# Claude.ai home page uses prosemirror

**URL:** https://discuss.prosemirror.net/t/claude-ai-home-page-uses-prosemirror/8092
**Category:** Show
**Created:** [January 11, 2025, 11:22am UTC](https://discuss.prosemirror.net/t/claude-ai-home-page-uses-prosemirror/8092 "2025-01-11T11:22:56Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![mustafa0x](https://discuss.prosemirror.net/user_avatar/discuss.prosemirror.net/mustafa0x/32/1045_2.png) [@mustafa0x](https://discuss.prosemirror.net/u/mustafa0x)
#### Post date: [January 11, 2025, 11:22am UTC](https://discuss.prosemirror.net/t/claude-ai-home-page-uses-prosemirror/8092/1 "2025-01-11T11:22:56Z")

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I would argue this is perhaps this most user-facing prosemirror usage so far?

Funny thing, I guessed it was using PM when I started seeing it merging `\n`s when pasting ([I mentioned this bug / odd behavior back in 2019](https://discuss.prosemirror.net/t/new-lines-change-when-pasting-and-copying/2157)).

 ![image](https://discuss.prosemirror.net/uploads/secondsite/original/2X/2/21d0dc6d5cfae145abb5ab71352f6dc6ca202a14.jpeg)

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### Author: ![spaceemotion](https://discuss.prosemirror.net/user_avatar/discuss.prosemirror.net/spaceemotion/32/4178_2.png) [@spaceemotion](https://discuss.prosemirror.net/u/spaceemotion)
#### Post date: [January 12, 2025, 5:31pm UTC](https://discuss.prosemirror.net/t/claude-ai-home-page-uses-prosemirror/8092/2 "2025-01-12T17:31:16Z")

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Isn’t ChatGPT also using ProseMirror (and CodeMirror for their code stuff), too? At least the source code looks like they do:

 ![image](https://discuss.prosemirror.net/uploads/secondsite/original/2X/c/c94ea1602c2698524889e1be595d03c9bcc0b91e.png)

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### Author: ![abdelrahman](https://discuss.prosemirror.net/letter_avatar_proxy/v4/letter/a/b782af/32.png) [@abdelrahman](https://discuss.prosemirror.net/u/abdelrahman)
#### Post date: [January 12, 2025, 5:43pm UTC](https://discuss.prosemirror.net/t/claude-ai-home-page-uses-prosemirror/8092/3 "2025-01-12T17:43:32Z")

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Yes it’s

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### Author: ![annabialas](https://discuss.prosemirror.net/user_avatar/discuss.prosemirror.net/annabialas/32/4748_2.png) [@annabialas](https://discuss.prosemirror.net/u/annabialas)
#### Post date: [September 24, 2025, 6:29am UTC](https://discuss.prosemirror.net/t/claude-ai-home-page-uses-prosemirror/8092/4 "2025-09-24T06:29:35Z")

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I don’t think it’s a bug, handling \n can be refined via paste rules…