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Regarding Claude: As I have unticked the "Help improve Claude" checkbox, I was under the impression that Claude did not do this.

You can opt out with all three (Codex, Claude, Copilot) except for Gemini

Last time I checked Codex didn't have that option for $20 plan

> except for Gemini

This is incorrect. If you are a paid subscriber, Gemini explicitly states it doesn't use your data to train its models.

Yeah you're right, I filed it away as no opt out for some reason

Maybe because Google "does not sell" personal information, yet almost all their revenue comes from personal information?

They sell aggregated information.

And targeted information.