Nova FP8 Quantized Version
This is a Nova-quantized FP8 version of Qwen/Qwen3-4B-Thinking-2507, optimized for high-throughput inference on H100 GPUs using FlashInfer.

⚡ 2x compression | 🚀 H100 optimized | 🔥 FlashInfer accelerated

Original Model Information

Qwen3-4B-Thinking-2507

Highlights

Over the past three months, we have continued to scale the thinking capability of Qwen3-4B, improving both the quality and depth of reasoning. We are pleased to introduce Qwen3-4B-Thinking-2507, featuring the following key enhancements:

Significantly improved performance on reasoning tasks, including logical reasoning, mathematics, science, coding, and academic benchmarks that typically require human expertise.
Markedly better general capabilities, such as instruction following, tool usage, text generation, and alignment with human preferences.
Enhanced 256K long-context understanding capabilities.

NOTE: This version has an increased thinking length. We strongly recommend its use in highly complex reasoning tasks.

Model Overview

Qwen3-4B-Thinking-2507 has the following features:

Type: Causal Language Models
Training Stage: Pretraining & Post-training
Number of Parameters: 4.0B
Number of Paramaters (Non-Embedding): 3.6B
Number of Layers: 36
Number of Attention Heads (GQA): 32 for Q and 8 for KV
Context Length: 262,144 natively.

NOTE: This model supports only thinking mode. Meanwhile, specifying enable_thinking=True is no longer required.

Additionally, to enforce model thinking, the default chat template automatically includes <think>. Therefore, it is normal for the model's output to contain only </think> without an explicit opening <think> tag.

For more details, including benchmark evaluation, hardware requirements, and inference performance, please refer to our blog, GitHub, and Documentation.

Performance

	Qwen3-30B-A3B Thinking	Qwen3-4B Thinking	Qwen3-4B-Thinking-2507
Knowledge
MMLU-Pro	78.5	70.4	74.0
MMLU-Redux	89.5	83.7	86.1
GPQA	65.8	55.9	65.8
SuperGPQA	51.8	42.7	47.8
Reasoning
AIME25	70.9	65.6	81.3
HMMT25	49.8	42.1	55.5
LiveBench 20241125	74.3	63.6	71.8
Coding
LiveCodeBench v6 (25.02-25.05)	57.4	48.4	55.2
CFEval	1940	1671	1852
OJBench	20.7	16.1	17.9
Alignment
IFEval	86.5	81.9	87.4
Arena-Hard v2$	36.3	13.7	34.9
Creative Writing v3	79.1	61.1	75.6
WritingBench	77.0	73.5	83.3
Agent
BFCL-v3	69.1	65.9	71.2
TAU1-Retail	61.7	33.9	66.1
TAU1-Airline	32.0	32.0	48.0
TAU2-Retail	34.2	38.6	53.5
TAU2-Airline	36.0	28.0	58.0
TAU2-Telecom	22.8	17.5	27.2
Multilingualism
MultiIF	72.2	66.3	77.3
MMLU-ProX	73.1	61.0	64.2
INCLUDE	71.9	61.8	64.4
PolyMATH	46.1	40.0	46.2

$ For reproducibility, we report the win rates evaluated by GPT-4.1.

& For highly challenging tasks (including PolyMATH and all reasoning and coding tasks), we use an output length of 81,920 tokens. For all other tasks, we set the output length to 32,768.

Quickstart

The code of Qwen3 has been in the latest Hugging Face transformers and we advise you to use the latest version of transformers.

