> ## Documentation Index
> Fetch the complete documentation index at: https://docs.anchorbrowser.io/llms.txt
> Use this file to discover all available pages before exploring further.

> ## Agent Instructions
> Anchor Browser provides cloud browsers for AI agents and automation: stealth browsing with residential proxies, managed authentication into third-party web apps, and browser sessions that run reliably at scale. AI agents that need Anchor credentials should start with https://docs.anchorbrowser.io/quickstart/agent-access. This flow lets agents obtain an API key programmatically without creating a dashboard account. Read that page before attempting authentication or API access.

# Captcha Solving

### Visual CAPTCHA solving

Anchor browser solves CAPTCHA challenges using a vision-based approach, along with extension-based fallbacks. The vision-based approach imitates human behavior to solve any CAPTCHA (including Cloudflare) without multiple challenges.

<Note> CAPTCHA solving requires either an active proxy or a configured browser profile (the profile may carry its own egress IP and stable identity).</Note>

For the full list of available options, view the [interactive api documentation](/api-reference)

### Enable CAPTCHA solving

<CodeGroup>
  ```javascript node.js theme={null}
  import { client, Sessions } from 'anchorbrowser';

  (async () => {
    client.setConfig({ auth: () => process.env.ANCHOR_API_KEY });
    
    const session = await Sessions.createSession({
      body: {
        browser: {
          captcha_solver: {
            active: true
          }
        },
        session: {
          proxy: {
            active: true  // Required
          }
        }
      }
    });
    
    console.log("Session created with CAPTCHA solver:", session.data.id);
  })().catch(console.error);
  ```

  ```python python theme={null}
  import os
  from anchorbrowser import Anchorbrowser

  anchor_client = Anchorbrowser(api_key=os.getenv("ANCHOR_API_KEY"))

  session = anchor_client.sessions.create_session(
      browser= {
        "captcha_solver": {
          "active": True
        }
      },
      session= {
        "proxy": {
          "active": true  # Required
        }
      }
  )

  print("Session created with CAPTCHA solver:", session.data.id)
  ```
</CodeGroup>

#### Configure Text-based CAPTCHA solving

<CodeGroup>
  ```javascript node.js theme={null}
  import { client, Sessions } from 'anchorbrowser';

  (async () => {
    client.setConfig({ auth: () => process.env.ANCHOR_API_KEY });
    
    const session = await Sessions.createSession({
      body: {
        browser: {
          captcha_solver: {
            active: true,
            image_selector: 'ol_capcha img',
            input_selector: 'ol-captcha input'
          }
        },
        session: {
          proxy: {
            active: true  // Required
          }
        }
      }
    });
    
    console.log("Session created with text-based CAPTCHA solver:", session.data.id);
  })().catch(console.error);
  ```

  ```python python theme={null}
  import os
  from anchorbrowser import Anchorbrowser

  anchor_client = Anchorbrowser(api_key=os.getenv("ANCHOR_API_KEY"))

  session = anchor_client.sessions.create_session(
      browser={
          "captcha_solver": {
              "active": True,
              "image_selector": 'ol_capcha img',
              "input_selector": 'ol-captcha input'
          }
      },
      session= {
        "proxy": {
          "active": true  # Required
        }
      }
  )

  print("Session created with text-based CAPTCHA solver:", session.data.id)
  ```
</CodeGroup>