OpenAI Codex 现可使用内置浏览器（IAB）在不同视口尺寸下测试应用，自动操作设备工具栏并在各断点点击验证与迭代。长时间测试时，Codex 会在关键节点截图并在回合结束时展示，供用户核验。它还能隐藏 IAB 以关闭动画，让测试速度提升 1-2 倍，同时标注功能发送更快、消耗 token 更少。
原文给出 Codex 用内置浏览器跨断点自测并回传截图的具体变化，读者可据此判断前端验证环节的可用性。
Codex can now use the in-app browser to test your app at different viewport sizes!
It will control the device tool bar and click through your app at different breakpoints to validate & iterate.
If it's a long run, Codex will take screenshots at key moments during testing and show them to you at the end of the turn, so you can verify its work.
To speed up testing, Codex can hide the IAB to disable animations, and accelerate testing by 1-2x.
Separately, we also made annotations send faster and consume less tokens.
Hope you enjoy the updates and let us know what you think!
Video
来源：@JamesZmSun · x.com