Model Library
xAIReleased November 19, 2025Grok 4.1 Fast
xAI · Released November 19, 2025
Intelligence score
31
At a glance
- Intelligence
- 31
- Speed
- —
- Latency
- —
- Input price
- Not published
- Output price
- Not published
- Context window
- 4tokens
- Parameters
- —
Summary
Comparison summary
Grok 4.1 Fast (Reasoning) scores 31 (estimated) on the Artificial Analysis Intelligence Index, placing it well above average among other reasoning models in a similar price tier (median: 14).
Specifications
Technical specifications
| Model name | Grok 4.1 Fast |
|---|---|
| Provider | xAI |
| Release date | November 19, 2025 |
| Intelligence score | 31 |
| Speed | — |
| Latency (TTFT) | — |
| Input price | Not published |
| Output price | Not published |
| Context window | 4 tokens |
| Parameters | — |
| Reasoning | Yes |
| Input modalities | text, image |
| Output modalities | — |
| Open weights | No |
| License | — |
| API availability | — |
| Source | Model Intelligence legacy profile: grok-4-1-fast-reasoning |
FAQ · 14
Frequently asked questions
Grok 4.1 Fast (Reasoning) was released on November 19, 2025.
Grok 4.1 Fast (Reasoning) was created by xAI.
Grok 4.1 Fast (Reasoning) scores 31 (estimated) on the Artificial Analysis Intelligence Index, placing it well above average among other reasoning models in a similar price tier (median: 14).
Yes, Grok 4.1 Fast (Reasoning) is a reasoning model. It uses extended thinking or chain-of-thought reasoning to work through complex problems before providing an answer.
Grok 4.1 Fast (Reasoning) supports text and image input.
Grok 4.1 Fast (Reasoning) supports text output.
Yes, Grok 4.1 Fast (Reasoning) supports image input and can analyze, describe, and answer questions about images.
Yes, Grok 4.1 Fast (Reasoning) is multimodal. It can process text and image input and generate text output.
Grok 4.1 Fast (Reasoning) has a context window of 2.0M tokens. This determines how much text and conversation history the model can process in a single request.
No, Grok 4.1 Fast (Reasoning) is proprietary. The model weights are not publicly available.
Grok 4.1 Fast (Reasoning) is a proprietary model and xAI has not disclosed the model size or parameter count.
Grok 4.1 Fast (Reasoning) achieves a score of 31 on the Artificial Analysis Intelligence Index. This composite benchmark evaluates models across reasoning, knowledge, mathematics, and coding.
Check the providers page for current API availability.
Visit the providers page to see availability.