Claude Opus 4.8 vs Kimi K3.1 Pro Highspeed (Moonshot AI)
Kimi K3.1 Pro Highspeed (Moonshot AI) is cheaper on output tokens, while Kimi K3.1 Pro Highspeed (Moonshot AI) offers a larger context window. Choose Claude Opus 4.8 or Kimi K3.1 Pro Highspeed (Moonshot AI) based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Claude Opus 4.8 | Kimi K3.1 Pro Highspeed (Moonshot AI) |
|---|---|---|
| Provider | Anthropic | LLM Gateway |
| Input / 1M tokens | $5.00 | $4.00 |
| Output / 1M tokens | $25.00 | $20.00 |
| Context window | 1M | 1M |
| Parameters | — | — |
| Open weights | — | No |
| Released | — | Oct 2026 |
| LMArena (Chatbot Arena) Elo score | 1461 | — |
| GPQA Diamond score | 91.0 | — |
| FrontierMath score | 47.2 | — |
| Epoch Capabilities Index score | 159 | — |
| LMArena WebDev Elo score | 1556 | — |
| LMArena Vision Elo score | 1294 | — |
FAQ
Is Claude Opus 4.8 or Kimi K3.1 Pro Highspeed (Moonshot AI) cheaper?
Kimi K3.1 Pro Highspeed (Moonshot AI) is cheaper on output tokens ($20.00 vs $25.00 per 1M).
Which has the larger context window, Claude Opus 4.8 or Kimi K3.1 Pro Highspeed (Moonshot AI)?
Kimi K3.1 Pro Highspeed (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.