Grok 4 Fast vs Kimi K2.5
Grok 4 Fast is cheaper on output tokens, while Grok 4 Fast offers a larger context window. Choose Grok 4 Fast or Kimi K2.5 based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Grok 4 Fast | Kimi K2.5 |
|---|---|---|
| Provider | ZenMux | ZenMux |
| Input / 1M tokens | $0.20 | $0.58 |
| Output / 1M tokens | $0.50 | $3.02 |
| Context window | 2M | 262K |
| Parameters | — | 1T |
| Open weights | No | No |
| Released | Sep 2025 | Jan 2026 |
FAQ
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.