Kimi K2 Thinking vs Grok 4.20 (Reasoning)
Both have similar output pricing, while Grok 4.20 (Reasoning) offers a larger context window. Choose Kimi K2 Thinking 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 Thinking | Grok 4.20 (Reasoning) |
|---|---|---|
| Provider | MoonshotAI | xAI |
| Input / 1M tokens | $0.60 | $1.25 |
| Output / 1M tokens | $2.50 | $2.50 |
| Context window | 262K | 1M |
| Parameters | 1T | — |
| Open weights | Yes | No |
| Released | Nov 2025 | Mar 2026 |
| LiveBench score | 62.3 | 69.0 |
| Aider Polyglot score | 59.1 | — |
FAQ
Is Kimi K2 Thinking or Grok 4.20 (Reasoning) cheaper?
Kimi K2 Thinking and Grok 4.20 (Reasoning) have comparable output pricing.
Which has the larger context window, Kimi K2 Thinking 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.