Ember-1 vs Kimi K2.7 Code
Pricing, context window and real answers (September 2026)
Ember-1 (Fireworks) and Kimi K2.7 Code (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
| Ember-1 |  Kimi K2.7 Code | |
|---|---|---|
| Provider | Fireworks | Moonshot |
| Input (per 1M tokens) | ¥536.1 | ¥55 |
| Output (per 1M tokens) | ¥2,680.5 | ¥530 |
| Typical cost (1,000 in + 500 out tokens × 1,000 calls) | ¥1,876 | ¥320 |
| Context window | 1,048,576 tokens | 262,144 tokens |
| Release date | 9/24/2026 | 6/12/2026 |
| Input modalities | text, image | text, image |
| Throughput (p50) | — | — |
| Arena · overall | Unranked | Unranked |
| Arena · Japanese | Unranked | Unranked |
| Arena · coding | Unranked | Unranked |
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 Ember-1.
- For long documents, Ember-1: 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, Ember-1 or Kimi K2.7 Code?
- Per 1M output tokens, Ember-1 is ¥2,680.5 and Kimi K2.7 Code is ¥530 on FastMetal (yen, before tax), so Kimi K2.7 Code is cheaper.
- How do the context windows of Ember-1 and Kimi K2.7 Code compare?
- Ember-1 takes 1,048,576 tokens; Kimi K2.7 Code takes 262,144.
- Can I use Ember-1 and Kimi K2.7 Code with the same API key?
- Yes. On FastMetal's OpenAI-compatible endpoint, switch by passing "ember-1" or "japan-kimi-k2.7-code" 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 Ember-1 and Kimi K2.7 Code from the browser chat and the API. No monthly fee.