Start a new browser session

import Stagehand from 'stagehand-sdk';

const client = new Stagehand({
  browserbaseAPIKey: process.env['BROWSERBASE_API_KEY'], // This is the default and can be omitted
  browserbaseProjectID: process.env['BROWSERBASE_PROJECT_ID'], // This is the default and can be omitted
  modelAPIKey: process.env['MODEL_API_KEY'], // This is the default and can be omitted
});

const response = await client.sessions.start({ modelName: 'openai/gpt-5.4-mini' });

console.log(response.data);

{
  "success": true,
  "data": {
    "sessionId": "c4dbf3a9-9a58-4b22-8a1c-9f20f9f9e123",
    "available": true,
    "cdpUrl": "wss://connect.browserbase.com/?signingKey=abc123"
  }
}