Kimi K2.5 vs Grok 4.20 Beta Reasoning
Both have similar output pricing, while Grok 4.20 Beta Reasoning offers a larger context window. Choose Kimi K2.5 or Grok 4.20 Beta Reasoning based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Kimi K2.5 | Grok 4.20 Beta Reasoning |
|---|---|---|
| Provider | MoonshotAI | Vercel AI Gateway |
| Input / 1M tokens | $0.50 | $1.25 |
| Output / 1M tokens | $2.50 | $2.50 |
| Context window | 262K | 2M |
| Parameters | 1T | — |
| Open weights | Yes | No |
| Released | Jan 2026 | Mar 2026 |
| LiveBench score | 69.2 | — |
| SWE-bench Multilingual score | 67.3 | — |
| SWE-bench Verified score | 70.8 | — |
| Epoch Capabilities Index score | 148 | — |
| LMArena (Chatbot Arena) Elo score | 1445 | — |
| LMArena WebDev Elo score | 1436 | — |
| LMArena Vision Elo score | 1269 | — |
FAQ
Is Kimi K2.5 or Grok 4.20 Beta Reasoning cheaper?
Kimi K2.5 and Grok 4.20 Beta Reasoning have comparable output pricing.
Which has the larger context window, Kimi K2.5 or Grok 4.20 Beta Reasoning?
Grok 4.20 Beta Reasoning 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.