Kimi K3 vs Claude 4 Sonnet
Claude 4 Sonnet is cheaper on output tokens, while Kimi K3 offers a larger context window. Choose Kimi K3 or Claude 4 Sonnet based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Kimi K3 | Claude 4 Sonnet |
|---|---|---|
| Provider | MoonshotAI | NanoGPT |
| Input / 1M tokens | $0.45 | $2.99 |
| Output / 1M tokens | $15.00 | $14.99 |
| Context window | 1M | 200K |
| Parameters | — | — |
| Open weights | — | No |
| Released | — | Sep 2025 |
| LMArena (Chatbot Arena) Elo score | 1476 | — |
| LMArena WebDev Elo score | 1655 | — |
| Epoch Capabilities Index score | 157 | — |
| GPQA Diamond score | 93.1 | — |
| LiveBench score | — | 60.6 |
| SWE-bench Verified score | — | 76.4 |
| SWE-bench Multimodal score | — | 35.6 |
FAQ
Is Kimi K3 or Claude 4 Sonnet cheaper?
Claude 4 Sonnet is cheaper on output tokens ($14.99 vs $15.00 per 1M).
Which has the larger context window, Kimi K3 or Claude 4 Sonnet?
Kimi K3 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.