Last verified: October 4, 2026
DeepSeek is a Chinese AI company and platform best known for building large language models, a consumer AI assistant, developer APIs, and open-weight model releases. People use the name “DeepSeek” in different ways: sometimes they mean the company, sometimes the chatbot app, sometimes the API, and sometimes a specific model such as DeepSeek-R1 or DeepSeek-V4.1-Flash.
The most important thing to understand is that DeepSeek is not just one model. DeepSeek-R1 was historically important, but R1 should not be treated as the current default DeepSeek API model unless current official API documentation explicitly says so. Current API work should be checked against DeepSeek’s official model and pricing documentation, where current model IDs such as deepseek-flash and deepseek-v4-pro are listed. DeepSeek Models & Pricing
For everyday users, DeepSeek usually means the AI assistant app or web chat. For developers, it usually means the API platform. For AI researchers and local-model users, it may mean open-weight releases such as DeepSeek-R1 or DeepSeek-V4.1-Flash. This guide explains each layer clearly so you do not rely on outdated R1-era information.
DeepSeek in one sentence
DeepSeek is an AI company and product ecosystem that offers a consumer AI assistant, a web chat experience, a paid developer API, and open-weight model releases for users, developers, researchers, and businesses.
Its official website links to DeepSeek Web, DeepSeek Harness, the API platform, API docs, app downloads, API pricing, service status, and research releases including DeepSeek V4.1, V4, V3.2, V3.1, R1, and V3. DeepSeek official website
What DeepSeek includes
DeepSeek is easier to understand if you separate its main layers: the company, the app, the web chat, the API, the model family, and the open-weight releases.
| DeepSeek layer | What it means | Who it is for | What to verify |
|---|---|---|---|
| DeepSeek company | The AI company behind DeepSeek models, services, and research releases. | Anyone trying to understand the brand or platform. | Use official DeepSeek pages and reliable reporting for company background. |
| DeepSeek app | The consumer mobile AI assistant listed in app stores. | Casual users, students, writers, and people who want a chatbot-style assistant. | Current app availability, account requirements, practical limits, and privacy settings. |
| DeepSeek Web | The browser-based chat experience at DeepSeek’s official web app. | Users who want DeepSeek in a desktop browser. | Login requirements, feature availability, and current service limits. |
| DeepSeek API Platform | A developer platform for calling DeepSeek models programmatically. | Developers, startups, backend teams, and AI product builders. | Current model IDs, token pricing, API features, and billing rules. |
| DeepSeek models | The underlying AI models, such as DeepSeek-R1 and DeepSeek-V4.1-Flash. | Users comparing capabilities or developers choosing a model. | Current model status, context length, supported features, and whether the model is hosted or open weight. |
| Open-weight releases | Model weights published for research, local inference, or third-party deployment. | Researchers, local-model users, infrastructure teams, and advanced developers. | License terms, model size, hardware requirements, and serving cost. |
| DeepSeek Harness | A DeepSeek product linked from the official site for agent or workflow-style use cases. | Advanced users and developers exploring agent workflows. | Current product documentation and whether it fits your workflow. |
What can you use DeepSeek for?
DeepSeek can be used for many of the same broad tasks people use AI assistants for: answering questions, writing, brainstorming, summarizing, coding help, translation, document analysis, reasoning, and technical explanation. The right product layer depends on what you are trying to do.
- Everyday users can use the app or web chat for general questions, writing help, study support, coding explanations, and everyday AI chat.
- Developers can use the API to build chatbots, agents, support tools, RAG systems, coding workflows, and internal automation.
- Researchers and local-model users can study or run open-weight models when the model card and infrastructure requirements fit their needs.
- Businesses can evaluate DeepSeek for cost-sensitive AI workloads, but should review privacy, legal, security, and vendor-risk requirements first.
Do not assume that features in the consumer app are identical to the API, and do not assume that an open-weight model behaves exactly like DeepSeek’s hosted web or app experience.
