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• Model Introduction
• Highlights
• Benchmark Results
  • STEM & Reasoning
  • Context Learning & Instruction Following
  • Code & Agent
• News
• Model Links
• Quickstart
• Deployment
  • vLLM
  • SGLang
• Training
• Quantization
• License
• Contact Us

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Hy3 preview is a 295B-parameter Mixture-of-Experts (MoE) model with 21B active parameters and 3.8B MTP layer parameters, developed by the Tencent Hy Team. Hy3 preview is the first model trained on our rebuilt infrastructure, and the strongest we've shipped so far. It improves significantly on complex reasoning, instruction following, context learning, coding, and agent tasks.

Property	Value
Architecture	Mixture-of-Experts (MoE)
Total Parameters	295B
Activated Parameters	21B
MTP Layer Parameters	3.8B
Number of Layers (excluding MTP layer)	80
Number of MTP Layers	1
Attention Heads	64 (GQA, 8 KV heads, head dim 128)
Hidden Size	4096
Intermediate Size	13312
Context Length	256K
Vocabulary Size	120832
Number of Experts	192 experts, top-8 activated
Supported Precisions	BF16

• STEM & Reasoning — Complex reasoning underpins everything else. Hy3 preview performs well on challenging STEM benchmarks like FrontierScience-Olympiad and IMOAnswerBench, and achieved excellent results in the Tsinghua Qiuzhen College Math PhD qualifying exam (Spring '26) and the China High School Biology Olympiad (CHSBO 2025), demonstrating generalizable reasoning capacity.

• Context Learning & Instruction Following — Real-world tasks require the ability to parse messy, lengthy contexts and follow complex rules. We built CL-bench and CL-bench-Life from our own business scenarios to innovatively measure context learning ability. Hy3 preview exhibits solid gains in both context learning and instruction following capabilities.

• Code & Agent — Coding and agents saw the biggest gains. With a rebuilt RL infrastructure and larger-scale training tasks, we posted competitive scores across mainstream coding agent benchmarks (SWE-bench Verified, Terminal-Bench 2.0) and search agent benchmarks (BrowseComp, WideSearch).

Category	Benchmark (Metric)	# Shots	Kimi-K2 BASE	DeepSeek-V3 BASE	GLM-4.5 BASE	Hy3 preview-Base
	#ActivatedParams	-	32B	37B	32B	21B
	#TotalParams	-	1043B	671B	355B	295B
English	MMLU	5-shot	88.24	87.68	87.73	87.42
	MMLU-Pro	5-shot	65.98	63.98	63.67	65.76
	MMLU-Redux	5-shot	87.18	86.81	86.56	86.86
	ARC-Challenge	0-shot	96.66	94.65	96.32	95.99
	DROP	5-shot	86.40	86.50	82.90	85.50
	PIQA	4-shot	84.93	84.22	84.71	84.39
	SuperGPQA	5-shot	51.10	46.17	49.64	51.60
	SimpleQA	5-shot	34.37	26.15	29.26	26.47
Code	MBPP-plus	3-shot	81.35	75.47	78.05	78.71
	CRUXEval-I	3-shot	68.01	67.79	68.51	71.19
	CRUXEval-O	3-shot	69.62	71.00	67.75	68.38
	LiveCodeBench-v6	1-shot	30.86	29.31	27.43	34.86
Math	GSM8K	4-shot	93.46	88.15	90.06	95.37
	MATH	4-shot	71.20	59.37	61.00	76.28
	CMath	4-shot	90.83	85.50	89.33	91.17
Chinese	C-Eval	5-shot	91.51	90.35	85.84	89.80
	CMMLU	5-shot	90.72	87.90	86.46	89.61
	Chinese-simpleQA	5-shot	74.58	68.72	68.49	69.73
Multilingual	MMMLU	5-shot	77.63	79.54	79.26	80.15
	INCLUDE	5-shot	75.66	77.86	76.27	78.64

Complex reasoning underpins everything else. Hy3 preview performs well on challenging STEM benchmarks like FrontierScience-Olympiad and IMOAnswerBench. It also achieved excellent results in the Tsinghua Qiuzhen College Math PhD qualifying exam (Spring '26) and the China High School Biology Olympiad (CHSBO 2025), demonstrating a high degree of generalizable reasoning capacity.

