Writing: Claude wins the draft, Gemini wins the revision
Claude produces the most natural, human-like writing and follows nuanced style instructions (tone, paragraph length, formatting) reliably, according to Parker Prompts and The Tech Girl. ChatGPT's writing tends to feel generic or flat unless carefully directed. You can coax better prose out of it, but Claude gets there on the first pass.
Gemini 3.1 Pro lands in the middle. Clean, but not matching Claude's natural voice.
One wrinkle: Claude's artifact feature no longer allows manual text editing, which undercuts its utility for collaborative writing. Gemini's Canvas, meanwhile, works as a full word processor with inline editing and formatting, the best collaborative writing tool of the three. So Claude wins the draft, Gemini wins the revision. And Claude's free tier is excellent for writing help, so non-paying users still get the best writer available.