With transformers<4.51.0, you will encounter the following error:

KeyError: 'qwen3'

The following contains a code snippet illustrating how to use the model generate content based on given inputs.

python

from transformers import AutoModelForCausalLM, AutoTokenizer

model_name = "Qwen/Qwen3-4B-Thinking-2507"

# load the tokenizer and the model
tokenizer = AutoTokenizer.from_pretrained(model_name)
model = AutoModelForCausalLM.from_pretrained(
    model_name,
    torch_dtype="auto",
    device_map="auto"
)

# prepare the model input
prompt = "Give me a short introduction to large language model."
messages = [
    {"role": "user", "content": prompt}
]
text = tokenizer.apply_chat_template(
    messages,
    tokenize=False,
    add_generation_prompt=True,
)
model_inputs = tokenizer([text], return_tensors="pt").to(model.device)

# conduct text completion
generated_ids = model.generate(
    **model_inputs,
    max_new_tokens=32768
)
output_ids = generated_ids[0][len(model_inputs.input_ids[0]):].tolist() 

# parsing thinking content
try:
    # rindex finding 151668 (</think>)
    index = len(output_ids) - output_ids[::-1].index(151668)
except ValueError:
    index = 0

thinking_content = tokenizer.decode(output_ids[:index], skip_special_tokens=True).strip("\n")
content = tokenizer.decode(output_ids[index:], skip_special_tokens=True).strip("\n")

print("thinking content:", thinking_content) # no opening <think> tag
print("content:", content)

For deployment, you can use sglang>=0.4.6.post1 or vllm>=0.8.5 or to create an OpenAI-compatible API endpoint:

SGLang:
python -m sglang.launch_server --model-path Qwen/Qwen3-4B-Thinking-2507 --context-length 262144 --reasoning-parser deepseek-r1
vLLM:
vllm serve Qwen/Qwen3-4B-Thinking-2507 --max-model-len 262144 --enable-reasoning --reasoning-parser deepseek_r1

Note: If you encounter out-of-memory (OOM) issues, you may consider reducing the context length to a smaller value. However, since the model may require longer token sequences for reasoning, we strongly recommend using a context length greater than 131,072 when possible.

For local use, applications such as Ollama, LMStudio, MLX-LM, llama.cpp, and KTransformers have also supported Qwen3.

Agentic Use

Qwen3 excels in tool calling capabilities. We recommend using Qwen-Agent to make the best use of agentic ability of Qwen3. Qwen-Agent encapsulates tool-calling templates and tool-calling parsers internally, greatly reducing coding complexity.

To define the available tools, you can use the MCP configuration file, use the integrated tool of Qwen-Agent, or integrate other tools by yourself.

python

from qwen_agent.agents import Assistant

# Define LLM
# Using OpenAI-compatible API endpoint. It is recommended to disable the reasoning and the tool call parsing
# functionality of the deployment frameworks and let Qwen-Agent automate the related operations. For example, 
# `VLLM_USE_MODELSCOPE=true vllm serve Qwen/Qwen3-4B-Thinking-2507 --served-model-name Qwen3-4B-Thinking-2507 --max-model-len 262144`.
llm_cfg = {
    'model': 'Qwen3-4B-Thinking-2507',

    # Use a custom endpoint compatible with OpenAI API:
    'model_server': 'http://localhost:8000/v1',  # api_base without reasoning and tool call parsing
    'api_key': 'EMPTY',
    'generate_cfg': {
        'thought_in_content': True,
    },
}

# Define Tools
tools = [
    {'mcpServers': {  # You can specify the MCP configuration file
            'time': {
                'command': 'uvx',
                'args': ['mcp-server-time', '--local-timezone=Asia/Shanghai']
            },
            "fetch": {
                "command": "uvx",
                "args": ["mcp-server-fetch"]
            }
        }
    },
  'code_interpreter',  # Built-in tools
]

# Define Agent
bot = Assistant(llm=llm_cfg, function_list=tools)

# Streaming generation
messages = [{'role': 'user', 'content': 'https://qwenlm.github.io/blog/ Introduce the latest developments of Qwen'}]
for responses in bot.run(messages=messages):
    pass
print(responses)

Best Practices

To achieve optimal performance, we recommend the following settings:

