xAI: Grok 4 Fast vs OpenAI: GPT-5.4
Side-by-side comparison based on OpenRouter API data.
Key Differences
- •xAI: Grok 4 Fast is 12.5x cheaper than OpenAI: GPT-5.4 for input tokens
- •xAI: Grok 4 Fast has 1.9x more context than OpenAI: GPT-5.4 (2M vs 1.1M)
| Spec | xAI: Grok 4 Fast | OpenAI: GPT-5.4 |
|---|---|---|
| Provider | xAI | OpenAI |
| Context Length | 2M | 1.1M |
| Max Output | 30K | 128K |
| Input Price/1M | $0.20 | $2.50 |
| Output Price/1M | $0.50 | $15 |
| Cache Read/1M | $0.05 | $0.25 |
| Cache Write/1M | Free | Free |
| Input Modalities | Text + Image | Text + Image + File |
| Output Modalities | Text | Text |
| Tokenizer | Grok | GPT |
| Moderated | No | Yes |