Stealth Mode

Kernel browsers can be configured to stealth mode, which automatically adds our recommended proxy to your browser instances. It also adds a reCAPTCHA solver to the browser, so it automatically solves reCAPTCHAs on your behalf.

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

Typescript/Javascript

import Kernel from '@onkernel/sdk';

const kernel = new Kernel();

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

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).

After the “Ready” message appears, don’t click the Cloudflare CAPTCHA checkbox — this can interfere with the solver.