Introducing Glance, a fast browser agent trained with RL to test...
Morph@morphllm
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Jan 23, 2026
~1 min read
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Introducing Glance, a fast browser agent trained with RL to test code changes.
We're releasing this with BrowserBot, which puts a video of it testing your app right in your GitHub PRs
Frontier models are trained to be helpful. Our model is trained to be bad at using software.
We're releasing this with BrowserBot, which puts a video of it testing your app right in your GitHub PRs
Frontier models are trained to be helpful. Our model is trained to be bad at using software.
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Nobody reads PRs anymore.
AI writes 5000 lines. Reviewer scrolls for 10 seconds
We embed a video of an agent actually using your app's preview URLs right in the PR. Now you can watch instead of pretend to read.
AI writes 5000 lines. Reviewer scrolls for 10 seconds
We embed a video of an agent actually using your app's preview URLs right in the PR. Now you can watch instead of pretend to read.
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Why train this? We turn code testing into a search problem – searching for components that changed via browser tools.
The hard part is grounding. A diff in Button.tsx doesn’t tell you where that button lives or how to reach it.
We walk React’s Fiber tree to map changed files → DOM elements → bounding boxes.
Given any diff, we know exactly which pixels need testing. Tools like Bippy and react-grab from @aidenybai were useful starting points.
The hard part is grounding. A diff in Button.tsx doesn’t tell you where that button lives or how to reach it.
We walk React’s Fiber tree to map changed files → DOM elements → bounding boxes.
Given any diff, we know exactly which pixels need testing. Tools like Bippy and react-grab from @aidenybai were useful starting points.
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The reward:
• Δ coverage when changed component enters viewport
• 2x reward for interacting with it
• Reward for novel state discovery
• Δ coverage when changed component enters viewport
• 2x reward for interacting with it
• Reward for novel state discovery
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Read more about how we trained it:
morphllm.com/blog/browser-v…
and install our PR bot for free here
(Works with Vercel, Cloudflare, Render, and more)
morphllm.com/dashboard/inte…
morphllm.com/blog/browser-v…
and install our PR bot for free here
(Works with Vercel, Cloudflare, Render, and more)
morphllm.com/dashboard/inte…
