Gemini trains on chat history, even for subscribers
Archived — this story has rotated out of today’s deck. It is kept here in full.
The gist
A Hacker News poster said Google's Gemini uses saved chats for training even on paid plans, with no opt-out unless chat history is off.
The complaint targets paying customers and the lack of upfront consent, not the practice itself.
Background
Google operates the Gemini AI chatbot and publishes the Gemini Apps Privacy Hub, which documents how app activity is handled. Gemini Advanced is Google's paid subscription plan, listed at $19.99/month. The discussion centers on Google's Keep Activity setting, which both feeds training and human review and keeps chat history and memory features working; turning it off means chats vanish from Activity after 72 hours. The topic drew attention after a "Tell HN" post on Hacker News argued that a paid subscription does not exempt users from training.
How it unfolded
- Nov 4, 2026A "Tell HN" post titled "Gemini trains on chat history, even for subscribers (personal accounts)" is posted to Hacker News, stating that with a personal Google AI subscription all saved Gemini chat history can be used for training unless chat history is turned off or temporary chats are used.
- Nov 4, 2026The thread draws 3 comments at the time of the post, while other coverage reports it at 98 points and 33 comments.
- Nov 4, 2026explainx.ai publishes an analysis citing Google's Gemini Apps Privacy Hub (last updated October 26, 2026) confirming chats are used for training if Keep Activity is on and a subset is reviewed by humans, including trained service providers.
- Nov 4, 2026PromptZone reports data sharing for AI training is enabled by default for both free and paid Gemini users, including Gemini Advanced at $19.99/month, and that disabling it requires toggling off "Gemini Apps Activity" in Google Activity Controls.
- Nov 4, 2026emergent.sh publishes a piece stating Google Gemini uses saved chat history to train AI models by default for paid subscribers, with no opt-out without disabling chat memory entirely.
Who’s saying what
- Public
- HN poster jameslk said a paid subscription did not exempt users from training, writing "I learned this too late, thinking that having a paid subscription = not being turned into the product."
- Official
- Google's Gemini Apps Privacy Hub says app activity is used to improve Google services, including by training generative AI models, if the Keep Activity setting is on, and that a subset of chats is reviewed by human reviewers.
- Analysts
- PromptZone argued the community's core objection is not the practice itself but its application to paying customers and the lack of explicit, upfront consent.
- Caution
- HN commenter advenn said persistent memory requires Keep Activity on, which is why they do not use Gemini for anything serious or personal.
Still unverified
The HN poster's claim that there is "no way to opt out" is framed against Google's documented mechanism of turning off Keep Activity or using temporary chats.