Jev Ultrafast is a browser agent from Type Safe that uses a dynamic, indexed action space to complete web tasks with minimal round trips. Given a single natural-language goal, it selects operations like CLICK, TYPE_TEXT, or SELECT from a small LLM, matching them to observed DOM elements without site-specific scripts. In a demo, it found Zürich to London flights on Google Flights in 7.1 seconds, including text generation and loading waits.

The system sends one request per decision cycle, sharing operation and target heads over the same observed state, and avoids screenshots in its default loop. Users can run it via git clone and uv sync, configuring API keys for models like inception/mercury-2.5, Gemini, or DeepSeek. The inspector displays numbered elements and probabilities, while Chrome connects through Browser Harness.

It supports tasks beyond flights, such as navigating Wikipedia, and validates targets by checking DOM context and geometry before input.