Show HN: Lumen – vision-first browser agent (state of the art, open source)
github.com
Problem
Browser automation is fragile. Scripts break constantly and agents waste tokens getting stuck in loops.
Today there are two options:
Selector-based scripting like Playwright and Puppeteer: these require you to target specific DOM elements.
First-generation browser agents (Stagehand, browser-use): use natural language interfaces but still resolve instructions into selectors under the hood.
Selector-based scripts can break every time the UI changes. You end up maintaining selectors instead of building features. First-gen agents inherit the same brittleness, especially when they misidentify the right element.
Solution:
Lumen is vision-first. It sees the screen and acts like a human. Every natural language instruction resolves into an x,y coordinate on the screen. Three layers of stuck detection keep it on track and a dual-history system with context compaction lets it handle 20+ step workflows without blowing up the context window.
We ran a WebVoyager eval (25 tasks across 15 sites, scored by LLM judge, 3 trials per task, all frameworks on Claude Sonnet 4.6):
Lumen: 100% success rate, 77.8s avg time, ~104K tokens.
browser-use: 100% success rate, 109.8s avg time.
Stagehand: 76% success rate, 207.8s avg time, ~200K tokens.
Lumen matches browser-use on accuracy while completing tasks ~30% faster, and beats Stagehand on every metric.
Get Started
Start using Lumen today:
Docs: https://lumen.omlabs.xyz/
Support us: GitHub star: https://github.com/omxyz/lumen