Grok 4 Fast (Reasoning) is a text-based AI model by xAI. It features 128 tok/s output speed, $0.20/1M input tokens pricing. It scores 35.1 on the intelligence index.
Output Speed
128 tok/s
Latency (TTFT)
3.57s
Blended Price
$0.28/M
| Input (Prompt) | $0.20 |
| Output (Completion) | $0.50 |
| Cache Read | Free |
| Cache Write | Free |
| Context Length | N/A |
| Max Output Tokens | N/A |
| Input Modalities | Text |
| Output Modalities | Text |
| Tokenizer | N/A |
Grok 4 Fast (Reasoning) costs $0.20/1M input tokens and $0.50/1M output tokens.
Grok 4 Fast (Reasoning) has a moderate coding score of 27.4. It can handle basic programming tasks but may not be the best for complex coding.
Grok 4 Fast (Reasoning) generates output at 128 tok/s. Time to first token is 3.57s.
No, Grok 4 Fast (Reasoning) is a paid model. Check the free models page for zero-cost alternatives.
Last updated:
See the alternatives section above for models with similar capabilities. You can also compare Grok 4 Fast (Reasoning) head-to-head with any model on our comparison page.