Fresh 🌱

Stealth Mode

All Kernel browsers ship with anti-detection optimizations by default , you don't need stealth mode for this baseline.

Enabling stealth mode adds two managed services on top:

1. Default proxy , traffic routes through a static ISP proxy, providing a stable exit IP for the session.
2. Automatic CAPTCHA solver , solves reCAPTCHAs, Cloudflare challenges, and similar tests automatically.

Both are opt-out so you can bring your own where it makes sense.

IP Rotation Behavior

The default stealth proxy provides a static exit IP , all connections within the session exit through the same IP address. If you override the default with a residential proxy, exit IPs will rotate per connection. See Residential IP Rotation Behavior for details.

To turn on stealth mode, set its flag when instantiating Kernel browsers:

  import Kernel from '@onkernel/sdk';

  const kernel = new Kernel();

  const kernelBrowser = await kernel.browsers.create({
    stealth: true,
  });

from kernel import Kernel

kernel = Kernel()

kernel_browser = kernel.browsers.create(
    stealth=True,
)

Bring your own proxy or CAPTCHA solver

Anti-detection is the platform default, so you can freely mix in your own networking or CAPTCHA tooling. Common patterns:

• BYO proxy, keep CAPTCHA solver , launch a stealth browser with your own proxy via proxy_id. Replaces the residential default; CAPTCHA solver stays loaded.
• BYO proxy, no CAPTCHA solver , launch a non-stealth browser with your own proxy_id. Full anti-detection config, no managed proxy or CAPTCHA extension.
• Disable the default proxy at runtime , on a running stealth browser, set disable_default_proxy to route directly while keeping the CAPTCHA solver.

If you're looking for proxy-level configuration with Kernel browsers, see Proxies.

CAPTCHA Handling Behavior

Below are tips for working with Kernel's Stealth Mode auto-CAPTCHA solver across different challenge types and automation frameworks.

Anthropic Computer Use

Anthropic Computer Use stops when it encounters a CAPTCHA. Use Kernel's auto-CAPTCHA solver by adding this to your prompt:

"If you see a CAPTCHA or similar test, just wait for it to get solved automatically by the browser."

Cloudflare Challenge

When encountering a Cloudflare challenge, our auto-CAPTCHA solver will attempt to handle it. Once the "Ready" message appears on the screen, continue with your intended browser actions (e.g., entering credentials and submitting a login attempt).

INFO

After the "Ready" message appears, don't click the Cloudflare CAPTCHA checkbox , this can interfere with the solver.