--- title: Hy3 preview metatags: description: "Deploy Tencent Hy3 preview BF16 (~276B / ~20B active MoE) on NVIDIA GPUs with SGLang — hybrid thinking, native tool calling, 256K context, and built-in MTP speculative decoding." --- ## 1. Model Introduction Hy3 preview is Tencent's preview of its third-generation flagship MoE language model, featuring hybrid thinking, native tool calling, long-context reasoning, and Multi-Token Prediction (MTP) for low-latency serving. **Key Features:** - **MoE Architecture**: 192 routed experts + 1 shared expert, 8 experts activated per token. ~276B total parameters with ~20B active, delivering dense-model quality at MoE inference cost. - **Hybrid Thinking**: Reasoning modes (`high`, `medium`, `low`, `none`) controllable via OpenAI-standard `reasoning_effort`, allowing the same weights to trade off latency and depth of reasoning. - **Native Tool Calling**: Trained on structured `` / `` / `` grammar. Pairs with SGLang's `hunyuan` tool-call parser for streaming OpenAI-compatible function-calling output. - **Long Context**: 256K token context window (262,144 positions) for repository-scale code and document reasoning. - **Multi-Token Prediction (MTP)**: Ships with a built-in MTP draft module enabling speculative decoding out of the box. **Available Models:** - [tencent/Hy3-preview](https://huggingface.co/tencent/Hy3-preview) — BF16 instruct - [tencent/Hy3-preview-Base](https://huggingface.co/tencent/Hy3-preview-Base) — BF16 base **Recommended Generation Parameters:**

Parameter	Value
`temperature`	0.7
`top_p`	0.9
`reasoning_effort`	`high` / `medium` / `low` (thinking) or `none` (instant)

**License:** TODO — verify on HuggingFace model card. ## 2. SGLang Installation SGLang offers multiple installation methods. You can choose the most suitable installation method based on your hardware platform and requirements. Please refer to the [official SGLang installation guide](../../../docs/get-started/install) for installation instructions. **Docker Images by Hardware Platform:**

Hardware Platform	Docker Image
NVIDIA H200 / B200 / B300 / GB300	`lmsysorg/sglang:latest`

`lmsysorg/sglang:latest` bundles the HYV3 model code, the `hunyuan` tool-call / reasoning parsers, and the MTP draft-module runtime. For SGLang CPU installation, please refer to the [CPU version installation guide](../../../docs/hardware-platforms/cpu_server#installation). ## 3. Model Deployment This section provides deployment configurations optimized for different hardware platforms and use cases. ### 3.1 Basic Configuration **Interactive Command Generator**: Use the configuration selector below to automatically generate the appropriate deployment command for your hardware platform, quantization, and feature capabilities. import { Hunyuan3PreviewDeployment } from '/src/snippets/autoregressive/hunyuan3-preview-deployment.jsx' ### 3.2 Configuration Tips **Key Parameters:**

Parameter	Description	Recommended Value
`--tool-call-parser`	Tool call parser for function-calling support	`hunyuan`
`--reasoning-parser`	Reasoning parser for hybrid thinking modes	`hunyuan`
`--trust-remote-code`	Required for Hunyuan model loading	Always enabled
`--mem-fraction-static`	Static memory fraction (KV + activations)	`0.9`
`--tp`	Tensor parallelism size	`2` / `4` / `8` depending on hardware
`--attention-backend`	Attention backend (Blackwell only)	`trtllm_mha`
`--speculative-algorithm`	Speculative decoding via the bundled MTP draft	`EAGLE` + `--speculative-num-steps 3 --speculative-eagle-topk 1 --speculative-num-draft-tokens 4`

