Grok 4 Fast
by xAI · grok family · released 2025-09-19
On output pricing, Grok 4 Fast is cheaper than 461 of the 588 priced models tracked here, at $0.5/Mtok. Its 2,000,000-token context window is larger than 673 of 674 models. Capabilities: vision, tools, reasoning.
Specifications
| Provider | xAI |
| Family | grok |
| Input price | $0.2/Mtok |
| Output price | $0.5/Mtok |
| Cache read price | $0.05/Mtok |
| Context window | 2,000,000 |
| Max output tokens | 30,000 |
| Input modalities | text, image |
| Output modalities | text |
| Capabilities | vision, tools, reasoning |
| Knowledge cutoff | 2025-07-01 |
| Released | 2025-09-19 |
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