Cloud browsers
Browserbase
Cloud browser infrastructure that creates and manages browser sessions via API.
Train and evaluate browser agents
Train browser agents on real websites with Prime Intellect’s RL pipelines, powered by Browserbase.
How it fits together
Environment layer
BrowserEnv
Environment abstraction that wraps Browserbase sessions for evaluation and training.
Prime orchestration
Prime CLI and hosted training
Orchestrates evaluation runs and RL training loops at scale.
Two modes, one environment
DOM mode
Structured DOM content and high-level Stagehand instructions.
Best for: instruction-following tasks, form filling, and navigation Tools: navigate, observe, act, extract Command: prime eval run browser-dom-example
Run DOM exampleCUA mode
Screenshots and coordinate-based
Best for: visual, pixel-grounded tasks and complex UIs Tools: click, type_text, scroll, screenshot Command: prime eval run browser-cua-example
Run CUA example