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Index

Index is the SOTA open-source browser agent for autonomously executing complex tasks on the web. Check out the GitHub repo.

Powered by reasoning LLMs with vision capabilities

• Gemini 2.5 Pro/Flash
• Claude 3.7 Sonnet with extended thinking (top performing model)
• OpenAI o4-mini

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Local Quick Start

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Install dependencies

pip install lmnr-index

# Install playwright
playwright install chromium

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Run the agent with code

import asyncio
from index import Agent, AnthropicProvider

async def main():
    llm = AnthropicProvider(
            model="claude-3-7-sonnet-20250219",
            enable_thinking=True, 
            thinking_token_budget=2048)

    agent = Agent(llm=llm)
    prompt="Go to news.ycombinator.com, find a post about AI, and summarize it"

    output = await agent.run(
        prompt=prompt,
    )
    
    print(output.result)
    
if __name__ == "__main__":
    asyncio.run(main())

You can also run Index using the command line interface for an interactive experience.

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Use Cases

Index browser agent is ideal for:

• Web research and data collection
• Automated testing of web applications
• Content monitoring and summarization
• Competitive analysis and market research
• Customer support automation
• E-commerce operations

By combining the power of large language models with browser automation capabilities, Index enables you to perform sophisticated web-based workflows that previously required complex custom code.

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Next Steps

• Learn about the supported models for the Index browser agent
• Use the command line interface for interactive sessions
• Explore advanced configuration options for customizing the browser behavior
• Understand how to stream agent output in real-time
• Set up tracing and session replay for observability
• Use the Index API for serverless browser automation