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What DeepSeek publicly says about API privacy
The February 10, 2026 English Privacy Policy applies to DeepSeek’s services. It is not a complete privacy policy for an application that a developer builds on the Open Platform. If your product sends a customer’s information to the API, your own privacy notice, legal basis, security controls, retention schedule and rights-handling process still apply to that downstream processing.
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| Question | What the public documents establish |
|---|---|
| Are prompts and logs collected? | Yes. The policy lists prompts and other supplied content, personal-data records about use of the service, device and network information, and crash or performance data. |
| How long are API prompts retained? | No fixed number of days is published. Retention varies with the data, purpose and legal requirements. |
| Are API prompts excluded from training? | No public API-wide no-training guarantee or user-facing opt-out switch is stated in the documents reviewed. |
| Where is data stored? | DeepSeek says it directly collects, processes and stores personal data in the People’s Republic of China. Storage outside a user’s country may also occur. |
| Can sensitive personal data be sent? | DeepSeek says its services are not designed or intended to process sensitive personal data and instructs users not to provide it. |
| Who handles privacy for an API application? | The developer remains responsible for downstream disclosures, lawful processing, security measures and end-user rights requests. |
Those statements answer the central privacy question: the public documentation does not support assuming that API data disappears immediately, stays outside model-improvement workflows, or remains in your preferred country.
What DeepSeek collects and logs
Prompt and content data
The policy says DeepSeek collects “text input, voice input, prompt, uploaded files, photos, feedback, chat history, or other content” supplied to its services. For an API integration, that can include the user message, system instructions, conversation history, uploaded document text, images, tool results and feedback your software forwards. A prompt can therefore contain substantially more information than the visible question in your interface.
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Usage, device and network records
DeepSeek also lists personal data about how people use the services, including features used and actions taken. The policy separately identifies device and network information, crash data and performance information. These records can be created even when a prompt itself contains no obvious identifier. They may be used to operate, secure, troubleshoot and improve the service, but the public policy does not provide an API-specific field-by-field log schedule.
The user_id field
The API reference warns: “Do not include user privacy information in the user_id.” DeepSeek describes this field as a way to distinguish identities for content-safety review and for KV-cache isolation used in privacy management. Use a random, internal identifier rather than an email address, phone number, account name, government identifier or any other directly identifying value. Keep the mapping between that random value and your customer in your own protected system.
Retention: what is known and what is not
There is no published numeric retention period for DeepSeek API prompts, outputs or logs. The policy says retention depends on the amount, type and sensitivity of personal data, the purposes for processing and legal requirements. That is a principles-based description, not a service-level deletion promise.
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| Policy factor | Practical meaning for an API customer |
|---|---|
| Providing the service | DeepSeek gives the example that account, input and payment data may be kept for as long as you have an account. |
| Contractual or legal duties | Data may remain while DeepSeek must meet an obligation imposed by a contract or law. |
| Legitimate business interests | The policy names improving services and safety, among other interests, as reasons data may be retained. |
| Legal claims | Records may be preserved when needed to establish, exercise or defend legal claims. |
| End of required use | When data is no longer required, DeepSeek and service providers say they will destroy, delete, erase or anonymize it as permitted or required by law. |
“As long as you have an account” is an example in the policy, not a universal promise that every API record lasts exactly that long. Conversely, the statement that data will eventually be deleted or anonymized does not specify when a particular prompt, backup, safety record or diagnostic entry will be removed. If your contract or regulator requires a precise deadline, obtain a product-specific written commitment before sending the data.
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Training and model improvement
The policy expressly lists using personal data “to improve and develop the Services and to train and improve our technology, such as our machine learning models and algorithms.” It also mentions monitoring interactions and analyzing use. That language means model improvement is a stated processing purpose for personal data collected through the services.
The public documents reviewed do not state a separate API no-training guarantee, a guaranteed exclusion of prompts from training, or a user-facing switch that turns this processing off. Do not describe your integration as “not used for training,” “zero data retention” or “no logging” unless you possess a current DeepSeek contract or product-specific statement that actually provides that control. A private setting in your own application cannot remove records already sent to the provider.
Sensitive prompts: what not to send
DeepSeek states that its services are “not designed or intended to process sensitive Personal Data.” The policy gives examples including racial or ethnic origin, religious beliefs, health information, sexuality, citizenship or immigration status, genetic or biometric data, children’s data, precise geolocation and criminal membership. It says DeepSeek does not ask for this information and that users should not provide it.
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Pre-send redaction procedure
- Classify the fields your product can place in a prompt, including hidden system context, retrieved documents, tool output, attachments and conversation history.
- Block or remove credentials, API keys, passwords, session tokens, payment details, government identifiers, health data, biometric data, children’s information and precise location.
- Replace necessary references with neutral tokens such as
USER_1842orORDER_7F3A. Keep the re-identification table inside your own access-controlled system. - Limit retrieval results to the minimum passages needed for the task. Do not send an entire customer record when a few non-sensitive fields answer the question.
- Log the redaction decision and the data category, not the original sensitive value. Test failure cases, including encoded secrets, screenshots and attached files.
Where DeepSeek stores API data
DeepSeek says: “To provide you with our services, we directly collect, process and store your Personal Data in People’s Republic of China.” It also says personal data may be stored on servers outside the country where the user lives and that safeguards may be used where applicable transfer law requires them.
