Model comparison
Grok 4.1 Fast vs Grok 4 Fast
xAI (Grok)Grok 4.1 Fast
- Input
- $0.20 / 1M tokens
- Output
- $0.50 / 1M tokens
- Context
- 2M
- Released
- 2025-11-19
- Input
- $0.20 / 1M tokens
- Output
- $0.50 / 1M tokens
- Context
- 2M
- Released
- 2025-09
Short answer
Both charge the same $0.2 per 1M input tokens.
Specs and pricing side by side
| Spec | Grok 4.1 Fast | Grok 4 Fast |
|---|---|---|
| Maker | xAI (Grok) | xAI (Grok)same |
| Released | 2025-11-19 | 2025-09 |
| Context window | 2M | 2Msame |
| Input price | $0.20 / 1M tokens | $0.20 / 1M tokenssame |
| Output price | $0.50 / 1M tokens | $0.50 / 1M tokenssame |
| Parameters | not published | Undisclosed |
| License | Proprietary | Proprietarysame |
| Weights | API only | API onlysame |
| Modalities | Text, Vision | Text, Visionsame |
| Knowledge cutoff | not published | Not publicly disclosed |
Not published by either maker: max output.
Benchmarks both models report
These two models have no benchmark in common in our registry, so there is no like-for-like score to compare. See each model’s own results: Grok 4.1 Fast, Grok 4 Fast.
Which one should you pick?
Pick Grok 4.1 Fast if…
- Your use case is: customer-support and helpdesk agents that chain many tool calls.
Pick Grok 4 Fast if…
- Your use case is: high-volume production tasks where cost per answer is the deciding factor.
FAQ
Which is better, Grok 4.1 Fast or Grok 4 Fast?
Both charge the same $0.2 per 1M input tokens. The better pick depends on whether you value benchmark scores, price per token, context length or openness for your workload.
How do Grok 4.1 Fast and Grok 4 Fast pricing compare?
Grok 4.1 Fast: $0.20 / 1M tokens input, $0.50 / 1M tokens output. Grok 4 Fast: $0.20 / 1M tokens input, $0.50 / 1M tokens output (list API prices as published by each maker).
What are the context windows of Grok 4.1 Fast and Grok 4 Fast?
Grok 4.1 Fast offers 2M; Grok 4 Fast offers 2M.
Is Grok 4.1 Fast newer than Grok 4 Fast?
Grok 4.1 Fast was released 2025-11-19; Grok 4 Fast was released 2025-09.