Grok 4.1 Fast Reasoning vs Kimi K2.5
Grok 4.1 Fast Reasoning is cheaper on output tokens, while Grok 4.1 Fast Reasoning offers a larger context window. Choose Grok 4.1 Fast Reasoning or Kimi K2.5 based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Grok 4.1 Fast Reasoning | Kimi K2.5 |
|---|---|---|
| Provider | Vercel AI Gateway | Vercel AI Gateway |
| Input / 1M tokens | $0.20 | $0.60 |
| Output / 1M tokens | $0.50 | $3.00 |
| Context window | 1M | 262K |
| Parameters | — | 1T |
| Open weights | No | Yes |
| Released | Nov 2025 | Jan 2026 |
FAQ
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.