Free | $0.08 |
| Input Modalities | Text + Image | File + Image + Text + Audio + Video |
| Output Modalities | Text | Text |
| Tokenizer | Grok | Gemini |
| Moderated | No | No |