Sampling Parameters:
- We suggest using Temperature=0.6, TopP=0.95, TopK=20, and MinP=0.
- For supported frameworks, you can adjust the presence_penalty parameter between 0 and 2 to reduce endless repetitions. However, using a higher value may occasionally result in language mixing and a slight decrease in model performance.
Adequate Output Length: We recommend using an output length of 32,768 tokens for most queries. For benchmarking on highly complex problems, such as those found in math and programming competitions, we suggest setting the max output length to 81,920 tokens. This provides the model with sufficient space to generate detailed and comprehensive responses, thereby enhancing its overall performance.
Standardize Output Format: We recommend using prompts to standardize model outputs when benchmarking.
- Math Problems: Include "Please reason step by step, and put your final answer within \boxed{}." in the prompt.
- Multiple-Choice Questions: Add the following JSON structure to the prompt to standardize responses: "Please show your choice in the answer field with only the choice letter, e.g., "answer": "C"."
No Thinking Content in History: In multi-turn conversations, the historical model output should only include the final output part and does not need to include the thinking content. It is implemented in the provided chat template in Jinja2. However, for frameworks that do not directly use the Jinja2 chat template, it is up to the developers to ensure that the best practice is followed.

Citation

If you find our work helpful, feel free to give us a cite.

@misc{qwen3technicalreport,
      title={Qwen3 Technical Report}, 
      author={Qwen Team},
      year={2025},
      eprint={2505.09388},
      archivePrefix={arXiv},
      primaryClass={cs.CL},
      url={https://arxiv.org/abs/2505.09388}, 
}

Quantization Specifications

Model Type: qwen3
Architecture: Qwen3ForCausalLM
Use Case: Text
Quantization Method: Nova FP8 (E4M3)
Quantization Date: 2025-09-06
Compression Ratio: 2.00x
Quantized Layers: 252
Framework: FlashInfer-optimized for H100 Tensor Cores

Performance

Metric	Value
Model Size Reduction	50.0%
Quantization Time	0.14205670356750488 seconds
Memory Usage	11.70 GB

Validation Results

Test Prompt: "Hello, my name is"
Validation Status: ✅ Passed
Forward Pass: Forward pass completed successfully

Usage

This model requires the Nova inference engine with FlashInfer support:

python

# Install Nova (requires CUDA 12.8.1+ and H100 GPU)
pip install nova-inference flashinfer

# Load and use the model
from nova import load_model

model = load_model("remodlai/Qwen3-4B-Thinking-2507-nova-fp8")
output = model.generate("Your prompt here")

Limitations

Requires H100 GPUs with CUDA 12.8.1+
Only compatible with Nova inference engine
FlashInfer 0.2.14+ required
Not compatible with standard transformers library

Technical Details

Quantization Process

Model capabilities detected using Nova's AutoConfig analysis framework
Weights quantized to FP8 format using FlashInfer's to_float8() function
Scales stored as reciprocals for optimal FlashInfer bmm_fp8 performance
Weights transposed to column-major format as required by FlashInfer
The lm_head layer preserved in BF16 for output quality

Configuration

The model config includes Nova-specific metadata:

nova_quant: true
nova_quant_version: "1.0"
quantization_config: Contains format, optimization flags, and source model reference

Detected Configuration

json

{
  "model_type": "qwen3",
  "architectures": [
    "Qwen3ForCausalLM"
  ],
  "use_case": "text",
  "multimodal": false
}

Citation

If you use this model, please cite:

bibtex

@software{nova2025,
  title = {Nova FP8 Quantization},
  author = {Remodl AI},
  year = {2025},
  url = {https://github.com/remodlai/nova}
}

License

This quantized model maintains the same license as the source model (unknown). Please refer to the original model card for detailed license information.

remodlai/Qwen3-4B-Thinking-2507-Nova-fp8

Qwen3-4B-Thinking-2507-Nova-FP8

Original Model Information

Qwen3-4B-Thinking-2507

Highlights

Model Overview

Performance

Quickstart

Agentic Use

Best Practices

Citation

Quantization Specifications

Performance

Validation Results

Usage

Limitations

Technical Details

Quantization Process

Configuration

Detected Configuration

Citation

License

remodlai/
Qwen3-4B-Thinking-2507-Nova-fp8