Quick Answer
When you use hosted Kimi, your prompts, files, and generated responses are processed to provide and improve the service, and Kimi help centre says the platform may use input data, instructions, and generated responses for model training, provided the data is processed with secure encryption and de identified so it cannot be re identified to a specific individual. You can opt out of training use by contacting customer support, with registration completed within 5 to 7 working days after identity verification, and opting out does not affect your access. Kimi says it does not share, sell, or provide your personal conversation data to third parties without your consent, a legal requirement, or a need to provide product features. The safe rule is still simple: do not paste sensitive personal data into Kimi, and read the current privacy policy for the exact plan and region you use.
What Data Does Kimi Collect?
According to Kimi privacy explanations, user content includes prompts, audio, images, videos, files, and generated content. That is the material you send and the material Kimi creates in response. In addition, like most online services, Kimi collects log data, device and usage information, conversation and session identifiers, and cookies or local storage data. Those extra categories help run the service, fix bugs, and understand how features are used.
It helps to separate two kinds of data. The first is what you type or upload, which is the most sensitive, because it can contain personal details, work documents, or private ideas. The second is technical data about how you use the service, such as device type and session timing, which is less sensitive on its own but can still reveal patterns. Both are covered by the privacy policy, but your main control should focus on the first kind: what you choose to paste in the first place.
Will My Chats Be Used for Training?
This is the question most users care about, and Kimi answer is direct. Its help centre page on data usage asks, “Will my conversation data be used for model training?” and answers that, provided data is processed with secure encryption technology, strictly de identified, and cannot be re identified to a specific individual, the platform may use users input data, instructions, and generated responses for model training to optimise model performance and product experience.
De identification means removing direct identifiers before training use, but it does not mean your chat is never stored or never seen by systems that run the service. It also does not guarantee that a unique detail in your prompt could never be recognised from context. That is why the practical advice is to avoid pasting anything you would not want stored, even with an opt out in place.
Recent comparisons also note a difference between plans. One comparison reported that Kimi privacy policy lists prompts and files as content used for training and optimising, and does not describe a way to switch that off in the product itself, while the Business plan is advertised with no training on your data by default. That detail may change, so check the current plan description if business use matters to you, rather than relying on a general summary.
How to Opt Out of Training Use
Kimi help centre gives a clear opt out route. If you do not want your conversation data to be used for training, you can contact customer support and submit a request. Kimi says it will complete the opt out registration within 5 to 7 working days after verifying your identity, and will stop using your content for model training.
After opting out, the scope is account level. Per conversation or per file opt out is not currently supported. Opting out does not affect your continued access, your account, your membership benefits, or your conversation history. Once registration is complete, neither your historical conversation data nor any newly generated data will be included in the model training dataset, according to the help page.
Does Kimi Share My Chats With Third Parties?
Kimi help centre states that without your consent, a legal requirement, or the necessity to provide product features, it does not share, sell, or provide your personal conversation data to any third party, including affiliates, partners, or advertisers, nor does it use it for purposes unrelated to providing the service. For full details, it points readers to section 4.2 of the Kimi Privacy Policy.
That wording leaves room for service providers who help run the product, for legal requests, and for features that need a third party to work. That is normal for a cloud service, but it means “not shared” does not mean “never leaves Moonshot systems.” If a feature uses an external tool, such as web search or a connected service, some data may need to go to that tool for the feature to work. Check the feature description before using it with sensitive material.
Another sharing question is about law. Moonshot is based in Beijing, and its help centre and comparisons mention Chinese data laws, including the Cybersecurity Law and the Personal Information Protection Law, in the context of data kept after account deletion. Laws and retention rules can differ by region and by the entity that operates the service for you, so if you work in a regulated industry, get advice based on your actual account and region, not on a general blog summary.
What Happens When I Delete a Chat or My Account?
Deleting a chat usually removes it from your visible history, but it does not always mean every copy is instantly erased from backup or legal retention systems. Kimi help centre and comparisons note that some data may be kept after account deletion as required by law. That is common for online services, but it is an important reason not to treat deletion as a safety net for sensitive data you should never have pasted in the first place.
If you need to remove a chat, delete it in the app, then check whether it is gone from all devices after syncing. If you close an account, follow the official deletion process and keep any confirmation. If the material was highly sensitive, assume a copy may remain in retention for a period, and take advice on what that means for your situation, rather than assuming deletion solves the problem completely.
Is Open Weight Kimi More Private?
Open weight models create a different privacy story, but they do not automatically solve privacy. If you download Kimi weights and run the model on your own hardware, with no web search, no cloud connectors, and no telemetry, then your prompts do not need to leave your machine. That is a real privacy advantage for organisations that can run large models themselves.
But most users will not do that, because running a multi trillion parameter model needs serious hardware. And even a locally loaded model can send data outward if its surrounding tools do: web search, browser control, cloud file connectors, crash reporting, or external model fallbacks can all leak data, even when the model itself runs locally. Privacy depends on the whole setup, not just on whether the weights are open.
For everyday users, the practical privacy choice is simpler: use the hosted app with care, use the opt out if you want it, and keep sensitive data out. For companies, the choice is between hosted use with a business plan and controls, API use with its own terms, or self hosting with proper network controls. Each path needs its own review.
Safe Habits for Using Kimi
First, never paste passwords, bank details, ID numbers, medical records, or other sensitive personal data into Kimi or any chatbot. Second, remove names, addresses, and identifying details from work documents before uploading them, when you can do so without losing the meaning. Third, use the training opt out if you do not want your chats used for training, and keep the confirmation.
Fourth, be careful with agent features. Agent modes can browse, use tools, and act across tabs or files. Before you run an agent task, check what permissions it has, what files it can access, and whether it will use your logged in sessions. Fifth, review your saved chats regularly and delete ones you no longer need. A smaller history is easier to manage and less risky if an account is ever compromised.
What We Learned About AI Privacy
We learned that privacy is mostly decided before you press send, not after. Opt outs, deletions, and settings help, but they cannot fully undo a sensitive paste. The habit that protects you most is pausing for two seconds and asking: would I be comfortable if this chat were stored and read by a stranger? If the answer is no, do not paste it.
We also learned to read the help centre page, not just the marketing page. Marketing pages talk about security in general terms. Help centre and privacy policy pages talk about training, sharing, retention, and opt outs in specific terms. Those specifics are what actually govern your data.
Frequently Asked Questions
Can I stop Kimi from using my chats for training?
Yes, by contacting customer support to request an account level opt out. Kimi says registration is completed within 5 to 7 working days after identity verification.
Does opting out delete my chats?
No. Kimi says opting out does not affect your account, membership benefits, or conversation history.
Does Kimi sell my conversation data?
Kimi says it does not share, sell, or provide personal conversation data to third parties without consent, a legal requirement, or a need to provide product features.
Is Kimi safe for business documents?
It depends on the document, the plan, and your company policy. Check the business plan terms, use the opt out where relevant, and avoid pasting confidential or regulated data into a consumer chat account.
What should I never paste into Kimi?
Passwords, financial details, ID numbers, medical information, private contracts, and any data you are not allowed to share. Use redacted or practice versions for testing.
Final Takeaway
Kimi hosted chats may be used for training after de identification unless you opt out through support, and Kimi says it does not sell your personal conversation data without consent, a legal requirement, or a product need. Those are the core facts, but the safest approach remains the same: keep sensitive data out, use the opt out if you want it, check permissions for agent features, and read the current privacy policy before you use Kimi for work that matters.
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Sources: Kimi help centre, data usage and sharing, Kimi privacy and training comparison, Hosted Kimi privacy and self hosting distinction.
