What is DeepSeek?
DeepSeek is an AI company offering a consumer chat service, mobile apps, models, research releases, and a developer API. Its official app materials describe free chat with reasoning, web search, file upload, and synchronized history. The API is a separate usage-based product for developers.
It is important to distinguish these layers. The hosted chat experience is not the same thing as downloading an openly released model, and the consumer app's price or data policy does not automatically apply to API use or a self-hosted deployment. Evaluate the exact product you intend to use.
Core DeepSeek workflows
The consumer chat can support questions, drafting, summarization, problem solving, and coding assistance. Reasoning-oriented modes are often used for mathematics, planning, or technical analysis. A visible reasoning process can help a reader inspect the approach, but it is not proof that the answer is correct. Check calculations, assumptions, and source material independently.
Web search can help with current information. DeepSeek's terms state that enabling search may improve answer accuracy, but any generated synthesis can still omit context or rely on weak sources. Open the source, check its date and authority, and avoid using a generated answer as the citation.
File upload and text extraction are useful for summarizing or questioning a document. Before relying on the output, ask known-answer questions and inspect whether the assistant handles tables, footnotes, and exceptions. Do not upload confidential material until the privacy and organizational context has been approved.
Mobile apps provide cross-device history and official access outside the browser. DeepSeek advises users to download only through official channels because imitations can create security risks.
API and pricing context
DeepSeek's consumer app announcement describes the app as free. The developer API uses separate token-based billing, with current rates published in the official API pricing documentation. Model names, context sizes, prices, and deprecation dates can change, so an integration should read current documentation rather than hard-code assumptions from an old review.
For consumer use, free access is an opportunity to test instruction following and output quality. For API use, calculate cost from representative input and output sizes, caching behavior, retry patterns, and the model chosen. Also evaluate rate limits, service availability, data terms, and migration work if a model identifier changes.
Privacy and data considerations
The DeepSeek Privacy Policy states that the service may collect account details, prompts, voice inputs, uploaded files, photos, feedback, chat history, device information, and usage data. It also describes using data to provide, secure, develop, and improve services and models. The policy includes user rights and an opt-out right for use of personal data in model training or technology optimization, subject to applicable law and process.
DeepSeek also says the services are not designed for sensitive personal data and advises users not to provide it. Search features may send input keywords to third-party search providers. Shared conversation links can expose dialogue to anyone with access and may later be discovered outside the intended audience.
These are material considerations, not a footnote. Review where your organization permits data to be processed, whether the consumer product is approved, how account deletion and chat history work, and whether the API has different terms. Do not enter customer, health, legal, financial, identity, or secret business information without explicit approval.
Open models and hosted service
DeepSeek publishes research and model information through its official website and transparency materials. Some releases have open weights or permissive licenses, but license terms vary. “DeepSeek is open source” is too broad to be a reliable purchasing statement. Check the exact model card, code repository, license, and deployment stack.
Self-hosting a model can change data control, but it also transfers responsibility for security, updates, evaluation, moderation, infrastructure, and compliance to the operator. It should not be confused with using the hosted DeepSeek chat.
Strengths and limitations
DeepSeek's strengths are accessible consumer use, reasoning-oriented workflows, and a developer ecosystem with published technical and pricing information. It is useful for comparison and for teams willing to evaluate a separate model provider.
Its limitations include privacy and jurisdiction questions that may matter to individuals and organizations, plus the universal risk of inaccurate generated output. Model and API changes can also make old implementation guides obsolete.
Who should choose DeepSeek?
DeepSeek is worth evaluating for users seeking free reasoning and for developers comparing model APIs. Compare Mistral Vibe for unified productivity and coding, ChatGPT or Claude for broad mature assistant workflows, and Perplexity when visible web citations are the central requirement.
Visit the official DeepSeek chat website
