Claude Sonnet 4 vs Kimi K3
Both have similar output pricing, while Kimi K3 offers a larger context window. Choose Claude Sonnet 4 or Kimi K3 based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Claude Sonnet 4 | Kimi K3 |
|---|---|---|
| Provider | Anthropic | MoonshotAI |
| Input / 1M tokens | $3.00 | $0.45 |
| Output / 1M tokens | $15.00 | $15.00 |
| Context window | 200K | 1M |
| Parameters | — | — |
| Open weights | No | — |
| Released | May 2025 | — |
| SWE-bench Verified score | 76.8 | — |
| Aider Polyglot score | 61.3 | — |
| LMArena (Chatbot Arena) Elo score | 1351 | 1476 |
| LMArena Vision Elo score | 1191 | — |
| GPQA Diamond score | 78.3 | 93.1 |
| FrontierMath score | 4.1 | — |
| Epoch Capabilities Index score | 142 | 157 |
| LMArena WebDev Elo score | — | 1655 |
FAQ
Is Claude Sonnet 4 or Kimi K3 cheaper?
Claude Sonnet 4 and Kimi K3 have comparable output pricing.
Which has the larger context window, Claude Sonnet 4 or Kimi K3?
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.