Real-world tasks require the ability to parse messy, lengthy contexts and follow complex rules. We built CL-bench and CL-bench-Life from our own business scenarios to innovatively measure context learning ability. Hy3 preview exhibits solid gains in both context learning and instruction following capabilities.

Coding and agents saw the biggest gains. With a rebuilt RL infrastructure and larger-scale training tasks, we posted competitive scores across mainstream coding agent benchmarks (SWE-bench Verified, Terminal-Bench 2.0) and search agent benchmarks (BrowseComp, WideSearch).

Coding is about whether a model can execute in a development environment. Search is about whether it can find and combine information from the open web. Both matter for complex agent scenarios like OpenClaw. Hy3 preview scores well on ClawEval and WildClawBench — a sign that its agent capabilities are becoming practical.

Beyond public benchmarks, we built internal evaluation sets to test the model in real development scenarios. On Hy-Backend (backend-focused tasks), Hy-Vibe Bench (real-user dev workflows), and Hy-SWE Max, Hy3 preview scores competitively against other open-source models.

• [2026-04-23] 🔥 We open-source Hy3 preview model weights on Hugging Face, ModelScope, and GitCode.

Model Name	Description	Hugging Face	ModelScope	GitCode
Hy3 preview	Instruct model	🤗 Model	Model	Model
Hy3 preview-Base	Pre-trained base model	🤗 Model	Model	Model

Deploy Hy3 preview with vLLM or SGLang first, then call the OpenAI-compatible API:

from openai import OpenAI

client = OpenAI(base_url="http://localhost:8000/v1", api_key="EMPTY")

response = client.chat.completions.create(
    model="tencent/Hy3-preview",
    messages=[
        {"role": "user", "content": "Hello! Can you briefly introduce yourself?"},
    ],
    temperature=0.9,
    top_p=1.0,
    # reasoning_effort: "no_think" (default, direct response), "low", "high" (deep chain-of-thought)
    extra_body={"chat_template_kwargs": {"reasoning_effort": "no_think"}},
)
print(response.choices[0].message.content)

Recommended parameters: temperature=0.9, top_p=1.0.

Reasoning mode: Set reasoning_effort to "high" for complex tasks (math, coding, reasoning) or "no_think" for direct responses.

See the Deployment section below for how to start the API server.

Hy3-preview has 295B parameters in total. To serve it on 8 GPUs, we recommend using H20-3e or other GPUs with larger memory capacity.

Build vLLM from source:

uv venv --python 3.12 --seed --managed-python
source .venv/bin/activate
git clone https://github.com/vllm-project/vllm.git
cd vllm
uv pip install --editable . --torch-backend=auto

Start the vLLM server with MTP enabled:

vllm serve tencent/Hy3-preview \
  --tensor-parallel-size 8 \
  --speculative-config.method mtp \
  --speculative-config.num_speculative_tokens 1 \
  --tool-call-parser hy_v3 \
  --reasoning-parser hy_v3 \
  --enable-auto-tool-choice \
  --served-model-name hy3-preview

Build SGLang from source:

git clone https://github.com/sgl-project/sglang
cd sglang
pip3 install pip --upgrade
pip3 install "transformers>=5.6.0"
pip3 install -e "python"

Launch SGLang server with MTP enabled:

python3 -m sglang.launch_server \
  --model tencent/Hy3-preview \
  --tp 8 \
  --tool-call-parser hunyuan \
  --reasoning-parser hunyuan \
  --speculative-num-steps 1 \
  --speculative-eagle-topk 1 \
  --speculative-num-draft-tokens 2 \
  --speculative-algorithm EAGLE \
  --served-model-name hy3-preview

Hy3 preview provides a complete model training pipeline, supporting both full fine-tuning and LoRA fine-tuning, with DeepSpeed ZeRO configurations and LLaMA-Factory integration.

For detailed training documentation, please refer to: Training Guide

We provide AngelSlim, a more accessible, comprehensive, and efficient toolkit for large model compression. AngelSlim supports a comprehensive suite of compression tools for large-scale multimodal models, including common quantization algorithms, low-bit quantization, and speculative sampling.

Hy3 preview is released under the Tencent Hy Community License Agreement. See LICENSE for details.

If you would like to leave a message for our R&D and product teams, welcome to contact us. You can also reach us via email:

📧 hunyuan_opensource@tencent.com

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Hy3 preview is developed by the Tencent Hy Team.