Grok 4.1 Fast vs Grok 4 Fast
Both have similar output pricing. Choose Grok 4.1 Fast or Grok 4 Fast based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Grok 4.1 Fast | Grok 4 Fast |
|---|---|---|
| Provider | Ofox | ZenMux |
| Input / 1M tokens | $0.20 | $0.20 |
| Output / 1M tokens | $0.50 | $0.50 |
| Context window | 2M | 2M |
| Parameters | — | — |
| Open weights | No | No |
| Released | Nov 2025 | Sep 2025 |
| LiveBench score | 60.1 | — |
| LMArena (Chatbot Arena) Elo score | 1408 | 1400 |
| LMArena WebDev Elo score | 1242 | 1159 |
| LMArena Vision Elo score | 1201 | — |
| Epoch Capabilities Index score | — | 144 |
FAQ
Is Grok 4.1 Fast or Grok 4 Fast cheaper?
Grok 4.1 Fast and Grok 4 Fast have comparable output pricing.
Which has the larger context window, Grok 4.1 Fast or Grok 4 Fast?
Both models offer a similar context window.
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.