Index – New Open Source browser agent
Hey HN, Robert from Laminar (lmnr.ai) here. We built Index - new SOTA Open Source browser agent. It reached 92% on WebVoyager with Claude 3.7 (extended thinking). o1 was used as a judge, also we manually double checked the judge. At the core is same old idea - run simple JS script in the browser to identify interactable elements -> draw bounding boxes around them on a screenshot of a browser window -> feed it to the LLM. What made Index so good: 1. We essentially created browser agent observability. We patched Playwright to record the entire browser session while the agent operates,…
Index – New Open Source browser agent launched on April 23, 2025 with 98 votes, #497 of 7,818 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 1 year on.
In plain words
Index is an open-source browser automation agent that uses language models to interact with web interfaces. It identifies clickable elements on web pages, displays them with bounding boxes on screenshots, and sends this visual information to an LLM for decision-making. The tool includes built-in session recording and debugging features that let developers see exactly what the agent observes and trace each step of execution. Index achieved 92% accuracy on the WebVoyager benchmark and is designed for developers building web automation workflows.
written from the facts on this page · September 2026
From the sources
The SOTA Open-Source Browser Agent for autonomously performing complex tasks on the web - lmnr-ai/index
Index Index is a state-of-the-art open-source browser agent that autonomously executes complex web tasks. It turns any website into an accessible API and can be seamlessly integrated with just a few lines of code. prompt: go to ycombinator.com. summarize first 3 companies in the W25 batch and make new spreadsheet in google sheets. pip install lmnr-index ' lmnr[all] ' # Install playwright playwright install chromium Setup model API keys Setup your model API keys in .env file in your project root: GEMINI_API_KEY= ANTHROPIC_API_KEY= OPENAI_API_KEY= # Optional, to trace the agent's actions and record browser session LMNR_PROJECT_API_KEY= Run Index with code import asyncio from index import…from github.com
In the maker’s words, at launch
Hey HN, Robert from Laminar (lmnr.ai) here. We built Index - new SOTA Open Source browser agent. It reached 92% on WebVoyager with Claude 3.7 (extended thinking). o1 was used as a judge, also we manually double checked the judge. At the core is same old idea - run simple JS script in the browser to identify…
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