BU Ultrafast

Live on every Browser Use Cloud plan in the US, including free. Typical task: 22s, $0.006.

Medians of 12,238 completed runs across 134 projects, Oct 16-29, 2026. Browser and proxy are billed separately.

One line to switch.

POST https://api.browser-use.com/api/v4/runs
X-Browser-Use-API-Key: $BROWSER_USE_API_KEY

{ "task": "...", "model": "bu-ultrafast" }

Need more reasoning per step? Use bu-fast.