Does Slack AI train on your data?

slack.com

Yes, by default, for recommendation features only. Slack says it analyses your messages, content and files to train its non-generative recommendation models (like emoji and channel suggestions) unless a workspace owner opts out. It says it doesn't train generative AI or LLMs on your data unless you opt in. As of 9 November 2026. Source: slack.com.

PolicyPeek gives Slack AI the badge "Trains by default, you can opt out". Its published policy allows training on your data by default, but describes a way to opt out. What we recorded from the policy: "We do not develop generative AI models using Customer Data. To develop predictive models for features such as emoji and channel recommendations, our systems analyse Customer Data (e.g. messages, content and files) submitted to Slack as well as Other Information (including usage information)" "If you want to exclude your Customer Data from helping to train Slack global models, you can opt out." "To opt out, please have your org, workspace owners or primary owner contact our Customer Experience team at feedback@slack.com with your workspace/org URL and the subject line 'Slack global model opt-out request'." "Slack will not use Customer Data to train generative AI models unless Customer provides affirmative opt-in consent." "Slack aggregates and disassociates Customer Data such that Slack's use of Customer Data to update the Services will never identify any of our customers or individuals as the source of any of these improvements to any third party, other than to Slack's affiliates or sub-processors." Security for AI features in Slack: "Customer data never leaves Slack-controlled infrastructure and is never used to train large language models (LLMs)." Global predictive-model training is on by default; the workspace-level opt-out must be requested by an owner. Slack does not distinguish free vs paid here. Sources have no page date; privacy principles fetched 8 November 2026 and re-checked 9 November 2026; Security for AI features fetched 9 November 2026. It doesn't state how long your data is kept. Last checked 9 November 2026 against 2 policy pages from slack.com.

Does Slack AI train on my data?

Two different things often get mixed up. Used to train models means your content helps build or improve the AI itself, so it can shape what the model produces later. Used to provide the feature means your content is processed to give you the answer, summary or suggestion you asked for, which any AI feature has to do. PolicyPeek's badge is about the first one only.

Used to train models: Yes, according to the policy
Used to provide the feature: Not rated by PolicyPeek; see the source

What Slack AI's policy says (slack.com):

We do not develop generative AI models using Customer Data. To develop predictive models for features such as emoji and channel recommendations, our systems analyse Customer Data (e.g. messages, content and files) submitted to Slack as well as Other Information (including usage information)
If you want to exclude your Customer Data from helping to train Slack global models, you can opt out.
To opt out, please have your org, workspace owners or primary owner contact our Customer Experience team at feedback@slack.com with your workspace/org URL and the subject line 'Slack global model opt-out request'.
Slack will not use Customer Data to train generative AI models unless Customer provides affirmative opt-in consent.
Customer data never leaves Slack-controlled infrastructure and is never used to train large language models (LLMs).

Can I opt out of Slack AI training?

What Slack AI's policy says about opting out:

If you want to exclude your Customer Data from helping to train Slack global models, you can opt out.
To opt out, please have your org, workspace owners or primary owner contact our Customer Experience team at feedback@slack.com with your workspace/org URL and the subject line 'Slack global model opt-out request'.

Check the current wording and steps on slack.com before you rely on them.

PolicyPeek hasn't recorded whether Slack AI's published policy mentions GDPR. PolicyPeek doesn't assess whether a tool meets GDPR; the badge only reports what the policy says about training.

In the UK: if personal data is involved, the UK GDPR applies to how it's used, including for AI. This page only reports what the vendor's published policy says about training — it is not a finding that Slack AI meets UK GDPR, and it is not legal advice. The Information Commissioner's Office publishes guidance on AI and data protection.

Common questions about Slack AI

Can I stop Slack AI training on my data?

Yes, but only a workspace owner can. They email feedback@slack.com to opt the workspace out of Slack's global recommendation models. Generative AI training only happens if your organisation opts in.

If I upload documents, are they used for training?

For Slack AI, the policy wording PolicyPeek recorded says: "We do not develop generative AI models using Customer Data. To develop predictive models for features such as emoji and channel recommendations, our systems analyse Customer Data (e.g. messages, content and files) submitted to Slack as well as Other Information (including usage information)" PolicyPeek's badge: "Trains by default, you can opt out".

How long does Slack AI keep my data?

Slack AI's published policy, as read by PolicyPeek, doesn't state how long your data is kept.

Does Slack AI's policy mention GDPR?

PolicyPeek hasn't recorded whether Slack AI's policy mentions GDPR.

How does Slack AI compare with other AI tools?

26 of the 65 AI tools PolicyPeek lists share Slack AI's badge, "Trains by default, you can opt out". See the related tools below or browse all tools.

What the policy says

Read from its own policy

Verdict: Trains by default, you can opt out

Their published policy says your data may be used for training unless you switch it off.

Why

"We do not develop generative AI models using Customer Data. To develop predictive models for features such as emoji and channel recommendations, our systems analyse Customer Data (e.g. messages, content and files) submitted to Slack as well as Other Information (including usage information)" "If you want to exclude your Customer Data from helping to train Slack global models, you can opt out." "To opt out, please have your org, workspace owners or primary owner contact our Customer Experience team at feedback@slack.com with your workspace/org URL and the subject line 'Slack global model opt-out request'." "Slack will not use Customer Data to train generative AI models unless Customer provides affirmative opt-in consent." "Slack aggregates and disassociates Customer Data such that Slack's use of Customer Data to update the Services will never identify any of our customers or individuals as the source of any of these improvements to any third party, other than to Slack's affiliates or sub-processors." Security for AI features in Slack: "Customer data never leaves Slack-controlled infrastructure and is never used to train large language models (LLMs)." Global predictive-model training is on by default; the workspace-level opt-out must be requested by an owner. Slack does not distinguish free vs paid here. Sources have no page date; privacy principles fetched 8 November 2026 and re-checked 9 November 2026; Security for AI features fetched 9 November 2026.

Trains on user data: Yes
Data retention: Not stated
GDPR mentioned: Unclear from policy
Last checked: 9 November 2026
Reviewed by a human: Yes