Claude Sonnet 5.5 vs Kimi K3.1 Pro
Both have similar output pricing, while Kimi K3.1 Pro offers a larger context window. Choose Claude Sonnet 5.5 or Kimi K3.1 Pro based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Claude Sonnet 5.5 | Kimi K3.1 Pro |
|---|---|---|
| Provider | Anthropic | MoonshotAI |
| Input / 1M tokens | $2.00 | $2.00 |
| Output / 1M tokens | $10.00 | $10.00 |
| Context window | 1M | 1M |
| Parameters | — | — |
| Open weights | — | — |
| Released | — | — |
| LMArena (Chatbot Arena) Elo score | 1473 | — |
| GPQA Diamond score | 95.6 | — |
| Epoch Capabilities Index score | 166 | — |
| LMArena WebDev Elo score | 1768 | — |
| LMArena Vision Elo score | 1287 | — |
FAQ
Is Claude Sonnet 5.5 or Kimi K3.1 Pro cheaper?
Claude Sonnet 5.5 and Kimi K3.1 Pro have comparable output pricing.
Which has the larger context window, Claude Sonnet 5.5 or Kimi K3.1 Pro?
Kimi K3.1 Pro 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.