Is DeepSeek the same as DeepSeek R1?
No. DeepSeek-R1 is one important model family from DeepSeek, but DeepSeek is broader than R1.
DeepSeek-R1 was a major reasoning model release and remains available as open weights. The official DeepSeek-R1 model card on Hugging Face lists DeepSeek-R1 and DeepSeek-R1-Zero as large reasoning models and includes distilled variants based on Qwen and Llama families. DeepSeek-R1 model card
However, old articles or tutorials that treat R1 or deepseek-reasoner as the current default DeepSeek API route may be outdated. DeepSeek’s API changelog shows that deepseek-reasoner was introduced for R1, later upgraded, then moved through newer model generations and later treated as a legacy name. For new hosted API work, use the current model IDs in DeepSeek’s API documentation rather than copying old R1 examples. DeepSeek API Change Log
Current DeepSeek models and API status
DeepSeek model names change over time, so current model status matters. At the time this article was verified, DeepSeek’s API pricing page listed deepseek-flash and deepseek-v4-pro as current API model IDs. DeepSeek’s V4.1 Flash release also says V4.1 Flash is available through the model name deepseek-flash. DeepSeek Models & Pricing DeepSeek V4.1 Flash release note
| Model or name | What it means | Current practical note |
|---|---|---|
| DeepSeek-R1 | Historically important reasoning model family. | Still relevant as open weights, but do not treat it as the current default API model unless current docs say so. |
| DeepSeek-R1-0528 | Later R1 update from 2025. | Useful if you specifically want the updated R1-family open-weight release. |
deepseek-reasoner | Older API name associated with reasoning models. | Treat as a legacy name unless current API docs explicitly recommend it. |
| DeepSeek-V4.1-Flash | Current DeepSeek V4.1 generation Flash model. | DeepSeek says it improves text and agent performance and has native multimodal visual understanding. |
deepseek-flash | Current API model name for DeepSeek-V4.1-Flash. | Use this as the starting point for current hosted API work if it fits your task. |
deepseek-v4-pro | API model ID listed in DeepSeek’s pricing table. | Verify current routing and status before production use. |
| DeepSeek Thinking Mode | API-level reasoning behavior for supported current models. | Use current Thinking Mode documentation rather than old R1 prompting assumptions. |
The key takeaway: DeepSeek-R1 is not gone as a model family, but DeepSeek’s hosted API has moved through later generations. If you are building with the API, check DeepSeek’s current docs before choosing model names.
What is DeepSeek-V4.1-Flash?
DeepSeek-V4.1-Flash is a newer DeepSeek model release. DeepSeek’s official release note says V4.1 Flash improves text and agent performance, supports native multimodal visual understanding, and is available through the DeepSeek API as deepseek-flash. It also says older V4 Flash names were retired and temporarily routed to V4.1 Flash for compatibility. DeepSeek V4.1 Flash release note
The Hugging Face model card describes DeepSeek-V4.1-Flash as a multimodal Mixture-of-Experts model with 552B backbone parameters, image-and-text input support, and contexts of up to one million tokens. The same model card lists an MIT license for the repository and model weights. DeepSeek-V4.1-Flash model card
This is why a current “What is DeepSeek?” explanation should not stop at R1. R1 was important, but V4.1 Flash and deepseek-flash are central to the current hosted API conversation.
Is DeepSeek free?
DeepSeek is free in some contexts and paid in others.
The official Google Play listing for DeepSeek says users can interact with DeepSeek’s official AI assistant for free, and the Apple App Store listing displays the official app as free. DeepSeek on Google Play DeepSeek on the Apple App Store
The API is different. DeepSeek’s API is priced by token usage. The current pricing table uses per-1M-token pricing and separates cache-hit input, cache-miss input, and output tokens, with peak and off-peak rates. DeepSeek Models & Pricing
| DeepSeek option | Free or paid? | What it means |
|---|---|---|
| Official mobile app | Listed as free | Good starting point for casual users. |
| DeepSeek Web | May be free to access, but verify current product limits | Use the official web app and check current login and usage rules. |
| DeepSeek API | Paid | Developers pay based on token usage and model pricing. |
| Open-weight models | Weights may be available under license | Downloading weights is not the same as free hosted inference. |
| Self-hosting | Not free in practice | You pay for compute, storage, serving, monitoring, and operations. |
Is DeepSeek open source?
