Claude Sonnet 5.5 vs Kimi K3.1 Pro (Moonshot AI)
Both have similar output pricing, while Kimi K3.1 Pro (Moonshot AI) offers a larger context window. Choose Claude Sonnet 5.5 or Kimi K3.1 Pro (Moonshot AI) 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 (Moonshot AI) |
|---|---|---|
| Provider | Anthropic | LLM Gateway |
| Input / 1M tokens | $2.00 | $2.00 |
| Output / 1M tokens | $10.00 | $10.00 |
| Context window | 1M | 1M |
| Parameters | — | — |
| Open weights | — | No |
| Released | — | Oct 2026 |
| 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 (Moonshot AI) cheaper?
Claude Sonnet 5.5 and Kimi K3.1 Pro (Moonshot AI) have comparable output pricing.
Which has the larger context window, Claude Sonnet 5.5 or Kimi K3.1 Pro (Moonshot AI)?
Kimi K3.1 Pro (Moonshot AI) 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.