To stop Claude from training on your chats, open Settings, go to Privacy and turn off "Help improve Claude." On Free, Pro and Max plans, the switch covers both regular chats and Claude Code. Team, Enterprise and API accounts aren't used for training by default.

The switch also changes how long Anthropic keeps your data. With it on, chats are kept for five years. With it off, they're kept for 30 days.

Claude Free, Pro and Max

Go to Settings, then Privacy, or open claude.ai/settings/data-privacy-controls.
Turn off Help improve Claude.
Use Incognito chat for anything sensitive. Incognito chats are never used for training, even if the switch is on.
Skip the thumbs up and thumbs down buttons on anything involving a client. Feedback is stored separately for up to five years.
Delete chats you don't need. Deleted chats aren't used for future training.
Don't create public share links for work chats.

Files and messages from connected sources like Google Drive aren't used for training unless you copy their content into the chat.

Claude Team, Enterprise and the API

Business plans and the Anthropic API don't train on your inputs or outputs by default. Standard retention is 30 days. Zero data retention is available to qualifying Enterprise organizations through Anthropic's account team.

A few settings can still send data back to Anthropic, so it's worth knowing where they are.

Setting	What we recommend
Development Partner Program	Leave it off. Joining lets Anthropic train on your organization's Claude Code sessions.
Thumbs up and thumbs down	Don't use them on client work. Feedback can be used for training and is kept for five years.
Claude Code sign-in	Sign in with your Team or Enterprise seat or an API key. A personal Pro or Max login puts your work code under consumer terms.
/feedback, /bug and /share in Claude Code	Don't send transcripts that include client code. They're kept for five years. Set `DISABLE_FEEDBACK_COMMAND=1` to block them.
"Can Anthropic look at your session transcript?"	Answer No or Don't ask again. Yes uploads the full session, code included.
Usage metrics and error reports	These don't include your code or prompts. To turn all of it off at once, set `CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC=1`.
Local session history	Claude Code keeps transcripts in plain text on your computer for 30 days. On shared machines, shorten that with the `cleanupPeriodDays` setting.

For a team, put these environment variables in Claude Code's managed settings file so every session picks them up without anyone needing to remember.

Frequently asked questions

Does Claude Pro train on my conversations?

Only if "Help improve Claude" is on. Check the setting yourself rather than assuming.

Does Claude Code send my source code to Anthropic for training?

Not on Team, Enterprise or API accounts. On a personal Free, Pro or Max account, it follows the "Help improve Claude" setting.

How long does Anthropic keep my chats?

On personal plans, five years with training on and 30 days with it off. Business plans and the API keep data for 30 days as standard.

Sources: Anthropic Privacy Center and Claude Code data usage.

Privacy guides for other AI tools

Last checked October 2026. AI companies rename and move these settings often, so if a menu looks different, search the app's settings for "training" or "improve".

How to stop Claude from training on your data