{
  "id": 19237450,
  "title": "browser-use publishes the first usable 1.0 release candidate with a rewritten Python engine",
  "url": "https://urgent.news/2026/11/09/browser-use-publishes-the-first-usable-1-0-release-candidate-with-a",
  "topic": "tech",
  "section": "Tech",
  "published": "2026-11-09T23:01:23.000Z",
  "source": {
    "name": "Dev.to",
    "slug": "dev-to",
    "url": "https://dev.to/delimitter/browser-use-publishes-the-first-usable-10-release-candidate-with-a-rewritten-python-engine-1kb5"
  },
  "original_language": "en",
  "account": null,
  "summary": "GitHub's browser-use project has released a release candidate 1.0.0rc4 of their open-source browser automation tool, marking the first usable version with a rewritten Python engine. The release candidate boasts a significantly reduced codebase, shrinking from 68,815 to 13,154 lines of Python, and introduces a persistent REPL with browser-harness helpers and raw CDP available in the same session. The core API has been preserved, but new defaults have changed post-install behavior, with llm=None routing to the bu-fast model on the Browser Use gateway. The release candidate also features tighter run limits, a single BROWSER_USE_API_KEY, and Python 3.11 or newer as a requirement. Performance improvements are notable, with the 1.0 ultrafast mode scoring 62.6 on BU Bench v2 at a cost of 0.071 dollar per task and 585 seconds per task. The rollout notes indicate that rc1 through rc3 did not reach PyPI, so plain pip install browser-use still installs 0.13.14 until 1.0.0 ships.",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}