$ diff kimi-k3-1-pro hy4-preview
Kimi K3.1 Pro vs Hy4 preview
Values come from Kimi K3.1 Pro 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 K3.1 Pro
- context
- 1.0M
- weights
- —
- $/M in
- $2
- $/M out
- $10
- context
- 1M
- weights
- open
- $/M in
- $0.834
- $/M out
- $2.501
What actually differs
- Context window
- Kimi K3.1 Pro takes 1.0M against 1M — modestly more room in a single request.
- Input price
- Hy4 preview at $0.834/M against $2/M — 2.4× cheaper to feed. Standard rates: one of these labs also quotes a lower cached-input tier, which applies only when a prefix is reused — see the full spec below.
- Output price
- Hy4 preview at $2.501/M against $10/M — 4.0× cheaper to generate. Output dominates the bill on most agentic workloads, where the model writes far more than it reads.
- Recency
- Kimi K3.1 Pro shipped 56 days after Hy4 preview (2026-10-23 vs 2026-08-28).
Full spec
| Attribute | Kimi K3.1 Pro | Hy4 preview |
|---|---|---|
| Developer | Moonshot AI | Tencent |
| Released | 2026-10-23 | 2026-08-28 |
| Context window | 1,048,576 tokens ([source](../../sources/blogs/moonshot-2026-10-24-k3-pricing.md)) | over 1,000,000 |
| Pricing | $2.00/MTok input · $10.00/MTok output · $0.20/MTok cached input; cache writes $2.00/MTok (5m), $4.00/MTok (1h); excludes taxes ([source](../../sources/blogs/moonshot-2026-10-24-k3-pricing.md)) | $0.834/M input · $2.501/M output |
| License | not recorded | Apache-2.0 |
| Availability | Kimi.ai, mobile apps, Kimi Work, Kimi Code, Kimi API; enterprise access off by default at launch ([source](../../sources/blogs/moonshot-2026-10-23-kimi-k3-1-pro.md)) | Hugging Face (BF16 + FP8), ModelScope, GitCode, CNB, Tencent Cloud TokenHub, OpenRouter, WorkBuddy, CodeBuddy, Yuanbao, ima |