license: apache-2.0 language:

• zh
• en tags:
• AgentCPM-GUI
• gui agent
• android agent
• multimodal base_model:
• openbmb/MiniCPM-V-2_6 pipeline_tag: image-text-to-text

AgentCPM-GUI

GitHub | Technical Blog

News

• [2025-05-13] üöÄüöÄüöÄ We have open-sourced AgentCPM-GUI, an on-device GUI agent capable of operating Chinese & English apps and equipped with RFT-enhanced reasoning abilities.

Overview

AgentCPM-GUI is an open-source on-device LLM agent model jointly developed by THUNLP, Renmin University of China and ModelBest. Built on MiniCPM-V with 8 billion parameters, it accepts smartphone screenshots as input and autonomously executes user-specified tasks.

Key features include:

• High-quality GUI grounding ‚Äî Pre-training on a large-scale bilingual Android dataset significantly boosts localization and comprehension of common GUI widgets (buttons, input boxes, labels, icons, etc.).
• Chinese-app operation ‚Äî The first open-source GUI agent finely tuned for Chinese apps, covering 30 + popular titles such as Amap, Dianping, bilibili and Xiaohongshu.
• Enhanced planning & reasoning ‚Äî Reinforcement fine-tuning (RFT) lets the model ‚Äúthink‚Äù before outputting an action, greatly improving success on complex tasks.
• Compact action-space design ‚Äî An optimized action space and concise JSON format reduce the average action length to 9.7 tokens, boosting on-device inference efficiency.

Demo Case (1x speed):

https://github.com/user-attachments/assets/5472a659-cd71-4bce-a181-0981129c6a81

Quick Start

Install dependencies

git clone https://github.com/OpenBMB/AgentCPM-GUI
cd AgentCPM-GUI
conda create -n gui_agent python=3.11
conda activate gui_agent
pip install -r requirements.txt

Download the model

Download AgentCPM-GUI from Hugging Face and place it in model/AgentCPM-GUI.

Huggingface Inference

import torch
from transformers import AutoTokenizer, AutoModelForCausalLM
from PIL import Image
import json

# 1. Load the model and tokenizer
model_path = "model/AgentCPM-GUI"  # model path
tokenizer = AutoTokenizer.from_pretrained(model_path, trust_remote_code=True)
model = AutoModelForCausalLM.from_pretrained(model_path, trust_remote_code=True, torch_dtype=torch.bfloat16)
model = model.to("cuda:0") 

# 2. Build the input
instruction = "请点击屏幕上的‘会员’按钮"
image_path = "assets/test.jpeg"
image = Image.open(image_path).convert("RGB")

# 3. Resize the longer side to 1120 px to save compute & memory
def __resize__(origin_img):
    resolution = origin_img.size
    w,h = resolution
    max_line_res = 1120
    if max_line_res is not None:
        max_line = max_line_res
        if h > max_line:
            w = int(w * max_line / h)
            h = max_line
        if w > max_line:
            h = int(h * max_line / w)
            w = max_line
    img = origin_img.resize((w,h),resample=Image.Resampling.LANCZOS)
    return img
image = __resize__(image)

# 4. Build the message format
messages = [{
    "role": "user",
    "content": [
        f"<Question>{instruction}</Question>\n当前屏幕截图：",
        image
    ]
}]

# 5. Inference
ACTION_SCHEMA = json.load(open('eval/utils/schema/schema.json', encoding="utf-8"))
items = list(ACTION_SCHEMA.items())
insert_index = 3
items.insert(insert_index, ("required", ["thought"])) # enable/disable thought by setting it to "required"/"optional"
ACTION_SCHEMA = dict(items)
SYSTEM_PROMPT = f'''# Role
你是一名熟悉安卓系统触屏GUI操作的智能体，将根据用户的问题，分析当前界面的GUI元素和布局，生成相应的操作。

# Task
针对用户问题，根据输入的当前屏幕截图，输出下一步的操作。

# Rule
- 以紧凑JSON格式输出
- 输出操作必须遵循Schema约束

# Schema
{json.dumps(ACTION_SCHEMA, indent=None, ensure_ascii=False, separators=(',', ':'))}'''

outputs = model.chat(
    image=None,
    msgs=messages,
    system_prompt=SYSTEM_PROMPT,
    tokenizer=tokenizer,
    temperature=0.1,
    top_p=0.3,
    n=1,
)

