Instructions to use stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S with libraries, inference providers, notebooks, and local apps. Follow these links to get started.

Libraries

How to use stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S with Transformers:

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

pipe = pipeline("text-generation", model="stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S", trust_remote_code=True)
messages = [
    {"role": "user", "content": "Who are you?"},
]
pipe(messages)

# Load model directly
from transformers import AutoModelForCausalLM
model = AutoModelForCausalLM.from_pretrained("stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S", trust_remote_code=True, device_map="auto")

Notebooks
Google Colab
Kaggle
Local Apps Settings

llama.cpp

How to use stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S with llama.cpp:

Install (macOS, Linux)

curl -LsSf https://llama.app/install.sh | sh
# Start a local OpenAI-compatible server with a web UI:
llama serve -hf stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S:Q4_K_S
# Run inference directly in the terminal:
llama cli -hf stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S:Q4_K_S

Install from WinGet (Windows)

winget install llama.cpp
# Start a local OpenAI-compatible server with a web UI:
llama serve -hf stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S:Q4_K_S
# Run inference directly in the terminal:
llama cli -hf stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S:Q4_K_S

Use pre-built binary

# Download pre-built binary from:
# https://github.com/ggerganov/llama.cpp/releases
# Start a local OpenAI-compatible server with a web UI:
./llama-server -hf stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S:Q4_K_S
# Run inference directly in the terminal:
./llama-cli -hf stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S:Q4_K_S

Build from source code

git clone https://github.com/ggerganov/llama.cpp.git
cd llama.cpp
cmake -B build
cmake --build build -j --target llama-server llama-cli
# Start a local OpenAI-compatible server with a web UI:
./build/bin/llama-server -hf stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S:Q4_K_S
# Run inference directly in the terminal:
./build/bin/llama-cli -hf stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S:Q4_K_S

Use Docker

docker model run hf.co/stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S:Q4_K_S

LM Studio
Jan

vLLM

How to use stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S with vLLM:

Install from pip and serve model

# Install vLLM from pip:
pip install vllm
# Start the vLLM server:
vllm serve "stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S"
# Call the server using curl (OpenAI-compatible API):
curl -X POST "http://localhost:8000/v1/chat/completions" \
	-H "Content-Type: application/json" \
	--data '{
		"model": "stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S",
		"messages": [
			{
				"role": "user",
				"content": "What is the capital of France?"
			}
		]
	}'

Use Docker

docker model run hf.co/stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S:Q4_K_S

SGLang

How to use stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S 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 "stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S" \
    --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": "stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S",
		"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 "stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S" \
        --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": "stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S",
		"messages": [
			{
				"role": "user",
				"content": "What is the capital of France?"
			}
		]
	}'

Ollama
How to use stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S with Ollama:
```
ollama run hf.co/stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S:Q4_K_S
```

Unsloth Studio

How to use stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S with Unsloth Studio:

Install Unsloth Studio (macOS, Linux, WSL)

curl -fsSL https://unsloth.ai/install.sh | sh
# Run unsloth studio
unsloth studio -H 0.0.0.0 -p 8888
# Then open http://localhost:8888 in your browser
# Search for stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S to start chatting

Install Unsloth Studio (Windows)

irm https://unsloth.ai/install.ps1 | iex
# Run unsloth studio
unsloth studio -H 0.0.0.0 -p 8888
# Then open http://localhost:8888 in your browser
# Search for stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S to start chatting

Using HuggingFace Spaces for Unsloth

# No setup required
# Open https://huggingface.co/spaces/unsloth/studio in your browser
# Search for stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S to start chatting

How to use stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S with Pi:

Start the llama.cpp server

# Install llama.cpp:
brew install llama.cpp
# Start a local OpenAI-compatible server:
llama serve -hf stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S:Q4_K_S

Configure the model in Pi

# Install Pi:
npm install -g @mariozechner/pi-coding-agent
# Add to ~/.pi/agent/models.json:
{
  "providers": {
    "llama-cpp": {
      "baseUrl": "http://localhost:8080/v1",
      "api": "openai-completions",
      "apiKey": "none",
      "models": [
        {
          "id": "stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S:Q4_K_S"
        }
      ]
    }
  }
}

Run Pi

# Start Pi in your project directory:
pi

Hermes Agent new

How to use stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S with Hermes Agent:

Start the llama.cpp server

# Install llama.cpp:
brew install llama.cpp
# Start a local OpenAI-compatible server:
llama serve -hf stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S:Q4_K_S

Configure Hermes

# Install Hermes:
curl -fsSL https://hermes-agent.nousresearch.com/install.sh | bash
hermes setup
# Point Hermes at the local server:
hermes config set model.provider custom
hermes config set model.base_url http://127.0.0.1:8080/v1
hermes config set model.default stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S:Q4_K_S

Run Hermes

hermes

Atomic Chat new

OpenClaw new

How to use stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S with OpenClaw:

Start the llama.cpp server

# Install llama.cpp:
brew install llama.cpp
# Start a local OpenAI-compatible server:
llama serve -hf stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S:Q4_K_S

Configure OpenClaw

# Install OpenClaw:
npm install -g openclaw@latest
# Register the local server and set it as the default model:
openclaw onboard --non-interactive --mode local \
  --auth-choice custom-api-key \
  --custom-base-url http://127.0.0.1:8080/v1 \
  --custom-model-id "stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S:Q4_K_S" \
  --custom-provider-id llama-cpp \
  --custom-compatibility openai \
  --custom-text-input \
  --accept-risk \
  --skip-health

Run OpenClaw

openclaw agent --local --agent main --message "Hello from Hugging Face"

Docker Model Runner
How to use stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S with Docker Model Runner:
```
docker model run hf.co/stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S:Q4_K_S
```

Lemonade

How to use stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S with Lemonade:

Pull the model

# Download Lemonade from https://lemonade-server.ai/
lemonade pull stepfun-ai/Step-3.5-Flash-GGUF-Q4_K_S:Q4_K_S

Run and chat with the model

lemonade run user.Step-3.5-Flash-GGUF-Q4_K_S-Q4_K_S

List all available models

lemonade list

How do I run it using Oobabooga? I'm getting the following error

#10

by TeaDiffusion - opened Feb 5

Discussion

TeaDiffusion

Feb 5

llama_model_load: error loading model: error loading model architecture: unknown model architecture: 'step35'
llama_model_load_from_file_impl: failed to load model
common_init_from_params: failed to load model 'user_data/models/Step-3.5_Flash/step3p5_flash_Q4_K_S-00001-of-00012.gguf'
srv load_model: failed to load model, 'user_data/models/Step-3.5_Flash/step3p5_flash_Q4_K_S-00001-of-00012.gguf'
srv operator(): operator(): cleaning up before exit...
main: exiting due to model loading error
12:40:32-033723 ERROR Error loading the model with llama.cpp: Server process terminated
unexpectedly with exit code: 1

I downloaded the 12 parts and put them into the models directory, when trying to load it on Oobabooga (I have 128GB of RAM + 24GB VRAM) I'm shown the previous error prompt. Hope someone can help me figure this one out

Green-eyedDevil

Feb 6

Currently only their custom fork of llama.cpp has support for the model. It will probably be about a month before oobabooga supports this model.
https://github.com/stepfun-ai/Step-3.5-Flash/tree/main/llama.cpp

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