GPT-5.4 Nano vs Kimi K2.7 Code
Pricing, context window and real answers (November 2026)
GPT-5.4 Nano (OpenAI) 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
 GPT-5.4 Nano |  Kimi K2.7 Code | |
|---|---|---|
| Provider | OpenAI | Moonshot |
| Input (per 1M tokens) | $0.211 | $0.3505 |
| Output (per 1M tokens) | $1.32 | $3.38 |
| Typical cost (1,000 in + 500 out tokens × 1,000 calls) | $0.8704 | $2.04 |
| Context window | 400,000 tokens | 262,144 tokens |
| Release date | 3/17/2026 | 6/12/2026 |
| Input modalities | file, image, text | text, image |
| Throughput (p50) | 114 tokens/s (n=27) | 106 tokens/s (n=27) |
| Arena · overall | #164 · ELO 1,401 | Unranked |
| Arena · Japanese | #117 · ELO 1,374 | Unranked |
| Arena · coding | #142 · ELO 1,460 | Unranked |
Prices are FastMetal's rates, before tax.
Rankings: LMArena leaderboard dataset (lmarena-ai/leaderboard-dataset), CC BY 4.0, snapshot 2026-10-28; category names mapped and ratings rounded by FastMetal.
Which should you pick?
- On price, GPT-5.4 Nano: $1.32 per 1M output tokens, 61% less than Kimi K2.7 Code.
- For long documents, GPT-5.4 Nano: a 400,000-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, GPT-5.4 Nano or Kimi K2.7 Code?
- Per 1M output tokens, GPT-5.4 Nano is $1.32 and Kimi K2.7 Code is $3.38 on FastMetal (US dollars, before tax), so GPT-5.4 Nano is cheaper.
- How do the context windows of GPT-5.4 Nano and Kimi K2.7 Code compare?
- GPT-5.4 Nano takes 400,000 tokens; Kimi K2.7 Code takes 262,144.
- Can I use GPT-5.4 Nano and Kimi K2.7 Code with the same API key?
- Yes. On FastMetal's OpenAI-compatible endpoint, switch by passing "gpt-5.4-nano" 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 GPT-5.4 Nano and Kimi K2.7 Code from the browser chat and the API. No monthly fee.