# 6. Output
print(outputs)

Expected output:

{"thought":"任务目标是点击屏幕上的‘会员’按钮。当前界面显示了应用的推荐页面，顶部有一个导航栏。点击‘会员’按钮可以访问应用的会员相关内容。","POINT":[729,69]}

vLLM Inference

# Launch the vLLM server
vllm serve model/AgentCPM-GUI --served-model-name AgentCPM-GUI --tensor_parallel_size 1 --trust-remote-code

import base64
import io
import json
import requests
from PIL import Image

END_POINT = "http://localhost:8000/v1/chat/completions"  # Replace with actual endpoint

# system prompt
ACTION_SCHEMA = json.load(open('eval/utils/schema/schema.json', encoding="utf-8"))
items = list(ACTION_SCHEMA.items())
insert_index = 3
items.insert(insert_index, ("required", ["thought"])) # enable/disable thought by setting it to "required"/"optional"
ACTION_SCHEMA = dict(items)
SYSTEM_PROMPT = f'''# Role
你是一名熟悉安卓系统触屏GUI操作的智能体，将根据用户的问题，分析当前界面的GUI元素和布局，生成相应的操作。

# Task
针对用户问题，根据输入的当前屏幕截图，输出下一步的操作。

# Rule
- 以紧凑JSON格式输出
- 输出操作必须遵循Schema约束

# Schema
{json.dumps(ACTION_SCHEMA, indent=None, ensure_ascii=False, separators=(',', ':'))}'''

def encode_image(image: Image.Image) -> str:
    """Convert PIL Image to base64-encoded string."""
    with io.BytesIO() as in_mem_file:
        image.save(in_mem_file, format="JPEG")
        in_mem_file.seek(0)
        return base64.b64encode(in_mem_file.read()).decode("utf-8")

def __resize__(origin_img):
    resolution = origin_img.size
    w,h = resolution
    max_line_res = 1120
    if max_line_res is not None:
        max_line = max_line_res
        if h > max_line:
            w = int(w * max_line / h)
            h = max_line
        if w > max_line:
            h = int(h * max_line / w)
            w = max_line
    img = origin_img.resize((w,h),resample=Image.Resampling.LANCZOS)
    return img

def predict(text_prompt: str, image: Image.Image):
    messages = [
        {"role": "system", "content": SYSTEM_PROMPT},
        {"role": "user", "content": [
            {"type": "text", "text": f"<Question>{text_prompt}</Question>\n当前屏幕截图："},
            {"type": "image_url", "image_url": {"url": f"data:image/jpeg;base64,{encode_image(image)}"}}
        ]}
    ]

    payload = {
        "model": "AgentCPM-GUI",  # Your model name
        "temperature": 0.1,
        "messages": messages,
        "max_tokens": 2048,
    }

    headers = {
        "Content-Type": "application/json",
    }

    response = requests.post(END_POINT, headers=headers, json=payload)
    assistant_msg = response.json()["choices"][0]["message"]["content"]
    return assistant_msg

image = __resize__(Image.open("assets/test.jpeg"))
instruction = "请点击屏幕上的‘会员’按钮"
response = predict(instruction, image)
print(response)

Action Space

At each step, the agent outputs is a single JSON object that contains:

• One (and only one) primitive action, chosen from the list below;
• Optional modifiers (duration, thought) and/or a task-level flag (STATUS).

Note that all keywords are case-sensitive, and we use compact JSON (i.e., no extra whitespace), which affects the tokenizer’s behavior.

Fine-tuning

Source code for SFT and RFT training is provided — see GitHub.

Performance Evaluation

Grounding Benchmark

Agent Benchmark

*Different train/test splits

TM and EM stand for the Type Match and Exact Match, respectively. All evaluation data and code are open-sourced — see here for details.

All evaluation data and code are open-sourced — see here for details.

Evaluation Data

We provide CAGUI, an evaluation benchmark for Chinese apps covering grounding and agent tasks. See the dataset on Hugging Face.

License

• Code in this repository is released under the Apache-2.0 license.

Citation

If AgentCPM-GUI is useful for your research, please cite:

@misc{2025,
  author       = {THUNLP},
  title        = {AgentCPM-GUI},
  year         = {2025},
  publisher    = {GitHub},
  journal      = {GitHub repository},
  howpublished = {\url{https://github.com/OpenBMB/AgentCPM-GUI}}
}