Make stagehand version 3 work with AI SDK 6

[jlmagee]

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• Check the documentation for relevant information
• Search existing issues to avoid duplicates

Environment Information

Please provide the following information to help us reproduce and resolve your issue:

Stagehand:

• Language/SDK: [TypeScript, Python, MCP…] Typescript
• Stagehand version: [e.g., 1.0.0] 3,0.6

AI Provider:

version: 'v3',
provider: 'google.generative-ai',
modelId: 'gemini-1.5-pro-latest',

Issue Description

Login failed: UnsupportedModelVersionError [AI_UnsupportedModelVersionError]: Unsupported model version v3 for provider "google.generative-ai" and model "gemini-1.5-pro-latest". AI SDK 5 only supports models that implement specification version "v2".
at resolveLanguageModel (/home/jlmagee/webdev/stagehand/node_modules/@browserbasehq/stagehand/node_modules/ai/src/model/resolve-model.ts:16:13)
at generateObject (/home/jlmagee/webdev/stagehand/node_modules/@browserbasehq/stagehand/node_modules/ai/src/generate-object/generate-object.ts:216:17)

[Describe the current behavior here]
no code or configuration combinations can make this work

Steps to Reproduce

Minimal Reproduction Code

// Your minimal reproduction code here
import { Stagehand, AISdkClient } from "@browserbasehq/stagehand";
import { createGoogleGenerativeAI } from "@ai-sdk/google";
import { z } from "zod";
import * as dotenv from "dotenv";

// 1. Load the .env file into process.env
dotenv.config();

// 2. Validate that the key exists (Safety Check)
if (!process.env.GOOGLE_GENERATIVE_AI_API_KEY) {
    throw new Error("Missing GOOGLE_GENERATIVE_AI_API_KEY in .env file");
}

const google = createGoogleGenerativeAI({
    apiKey: process.env.GOOGLE_GENERATIVE_AI_API_KEY,
});

async function main() {
    const stagehand = new Stagehand({
        env: "LOCAL",
        llmClient: new AISdkClient({
            model: google("gemini-1.5-pro-latest") as any,
        }),
    });

    await stagehand.init();
    const page = await stagehand.context.awaitActivePage();
    //  const page = stagehand.page;

    // Now you can use those variables safely!
    if (!page) {
        throw new Error("Stagehand failed to initialize the primary page.");
    }

    console.log(`Logging in as: ${process.env.APP_USERNAME}`);

    try {
        await page.goto("https://www.brisnet.com/product/login");

        // Using page.act for the login interaction

        await stagehand.act(
            `Login with username ${process.env.APP_USERNAME} and password ${process.env.APP_PASSWORD}`
        );

        console.log("Login action sent. Waiting for navigation...");
    } catch (error) {
        console.error("Login failed:", error);
    } finally {
        // Keep browser open for a few seconds to verify before closing
        await new Promise(resolve => setTimeout(resolve, 5000));
        await stagehand.close();
    }
}


main().catch(console.error);

// Steps that reproduce the issue

Error Messages / Log trace

npx tsx index2.ts
[2025-12-22 19:30:36.680 -0500] INFO: Launching local browser
category: "init"
Logging in as: 24mageejl
Login failed: UnsupportedModelVersionError [AI_UnsupportedModelVersionError]: Unsupported model version v3 for provider "google.generative-ai" and model "gemini-1.5-pro-latest". AI SDK 5 only supports models that implement specification version "v2".
at resolveLanguageModel (/home/jlmagee/webdev/stagehand/node_modules/@browserbasehq/stagehand/node_modules/ai/src/model/resolve-model.ts:16:13)
at generateObject (/home/jlmagee/webdev/stagehand/node_modules/@browserbasehq/stagehand/node_modules/ai/src/generate-object/generate-object.ts:216:17)
at AISdkClient2. (/home/jlmagee/webdev/stagehand/node_modules/@browserbasehq/stagehand/dist/index.js:62801:64)
at Generator.next ()
at /home/jlmagee/webdev/stagehand/node_modules/@browserbasehq/stagehand/dist/index.js:130:61
at new Promise ()
at __async (/home/jlmagee/webdev/stagehand/node_modules/@browserbasehq/stagehand/dist/index.js:114:10)
at AISdkClient2.createChatCompletion (/home/jlmagee/webdev/stagehand/node_modules/@browserbasehq/stagehand/dist/index.js:62747:12)
at /home/jlmagee/webdev/stagehand/node_modules/@browserbasehq/stagehand/dist/index.js:29232:41
at Generator.next () {
cause: undefined,
version: 'v3',
provider: 'google.generative-ai',
modelId: 'gemini-1.5-pro-latest',
Symbol(vercel.ai.error): true
}
[2025-12-22 19:30:43.100 -0500] INFO: ⏳ forcing completion of stalled iframe document
category: "dom"
url: "blob:https://www.brisnet.com/5bf51cb7-49f5-4ff4-b3f1-ce8a604d5bee"

[Paste error messages/logs here]

Screenshots / Videos

[Attach screenshots or videos here]

Related Issues

Are there any related issues or PRs?

• Related to: #[issue number]
• Duplicate of: #[issue number]
• Blocks: #[issue number]

[jlmagee]

This was caused by an incorrect configuration