// Tencent Hunyuan / Hy · Text LLM
Hy4-preview: VRAM & local deployment
770B total · 49B active (MoE) parameters. About 515 GB at 4-bit and 1.70 TB at BF16 with one 8K-token request.
released 2026-08-27licence: Commercial OKmemory figures are estimates
01Specs
| Publisher | Tencent · tencent |
|---|---|
| Family / series | Tencent Hunyuan / Hy · Hy4-preview |
| Type | Text LLM (text-generation) |
| Parameters | 770B total · 49B active (MoE) Source: official model card“770B total parameters, of which 49B are activated per token” |
| Context length | 1M tokens (1,048,576)max_position_embeddings in config.json |
| Architecture | 78 layers · MLA · MoE |
| Released weights | BF16 · 1.56 TBdownload |
| Licence | Apache-2.0 · Commercial OKPermissive licence (Apache-2.0 / MIT / CC-BY / OpenMDW): commercial use allowed. |
| Released | 2026-08-27 (Hugging Face repo created) |
02How much VRAM it needs (estimate)
Total = weights + 10% + 0.5GB overhead + KV cache for one request (FP16 KV). More concurrent users multiply the KV column.
| Precision | Weights | Total @ 8K | Total @ 32K | Total @ 128K | Smallest GPU | Mac |
|---|---|---|---|---|---|---|
| BF16 / FP16 (original) | 1.54 TB | 1.70 TB | 1.70 TB | 1.71 TB | 8 × B300 (2,304GB) | — |
| FP8 / INT8 / Q8_0 | 818 GB | 901 GB | 903 GB | 912 GB | 8 × H200 (1,128GB) | — |
| 4-bit (Q4_K_M / AWQ / GPTQ-Int4) | 467 GB | 515 GB | 517 GB | 526 GB | 8 × H100 (640GB) | — |
KV cache per request: 8K 0.7 GB · 32K 2.9 GB · 128K 11.8 GB
Bits per weight: BF16 16, FP8 8.5, 4-bit 4.85. “Fits” = total ≤ 90% of memory; Mac GPU can use ~2/3 of unified memory (≤36GB) or ~3/4 (larger). For MoE, all experts must be in memory, so size by total parameters. Method →
03How to run it
Only runtimes the publisher or the runtime’s official library names for this model.
- vLLM — mentioned in the official model card
- SGLang — mentioned in the official model card
- Transformers — mentioned in the official model card
04Official repositories & quantised builds
2 official repo(s) from tencent.
- Hy4-preview main
- Hy4-preview-FP8 FP8
05Other Tencent Hunyuan / Hy models
All 19 →| Model | Params | 4-bit total | Released |
|---|---|---|---|
| Hy-Memory-30B-A3B | 30.1B / 3B | 21.4 GB | 2026-10-15 |
| Hy3 | 295B / 21B | 200 GB | 2026-07-02 |
| Hy-MT2-1.8B | 2.04B | 2.4 GB | 2026-05-11 |
| Hy-MT2-7B | 8.03B | 6.9 GB | 2026-05-11 |
| Hy-MT2-30B-A3B | 30.1B / 3B | 21.4 GB | 2026-05-11 |
| Hy3-preview | 295B / 21B | 200 GB | 2026-04-13 |
| HY-MT1.5-1.8B | 2.04B | 2.4 GB | 2025-12-25 |
| HunyuanOCR | 1.12B | 2.1 GB | 2025-11-18 |
06Sources
Data checked 2026-08-28. Parameters, context and licence are copied from the official repository; memory figures are our estimates.