Claude Sonnet 5.5 vs Kimi K3 Spot
Claude Sonnet 5.5 is cheaper on output tokens, while Kimi K3 Spot offers a larger context window. Choose Claude Sonnet 5.5 or Kimi K3 Spot based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Claude Sonnet 5.5 | Kimi K3 Spot |
|---|---|---|
| Provider | Anthropic | Fireworks AI |
| Input / 1M tokens | $2.00 | $2.10 |
| Output / 1M tokens | $10.00 | $10.50 |
| Context window | 1M | 1M |
| Parameters | — | — |
| Open weights | — | Yes |
| Released | — | Jul 2026 |
| LMArena (Chatbot Arena) Elo score | 1473 | — |
| GPQA Diamond score | 95.6 | — |
| LMArena WebDev Elo score | 1768 | — |
| LMArena Vision Elo score | 1287 | — |
| Epoch Capabilities Index score | 166 | — |
FAQ
Is Claude Sonnet 5.5 or Kimi K3 Spot cheaper?
Claude Sonnet 5.5 is cheaper on output tokens ($10.00 vs $10.50 per 1M).
Which has the larger context window, Claude Sonnet 5.5 or Kimi K3 Spot?
Kimi K3 Spot 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.