$ diff kimi-k2-8-preview hy4-preview
Kimi K2.8 Preview vs Hy4 preview
Values come from Kimi K2.8 Preview and Hy4 preview, where each is cited to its source. This page states no benchmark result and ranks neither model — it puts two published specifications next to each other. Where a lab has not published a figure, the row says so rather than guessing.
Moonshot AIKimi K2.8 Preview
- context
- 1M
- weights
- closed
- $/M in
- —
- $/M out
- —
- context
- 1M
- weights
- open
- $/M in
- $0.834
- $/M out
- $2.501
What actually differs
- Context window
- Identical — both accept 1M tokens, so context length is not a reason to pick either.
- Weights
- Hy4 preview publishes weights (Apache-2.0); Kimi K2.8 Preview is API-only. That decides self-hosting, air-gapped deployment and fine-tuning before any capability question does.
- Recency
- Kimi K2.8 Preview shipped 14 days after Hy4 preview (2026-09-11 vs 2026-08-28).
Full spec
| Attribute | Kimi K2.8 Preview | Hy4 preview |
|---|---|---|
| Developer | Moonshot AI | Tencent |
| Released | 2026-09-11 | 2026-08-28 |
| Context window | 1,000,000 | over 1,000,000 |
| Pricing | not recorded | $0.834/M input · $2.501/M output |
| License | proprietary | Apache-2.0 |
| Availability | Kimi API platform, Kimi Code, Kimi Work | Hugging Face (BF16 + FP8), ModelScope, GitCode, CNB, Tencent Cloud TokenHub, OpenRouter, WorkBuddy, CodeBuddy, Yuanbao, ima |