Use precise wording. Some DeepSeek model weights are openly available under model-card license terms, but that does not mean every DeepSeek product, app, API, training process, service, or dataset is fully open source.
For example, the DeepSeek-V4.1-Flash Hugging Face card says the repository and model weights are licensed under the MIT License. The DeepSeek-R1 model card also lists open-weight releases and license terms. DeepSeek-V4.1-Flash model card DeepSeek-R1 model card
A better phrase is usually open weights. Open weights can be valuable for research, evaluation, local inference, and controlled deployments, but they do not automatically make hosting cheap, easy, or free.
How does DeepSeek work at a high level?
DeepSeek works like other large language model systems at a high level: a user or application sends input, the model processes that input, and the system generates an output. Depending on the product, DeepSeek may also support reasoning behavior, tool calls, JSON output, long context, multimodal input, or context caching.
For developers, the API is the key layer. DeepSeek’s API docs describe OpenAI-compatible access, current model IDs, JSON Output, Tool Calls, Thinking Mode, Responses API, Anthropic API compatibility, and pricing. DeepSeek Models & Pricing
For users, the app and web chat hide most of those technical details. That is why you should not assume the consumer app exposes the same model names, controls, token pricing, or API features that developers see in the API docs.
DeepSeek for everyday users
For everyday users, DeepSeek is mainly an AI assistant. You can use it for general questions, brainstorming, summarizing, translation, study help, coding explanations, and writing support.
The official Google Play listing describes DeepSeek as an official AI assistant for free and says it is powered by DeepSeek’s flagship model. It also shows app data-safety disclosures, including that the app may collect location, personal information, and other data types, and may share device or other IDs with third parties. DeepSeek on Google Play
Use the official app or official web links rather than unknown third-party apps. A third-party app that uses DeepSeek may have different pricing, privacy terms, data handling, and limits.
DeepSeek for developers
For developers, DeepSeek is an API platform. You can call DeepSeek models from a backend service, automation workflow, chatbot, coding agent, document analysis system, or RAG pipeline.
DeepSeek’s pricing page lists the OpenAI-format base URL as https://api.deepseek.com and the Anthropic-format base URL as https://api.deepseek.com/anthropic. It also lists current models such as deepseek-flash and deepseek-v4-pro, with features including JSON Output, Tool Calls, Responses API, and Anthropic API support. DeepSeek Models & Pricing
The API is not free just because the consumer app is listed as free. Developers should budget for token usage, output length, context caching behavior, retries, and production monitoring.
DeepSeek for businesses
Businesses should evaluate DeepSeek differently from casual users. Model quality and low API cost are only part of the decision. Businesses also need to consider privacy, data location, legal terms, security review, procurement, vendor risk, and whether the use case involves regulated or confidential data.
DeepSeek’s Terms of Use say DeepSeek products and services are owned and operated by Hangzhou DeepSeek Artificial Intelligence Co., Ltd., and the Privacy Policy says the services are provided and controlled by that company. DeepSeek Terms of Use DeepSeek Privacy Policy
For low-sensitivity testing, a team may experiment with DeepSeek. For client data, employee data, medical, legal, financial, government, source-code-secret, or regulated data, businesses should get approval from legal, privacy, security, and compliance teams before using DeepSeek.