**Hardware Requirements: NVIDIA BF16 (`Hy3-preview`, ~552GB weights)** - **H200 (141GB) / B200 (180GB)**: TP=8 (minimum for BF16 to fit single-node). - **B300 (275GB) / GB300**: TP=4. - **A100 / H100 (80GB)**: not supported single-node — BF16 requires multi-node TP=16+ on 80GB-class GPUs. **Blackwell (B200 / B300 / GB300):** Auto-selected attention backend can mis-route for HYV3 on Blackwell. Always pass `--attention-backend trtllm_mha` explicitly on Blackwell hardware (the config generator above enforces this). **Multi-Token Prediction (MTP):** The `Hy3-preview` release bundles an MTP draft module. SGLang runs it via its EAGLE speculative-decoding path — the draft module auto-loads from the same `--model-path`. Enable with the standard MTP flags: ```bash Command sglang serve \ --model-path tencent/Hy3-preview \ --tp 8 \ --speculative-algorithm EAGLE \ --speculative-num-steps 3 \ --speculative-eagle-topk 1 \ --speculative-num-draft-tokens 4 \ --reasoning-parser hunyuan \ --tool-call-parser hunyuan \ --trust-remote-code \ --mem-fraction-static 0.85 ``` Toggle the "Speculative Decoding (MTP)" option in the generator above to add these flags automatically. Tune `num-steps` / `num-draft-tokens` based on acceptance rate in your workload. **Xeon CPU service configuration:** Please refer to the `Notes` part in the serving engine launching section in [the SGLang CPU server document](../../../docs/hardware-platforms/cpu_server#launch-of-the-serving-engine) to better understand how to configure the arguments, especially for TP (tensor parallel) and NUMA binding settings. ## 4. Model Invocation ### 4.1 Basic Usage For basic API usage and request examples, please refer to: - [SGLang Basic Usage Guide](../../../docs/basic_usage/send_request) **Deployment Command (H200 × 8, BF16 default):** ```bash Command sglang serve \ --model-path tencent/Hy3-preview \ --tp 8 \ --reasoning-parser hunyuan \ --tool-call-parser hunyuan \ --trust-remote-code \ --mem-fraction-static 0.9 ``` **Testing Deployment:** After startup, you can test the SGLang OpenAI-compatible API with the following command: ```bash Command curl http://localhost:30000/v1/chat/completions \ -H "Content-Type: application/json" \ -d '{ "model": "tencent/Hy3-preview", "messages": [ {"role": "system", "content": "You are a helpful assistant."}, {"role": "user", "content": "Who won the world series in 2020?"} ] }' ``` **Simple Completion Example:** ```python Example from openai import OpenAI client = OpenAI( base_url="http://localhost:30000/v1", api_key="EMPTY" ) response = client.chat.completions.create( model="tencent/Hy3-preview", messages=[ {"role": "system", "content": "You are a helpful assistant."}, {"role": "user", "content": "Who won the world series in 2020?"} ], max_tokens=1024 ) print("Reasoning:", response.choices[0].message.reasoning_content) print("Content: ", response.choices[0].message.content) ``` **Output Example:** ```text Output Reasoning: None Content: The Los Angeles Dodgers won the 2020 World Series. They defeated the Tampa Bay Rays in six games (4-2). This was the Dodgers' first World Series championship since 1988. The series was notable for being played in a neutral-site bubble at Globe Life Field in Arlington, Texas, due to the COVID-19 pandemic. ``` When `reasoning_effort` is not set, the server defaults to instant mode (no thinking, `reasoning_content=None`). To opt into thinking, pass `reasoning_effort="high" / "medium" / "low"` on the request — see the Hybrid Thinking section below. ### 4.2 Advanced Usage #### 4.2.1 Reasoning Parser (Hybrid Thinking) Hy3-preview is a hybrid-thinking model. Control the thinking budget via the OpenAI-standard `reasoning_effort`: - `high` / `medium` / `low` — increasing amounts of chain-of-thought in `reasoning_content` - `none` — skip thinking entirely (instant responses, content-only) Enable the reasoning parser during deployment so that the thinking section (`...`) is separated into `reasoning_content`: ```bash Command sglang serve \ --model-path tencent/Hy3-preview \ --tp 8 \ --reasoning-parser hunyuan \ --trust-remote-code \ --mem-fraction-static 0.9 ``` **Thinking Mode — High Effort:** ```python Example from openai import OpenAI client = OpenAI(base_url="http://localhost:30000/v1", api_key="EMPTY") response = client.chat.completions.create( model="tencent/Hy3-preview", messages=[{"role": "user", "content": "Solve step by step: What is 15% of 240?"}], reasoning_effort="high", max_tokens=2048, ) msg = response.choices[0].message print("=============== Thinking =================") print(msg.reasoning_content) print("=============== Content =================") print(msg.content) ``` **Output Example:** ```text Output =============== Thinking ================= We need to solve: "What is 15% of 240?" Step by step. So we need to compute 15% of 240. The process: 15% means 15 per hundred, i.e., 15/100 = 0.15. Multiply 0.15 by 240. Or we can do: 10% of 240 = 24, 5% is half of 10% = 12, so sum = 36. Or do multiplication: 15/100 * 240 = (15*240)/100 = (3600)/100 = 36. So answer is 36. We need to produce step-by-step explanation. The instruction: "Solve step by step: What is 15% of 240?" So we should provide a clear solution with steps. The final answer: 36. Also maybe include units? No units. We'll output the solution in a clear manner. =============== Content ================= To find 15% of 240, follow these steps: 1. **Understand that percent means "per hundred."** So, 15% = 15/100 or 0.15. 