This creates two separate questions for a compliance review: China is an expressly identified processing location, and additional locations may be involved. A user’s physical location, your company’s headquarters or the region selected in your application does not by itself change those statements. Check your transfer assessment, customer contracts and sector rules before sending data from a jurisdiction that restricts transfers or requires local hosting.
What developers must do
The Open Platform Terms place obligations on developers that offer a downstream application. You must explain your personal-information processing rules, obtain consent or another lawful basis where required, establish organizational and technical safeguards, and respond to end-user requests concerning access, copying, transfer, correction, erasure and retention. Those duties remain yours even when DeepSeek operates the underlying model endpoint.
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Keep API keys in a server-side secret manager or protected environment variable. The Open Platform Terms prohibit exposing keys in browser code or other client-side code. Route requests through your backend, enforce least-privilege access, rotate keys, monitor abnormal usage and revoke compromised credentials. Never place a key in a mobile binary, public repository, front-end JavaScript bundle or customer-visible prompt.
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Publish a downstream privacy notice
Tell users what information your product sends, why it is sent, the provider and countries involved, how long your own copies and logs are kept, how deletion works, and how users can exercise applicable rights. State clearly when a request may be processed by an external model provider. Your notice should distinguish your retention schedule from DeepSeek’s provider-side retention, which the public policy does not quantify.
Build deletion and access workflows
Map every copy of a request: browser or mobile telemetry, your application logs, queues, caches, vector indexes, prompt archives, backups and provider-side records. Define which copies you can delete directly and which require a provider request or contractual process. Document identity verification, response deadlines, exceptions for legal claims and the evidence that deletion was completed.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to reduce exposure in an API architecture
- Minimize: Send only fields required for the immediate inference.
- Pseudonymize: Use non-identifying internal IDs, especially in
user_id. - Separate secrets: Keep credentials and re-identification keys out of prompts and model context.
- Control logs: Disable full-body request logging in your own infrastructure where possible; log hashes, categories, latency and error codes instead.
- Set local deletion limits: Delete transient prompts, queue entries and debug traces on a documented schedule that matches your legal and operational needs.
- Restrict access: Apply role-based access, audit trails and encryption to any prompt data you must retain.
- Review vendors: Record the provider’s processing location, retention language, training terms, incident process and subprocessors in your vendor assessment.
- Test leakage: Use synthetic data to verify that prompts, attachments and tool outputs cannot bypass redaction.
How to compare DeepSeek with another API or self-hosted deployment
A meaningful privacy comparison is about documented controls, not a marketing label. Ask each option the same questions and keep the answer tied to a contract or current product documentation.
| Comparison axis | Question to verify | DeepSeek public-policy position |
|---|---|---|
| Retention | Is there a stated duration for prompts, outputs, backups and safety logs? | No numeric API duration is stated; retention varies by data, purpose and law. |
| Training | Are prompts and outputs excluded from model training by default or by contract? | No public API-wide exclusion or opt-out switch is stated. |
| Deletion and access | Can a customer or end user request deletion, export or access, and what is the process? | The policy describes legal and operational retention factors; it does not publish an API deletion timetable. |
| Storage geography | Which countries process or store data, including backups and support records? | China is expressly identified; storage outside the user’s country may also occur. |
| Logging and diagnostics | What request content, usage events, device data, crash data and performance data are recorded? | The policy lists supplied content, usage information, device/network data and crash/performance data. |
| Sensitive-data rules | Does the provider permit regulated or special-category information? | DeepSeek says its services are not designed or intended for sensitive personal data and tells users not to provide it. |
| Control of downstream processing | Who controls notices, lawful basis, security, rights requests and retention in the final product? | The developer is responsible for its downstream application and user obligations. |
A self-hosted model can give an organization direct control over network location, logs and deletion, but only if the organization operates those controls correctly. Another hosted provider may offer contractual zero-retention or regional processing; verify the exact plan and agreement rather than inferring it from a product name.
Common assumptions that are not supported
“The API is automatically zero-retention.”
Not established. The policy provides no fixed API retention period and describes several reasons data may be kept.
“API prompts are never used for training.”
Not established by the public documents. Model and technology improvement are listed processing purposes.
“Choosing an overseas server keeps data out of China.”
Not established. China is expressly identified as a processing and storage location, and additional locations may also be used.
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“Our privacy policy makes the provider compliant.”
Your notice is necessary but not sufficient. You still need a lawful basis, minimization, security, rights procedures and a provider arrangement that fits your obligations.
Pre-launch checklist
- Confirm that no prompt, attachment or tool result contains prohibited sensitive data.
- Use a random, non-identifying
user_id. - Keep the API key on the server, never in client-side code.
- Document China and any other applicable transfer locations.
- Record that no public numeric retention period or API-wide no-training guarantee is being relied upon.
- Publish a downstream privacy notice and lawful-basis explanation.
- Define access, correction, export, deletion and retention-request workflows.
- Set and test your own log-minimization and deletion schedules.
- Obtain written contractual controls before processing regulated information or promising zero retention.
For ordinary, non-sensitive text that has been minimized and pseudonymized, the API can be assessed through this documented-risk process. For health, biometric, children’s, immigration, criminal, financial-secret or similarly regulated material, do not send the raw data unless a separate legal and contractual review establishes controls that meet your requirements.
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