Using these prompts/steering[0], setting Base style to Friendly, Warm to More, Enthusiastic to Default, Headers, Lists, and Emoji to Less, I have found I can get gpt-5.5 about ... 80% of the way there to writing as non-annoyingly as Claude. And it's so much faster and has such higher limits that that's worth it for me.

I also put together this ridiculous thing[1] because I missed the font and color scheme of Claude.

[0] https://gist.githubusercontent.com/dmd/91e9ca98b2c252a185e8e...

[1] https://github.com/dmd/aimpostor