Instructions to use fiveflow/r0_256 with libraries, inference providers, notebooks, and local apps. Follow these links to get started.

Libraries

How to use fiveflow/r0_256 with Transformers:

# Use a pipeline as a high-level helper
from transformers import pipeline

pipe = pipeline("text-generation", model="fiveflow/r0_256")
messages = [
    {"role": "user", "content": "Who are you?"},
]
pipe(messages)

# pip install -U transformers accelerate
# Load model directly
from transformers import AutoTokenizer, AutoModelForCausalLM

tokenizer = AutoTokenizer.from_pretrained("fiveflow/r0_256")
model = AutoModelForCausalLM.from_pretrained("fiveflow/r0_256", device_map="auto")
messages = [
    {"role": "user", "content": "Who are you?"},
]
inputs = tokenizer.apply_chat_template(
	messages,
	add_generation_prompt=True,
	tokenize=True,
	return_dict=True,
	return_tensors="pt",
).to(model.device)

outputs = model.generate(**inputs, max_new_tokens=256)
print(tokenizer.decode(outputs[0][inputs["input_ids"].shape[-1]:]))

Notebooks
Google Colab
Kaggle
Local Apps Settings

vLLM

How to use fiveflow/r0_256 with vLLM:

Install from pip and serve model

# Install vLLM from pip:
pip install vllm
# Start the vLLM server:
vllm serve "fiveflow/r0_256"
# Call the server using curl (OpenAI-compatible API):
curl -X POST "http://localhost:8000/v1/chat/completions" \
	-H "Content-Type: application/json" \
	--data '{
		"model": "fiveflow/r0_256",
		"messages": [
			{
				"role": "user",
				"content": "What is the capital of France?"
			}
		]
	}'

Use Docker

docker model run hf.co/fiveflow/r0_256

SGLang

How to use fiveflow/r0_256 with SGLang:

Install from pip and serve model

# Install SGLang from pip:
pip install sglang
# Start the SGLang server:
python3 -m sglang.launch_server \
    --model-path "fiveflow/r0_256" \
    --host 0.0.0.0 \
    --port 30000
# Call the server using curl (OpenAI-compatible API):
curl -X POST "http://localhost:30000/v1/chat/completions" \
	-H "Content-Type: application/json" \
	--data '{
		"model": "fiveflow/r0_256",
		"messages": [
			{
				"role": "user",
				"content": "What is the capital of France?"
			}
		]
	}'

Use Docker images

docker run --gpus all \
    --shm-size 32g \
    -p 30000:30000 \
    -v ~/.cache/huggingface:/root/.cache/huggingface \
    --env "HF_TOKEN=<secret>" \
    --ipc=host \
    lmsysorg/sglang:latest \
    python3 -m sglang.launch_server \
        --model-path "fiveflow/r0_256" \
        --host 0.0.0.0 \
        --port 30000
# Call the server using curl (OpenAI-compatible API):
curl -X POST "http://localhost:30000/v1/chat/completions" \
	-H "Content-Type: application/json" \
	--data '{
		"model": "fiveflow/r0_256",
		"messages": [
			{
				"role": "user",
				"content": "What is the capital of France?"
			}
		]
	}'

Docker Model Runner
How to use fiveflow/r0_256 with Docker Model Runner:
```
docker model run hf.co/fiveflow/r0_256
```

fiveflow commited on 18 days ago

Commit

9c5bdac

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1 Parent(s): 20f0e58

Add model card for r0_256

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README.md +25 -0

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+---
+license: apache-2.0
+base_model: Qwen/Qwen3-8B-Base
+library_name: transformers
+pipeline_tag: text-generation
+tags:
+- qwen3
+- r-zero
+- math
+- reinforcement-learning
+---
+# R-Zero Qwen3-8B-Base — global step 256
+This repository contains the user's R-Zero experiment solver checkpoint at cumulative
+global step 256 (round 8, round-local step 32). It is an experiment artifact,
+not an official release by the Qwen or R-Zero authors.
+The safetensors shards and tokenizer/configuration files are copied directly from
+the Hugging Face-format merged checkpoint.
+- **Base Model**: [Qwen/Qwen3-8B-Base](https://huggingface.co/Qwen/Qwen3-8B-Base)
+- **Method**: R-Zero co-evolutionary loop (Solver)
+- **Cumulative Global Step**: 256
+- **Round**: 8 (round-local step 32)