Privacy and data-use considerations
DeepSeek’s Privacy Policy is important for anyone planning to use the app or services with personal or sensitive information. The policy says it applies to DeepSeek apps, websites, software, and related services that link to it. It also says the services are provided and controlled by Hangzhou DeepSeek Artificial Intelligence Co., Ltd. DeepSeek Privacy Policy
The policy says DeepSeek may collect user input such as text input, voice input, prompts, uploaded files, photos, feedback, chat history, and other content provided to the model and services. It also lists automatically collected data such as IP address, device identifiers, operating system, system language, crash reports, performance logs, log data, and approximate location based on IP address.
The same policy says personal data may be stored on servers outside the user’s country and that DeepSeek directly collects, processes, and stores personal data in the People’s Republic of China. Users and organizations with strict data-residency, privacy, or vendor-risk requirements should treat this as a key review point.
Practical rule: do not paste passwords, API keys, access tokens, client data, patient data, legal documents, financial records, trade secrets, unreleased source code, employee records, student records, or regulated data into DeepSeek unless you understand the policy and have approval where needed.
Our DeepSeek safety guide helps distinguish low-sensitivity personal tasks from work or regulated-data uses.
How DeepSeek compares with ChatGPT, Claude, and Gemini
DeepSeek is often compared with ChatGPT, Claude, and Gemini because all four can function as AI assistants and developer model platforms. But each has a different product ecosystem.
| AI tool | Simple comparison point |
|---|---|
| DeepSeek | Known for low-cost API positioning, open-weight model releases, and current models such as DeepSeek-V4.1-Flash. |
| ChatGPT | OpenAI’s consumer and API ecosystem with broad recognition and many app/product integrations. |
| Claude | Anthropic’s assistant and API ecosystem, with strong app, writing, coding, and Claude Code positioning. |
| Gemini | Google’s AI assistant and API ecosystem, with strong Google Search, Android, Workspace, and multimodal integration. For the app, API, and integration differences, see our DeepSeek vs Gemini comparison. |
That does not mean one is always better. DeepSeek may be attractive for API cost, long-context workloads, and open-weight experimentation. Other tools may be stronger for product integrations, enterprise controls, media generation, coding tools, or user experience. The right choice depends on your use case.
Common misconceptions about DeepSeek
| Misconception | More accurate explanation |
|---|---|
| “DeepSeek is just R1.” | R1 is one important model family, but DeepSeek also has an app, web chat, API platform, V4.1 Flash, and other model releases. |
| “DeepSeek is one model.” | DeepSeek is a company/platform with multiple products and models. |
| “DeepSeek is completely free.” | The app may be free, but API usage is paid and self-hosting open weights costs compute. |
| “DeepSeek API is free.” | DeepSeek publishes token-based API pricing. |
| “DeepSeek is fully open source.” | Some model weights are open under model-card license terms; that is not the same as every product or dataset being open source. |
| “Open weights mean free hosting.” | No. Serving large models requires compute, storage, infrastructure, and maintenance. |
| “DeepSeek R1 is the current API default.” | Old R1-era names may be legacy. Current API work should use current model IDs from DeepSeek docs. |
| “DeepSeek app and DeepSeek API are the same thing.” | The app is for users; the API is for developers and has separate model names, pricing, and controls. |
| “DeepSeek stores data only in the U.S.” | DeepSeek’s Privacy Policy says it directly collects, processes, and stores personal data in China. |
| “DeepSeek is automatically safe for work data.” | Work use should be approved by the relevant legal, privacy, security, and compliance teams. |
Before using DeepSeek, check this
- Are you using the official DeepSeek app or a third-party app?
- Are you using the consumer app, web chat, API, or open weights?
- Are you relying on old R1 or
deepseek-reasonerinformation? - Do you need current API model names such as
deepseek-flash? - Do you need API pricing, token usage, or context-caching details?
- Are you entering sensitive personal, client, legal, financial, medical, source-code-secret, or regulated data?
- Do you need business approval before using the tool?
- Do you need open weights, hosted API access, or a managed app experience?
- Have you reviewed DeepSeek’s current Privacy Policy and Terms of Use?
Frequently asked questions
What is DeepSeek?