2. **Multiply the number (240) by the percentage in decimal form.** 0.15 × 240. Alternatively, you can use fractions: (15/100) × 240. 3. **Perform the multiplication.** 0.15 × 240 = 36. Or: (15 × 240) / 100 = 3600 / 100 = 36. 4. **Check using an alternative method:** - 10% of 240 = 24. - 5% of 240 = half of 10% = 12. - 15% = 10% + 5% = 24 + 12 = 36. Thus, **15% of 240 is 36**. ``` **Instant Mode — No Thinking:** ```python Example response = client.chat.completions.create( model="tencent/Hy3-preview", messages=[{"role": "user", "content": "Give me a one-line summary of relativity."}], reasoning_effort="none", max_tokens=256, ) print("Content:", response.choices[0].message.content) ``` **Output Example:** ```text Output Content: Relativity is Einstein's theory that space, time, mass, and gravity are interconnected and relative, not fixed, fundamentally changing our understanding of the universe. ``` #### 4.2.2 Tool Calling Hy3-preview supports streaming OpenAI-compatible tool calls. Enable both parsers together — the reasoning parser strips thinking tokens before the tool-call parser runs: ```bash Command sglang serve \ --model-path tencent/Hy3-preview \ --tp 8 \ --reasoning-parser hunyuan \ --tool-call-parser hunyuan \ --trust-remote-code \ --mem-fraction-static 0.9 ``` **Non-Streaming Example:** ```python Example from openai import OpenAI client = OpenAI(base_url="http://localhost:30000/v1", api_key="EMPTY") tools = [ { "type": "function", "function": { "name": "get_weather", "description": "Get the current weather for a city.", "parameters": { "type": "object", "properties": { "city": {"type": "string"}, "unit": {"type": "string", "enum": ["celsius", "fahrenheit"]}, }, "required": ["city"], }, }, } ] response = client.chat.completions.create( model="tencent/Hy3-preview", messages=[{"role": "user", "content": "What's the weather in Beijing? Use fahrenheit."}], tools=tools, ) msg = response.choices[0].message print("Reasoning:", msg.reasoning_content) print("Content: ", msg.content) for tc in msg.tool_calls or []: print(f"Tool Call: {tc.function.name}") print(f" Arguments: {tc.function.arguments}") ``` **Output Example:** ```text Output Reasoning: None Content: I'll get the current weather for Beijing in Fahrenheit for you. Tool Call: get_weather Arguments: {"city": "Beijing", "unit": "fahrenheit"} ``` **Streaming Example (incremental argument deltas):** Hy3-preview's `hunyuan` tool-call parser emits tool names first, then argument JSON in incremental fragments — matching the OpenAI streaming contract: ```python Example from openai import OpenAI client = OpenAI(base_url="http://localhost:30000/v1", api_key="EMPTY") stream = client.chat.completions.create( model="tencent/Hy3-preview", messages=[{"role": "user", "content": "What's the weather in Beijing? Use fahrenheit."}], tools=tools, stream=True, ) tool_buffer = {} for chunk in stream: delta = chunk.choices[0].delta if delta.content: print(delta.content, end="", flush=True) for tc in delta.tool_calls or []: buf = tool_buffer.setdefault(tc.index, {"name": "", "args": ""}) if tc.function and tc.function.name: buf["name"] += tc.function.name if tc.function and tc.function.arguments: buf["args"] += tc.function.arguments for idx, buf in tool_buffer.items(): print(f"\nTool[{idx}] {buf['name']}({buf['args']})") ``` **Output Example:** ```text Output I'll check the current weather in Beijing for you using Fahrenheit. Tool[0] get_weather({"city": "Beijing", "unit": "fahrenheit"}) ``` ## 5. Benchmark ### 5.1 Accuracy Benchmark **Test Environment:** - Hardware: 8× NVIDIA H200 (141GB) - Docker Image: `lmsysorg/sglang:hy3-preview` - Model: `tencent/Hy3-preview` (BF16) - Tensor Parallelism: 8 - SGLang version: latest `main` #### 5.1.1 GSM8K - Benchmark Method: 5-shot CoT on 200 questions, evaluated via SGLang native backend - Benchmark Command: ```bash Command python3 benchmark/gsm8k/bench_sglang.py --num-questions 200 --parallel 64 ``` - Test Results: ```text Output TODO — replace with real GSM8K accuracy after benchmark run on Hy3-preview (BF16). ``` #### 5.1.2 MMLU - Benchmark Method: 5-shot, all 57 subjects - Benchmark Command: ```bash Command python3 benchmark/mmlu/bench_sglang.py --nsub 60 --parallel 64 ``` - Test Results: ```text Output TODO — replace with real MMLU accuracy after benchmark run on Hy3-preview (BF16). ``` #### 5.1.3 Tool-Call Accuracy (MiniMax-Provider-Verifier) - Benchmark Tool: [MiniMax-Provider-Verifier](https://github.com/MiniMax-AI/MiniMax-Provider-Verifier) - Metric: function-call schema validity, argument match, and end-to-end response correctness - Test Results: ```text Output TODO — replace with real tool-call accuracy after benchmark run on Hy3-preview (BF16). ``` ### 5.2 Speed Benchmark #### 5.2.1 Low Concurrency - Benchmark Command: ```bash Command python3 -m sglang.bench_serving \ --backend sglang \ --model tencent/Hy3-preview \ --dataset-name random \ --random-input-len 1000 \ --random-output-len 1000 \ --num-prompts 10 \ --max-concurrency 1 ``` - Test Results: ```text Output TODO — replace with real low-concurrency output on Hy3-preview (BF16). ``` #### 5.2.2 High Concurrency - Benchmark Command: ```bash Command python3 -m sglang.bench_serving \ --backend sglang \ --model tencent/Hy3-preview \ --dataset-name random \ --random-input-len 1000 \ --random-output-len 1000 \ --num-prompts 500 \ --max-concurrency 100 ``` - Test Results: ```text Output TODO — replace with real high-concurrency output on Hy3-preview (BF16). ```