Grok 3 Mini vs Grok 4 Fast
Both have similar output pricing, while Grok 4 Fast offers a larger context window. Choose Grok 3 Mini or Grok 4 Fast based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Grok 3 Mini | Grok 4 Fast |
|---|---|---|
| Provider | Poe | ZenMux |
| Input / 1M tokens | $0.30 | $0.20 |
| Output / 1M tokens | $0.50 | $0.50 |
| Context window | 131K | 2M |
| Parameters | — | — |
| Open weights | No | No |
| Released | Apr 2025 | Sep 2025 |
| Aider Polyglot score | 49.3 | — |
| Epoch Capabilities Index score | 140 | 144 |
| LMArena (Chatbot Arena) Elo score | 1370 | 1400 |
| LMArena WebDev Elo score | — | 1159 |
FAQ
Is Grok 3 Mini or Grok 4 Fast cheaper?
Grok 3 Mini and Grok 4 Fast have comparable output pricing.
Which has the larger context window, Grok 3 Mini or Grok 4 Fast?
Grok 4 Fast has the larger context window (2M tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.