Kimi K2.5 vs Grok 4.20 (Reasoning)
Both have similar output pricing, while Grok 4.20 (Reasoning) offers a larger context window. Choose Kimi K2.5 or Grok 4.20 (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 (Reasoning) |
|---|---|---|
| Provider | MoonshotAI | xAI |
| Input / 1M tokens | $0.50 | $1.25 |
| Output / 1M tokens | $2.50 | $2.50 |
| Context window | 262K | 1M |
| Parameters | 1T | — |
| Open weights | Yes | No |
| Released | Jan 2026 | Mar 2026 |
| LiveBench score | 69.2 | 69.0 |
| SWE-bench Verified score | 70.8 | — |
| SWE-bench Multilingual score | 67.3 | — |
| LMArena (Chatbot Arena) Elo score | 1445 | — |
| LMArena WebDev Elo score | 1436 | — |
| LMArena Vision Elo score | 1269 | — |
| Epoch Capabilities Index score | 148 | — |
FAQ
Is Kimi K2.5 or Grok 4.20 (Reasoning) cheaper?
Kimi K2.5 and Grok 4.20 (Reasoning) have comparable output pricing.
Which has the larger context window, Kimi K2.5 or Grok 4.20 (Reasoning)?
Grok 4.20 (Reasoning) has the larger context window (1M tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.