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OpenAI CUA

OpenAI CUA

Run OpenAI's Computer-Using Agent on Lightcone browser sessions.

Run OpenAI’s Computer-Using Agent (CUA) on Lightcone cloud browsers. CUA is OpenAI’s protocol for AI agents that see and interact with computer screens. Lightcone provides the sandboxed browser environment; OpenAI’s CUA model provides the vision and reasoning.

How it works

Section titled “How it works”
  1. Create a Lightcone browser session
  2. Connect to it via Playwright using the CDP endpoint
  3. Run the OpenAI CUA loop — the model sees screenshots, decides actions, and Playwright executes them

Setup

Section titled “Setup”
Terminal window
pip install tzafon playwright openai
playwright install chromium

Example

Section titled “Example”
from tzafon import Lightcone
from playwright.sync_api import sync_playwright
from openai import OpenAI


# Create a Lightcone browser session
lc = Lightcone()
session = lc.computers.create(kind="browser")


# Get the CDP endpoint
cdp_url = session.endpoints.get("cdp")


# Connect Playwright to the remote browser
with sync_playwright() as p:
    browser = p.chromium.connect_over_cdp(cdp_url)
    page = browser.contexts[0].pages[0]


    # Navigate
    page.goto("https://example.com")


    # Take a screenshot for CUA
    screenshot = page.screenshot()


    # Use OpenAI CUA to reason about the page
    client = OpenAI()
    response = client.responses.create(
        model="computer-use-preview",
        tools=[{
            "type": "computer_use_preview",
            "display_width": 1280,
            "display_height": 720,
            "environment": "browser",
        }],
        input=[{
            "role": "user",
            "content": [
                {"type": "input_text", "text": "Find the main heading on this page"},
                {"type": "input_image", "image_url": f"data:image/png;base64,{screenshot.hex()}"},
            ],
        }],
    )


    print(response.output)


    browser.close()


lc.computers.delete(session.id)

Why use Lightcone with OpenAI CUA?

Section titled “Why use Lightcone with OpenAI CUA?”
  • Stealth browsers — Lightcone’s browsers include anti-detection features that prevent sites from blocking automation
  • Residential proxies — Route traffic through residential IPs for additional stealth
  • Session persistence — Save and restore browser state (cookies, local storage) across runs
  • Scalability — Spin up hundreds of concurrent browser sessions

Resources

Section titled “Resources”

See also

Section titled “See also”