Kimi K2.7 Code vs Kimi K3
Pricing, context window and real answers (August 2026)
Kimi K2.7 Code (Moonshot) and Kimi K3 (Moonshot), compared as you can actually call them on FastMetal. Both are served from the same OpenAI-compatible endpoint and API key; switching is a change to the model string.
Specs and pricing
 Kimi K2.7 Code | Kimi K3 | |
|---|---|---|
| Provider | Moonshot | Moonshot |
| Input (per 1M tokens) | ¥55 | ¥536.1 |
| Output (per 1M tokens) | ¥530 | ¥2,680.5 |
| Typical cost (1,000 in + 500 out tokens × 1,000 calls) | ¥320 | ¥1,876 |
| Context window | 262,144 tokens | 1,048,576 tokens |
| Release date | 6/12/2026 | 7/16/2026 |
| Input modalities | text, image | text, image |
| Arena · overall | Unranked | #10 · ELO 1,489 |
| Arena · Japanese | Unranked | #4 · ELO 1,510 |
| Arena · coding | Unranked | #6 · ELO 1,543 |
Prices are FastMetal's yen rates before tax. Arena ranks are as of the latest leaderboard scrape.
Which should you pick?
- On price, Kimi K2.7 Code: ¥530 per 1M output tokens, 80% less than Kimi K3.
- For long documents, Kimi K3: a 1,048,576-token context window against 262,144 for Kimi K2.7 Code.
- If in doubt, try both on the same key. Switching is a change to the model string, and each is billed at its own rate.
Frequently asked questions
- Which is cheaper, Kimi K2.7 Code or Kimi K3?
- Per 1M output tokens, Kimi K2.7 Code is ¥530 and Kimi K3 is ¥2,680.5 on FastMetal (yen, before tax), so Kimi K2.7 Code is cheaper.
- How do the context windows of Kimi K2.7 Code and Kimi K3 compare?
- Kimi K2.7 Code takes 262,144 tokens; Kimi K3 takes 1,048,576.
- Can I use Kimi K2.7 Code and Kimi K3 with the same API key?
- Yes. On FastMetal's OpenAI-compatible endpoint, switch by passing "japan-kimi-k2.7-code" or "kimi-k3" as the model. Each is billed at its own rate from the same prepaid balance.
Try both on one API key
Create an account and add credit to call Kimi K2.7 Code and Kimi K3 from the browser chat and the API. No monthly fee.