DeepSeek is an AI company and platform that offers a consumer AI assistant, web chat, developer API, model releases, and open-weight models. Depending on context, “DeepSeek” may refer to the company, app, API, or a specific model.
Is DeepSeek an app or a model?
Both, depending on context. DeepSeek has a consumer app and web chat, but it also publishes models and provides a developer API. DeepSeek-R1 and DeepSeek-V4.1-Flash are model names; DeepSeek App and DeepSeek Web are user-facing products.
Is DeepSeek the same as DeepSeek R1?
No. DeepSeek-R1 is an important reasoning model family from DeepSeek, but DeepSeek is broader than R1. It includes an app, web chat, API platform, model families, and open-weight releases.
Is DeepSeek free?
The official mobile app is listed as free in app stores checked for this article. The API is paid and uses token-based pricing. Open weights may be available under license terms, but running them still costs compute.
Is DeepSeek API free?
No. DeepSeek API usage is priced by token usage. Developers should check the current Models & Pricing page before building production workloads.
Is DeepSeek open source?
Some DeepSeek model weights are openly available under license terms, such as MIT for specific model cards. The more precise phrase is open weights. This does not mean every DeepSeek product, hosted service, training dataset, or infrastructure component is open source.
What is DeepSeek used for?
DeepSeek can be used for chat, writing, summarization, coding help, reasoning, translation, document analysis, AI agents, API integrations, research, and open-weight model experimentation.
What is DeepSeek-V4.1-Flash?
DeepSeek-V4.1-Flash is a newer DeepSeek model release. DeepSeek says it improves text and agent performance and supports native multimodal visual understanding. The API model name for it is deepseek-flash.
What is deepseek-flash?
deepseek-flash is the API model ID used for DeepSeek-V4.1-Flash in current DeepSeek API documentation checked for this article.
What happened to deepseek-reasoner?
deepseek-reasoner was an older API name associated with DeepSeek reasoning models, including R1-era usage. DeepSeek’s changelog later treated it as a legacy name, so new API projects should not rely on it unless current docs explicitly recommend it.
Can I use DeepSeek for coding?
Yes. DeepSeek can help explain code, write code, debug, analyze technical text, and power coding workflows through the API. For production coding agents, test it on your own codebase and measure quality, latency, cost, and safety.
Can developers use DeepSeek API?
Yes. DeepSeek provides an API platform with current model IDs, token pricing, OpenAI-compatible access, Anthropic-compatible access, JSON Output, Tool Calls, Responses API, and other developer features listed in its documentation.
Can businesses use DeepSeek?
Businesses can evaluate DeepSeek, but should review privacy, legal, security, procurement, and compliance requirements before using it with sensitive or regulated data.
Is DeepSeek safe?
There is no one-word answer. DeepSeek may be acceptable for low-sensitivity use if you understand the policy and product limits. For sensitive personal, business, legal, medical, financial, client, or regulated data, review the Privacy Policy and get organizational approval before using it.
Does DeepSeek store data in China?
DeepSeek’s Privacy Policy says personal data is directly collected, processed, and stored in the People’s Republic of China to provide the services.
How is DeepSeek different from ChatGPT?
Both are AI assistants and model platforms, but DeepSeek is especially associated with low-cost API pricing and open-weight model releases, while ChatGPT is part of OpenAI’s broader consumer and API ecosystem. The better choice depends on your workflow, privacy needs, integrations, and budget.
Bottom line
DeepSeek is best understood as an AI company and platform, not just a single chatbot or a single model. It includes a consumer app, web chat, API platform, model families, open-weight releases, and developer tools.
The most common mistake is treating DeepSeek as if it only means DeepSeek-R1. R1 remains important, but current DeepSeek API work should follow current official model IDs such as deepseek-flash when appropriate. If you are a casual user, start with the official app or web chat. If you are a developer, read the current API docs and pricing. If you are a business user, review privacy, data handling, and approval requirements before sending sensitive information.
Official sources checked
- DeepSeek official website
- DeepSeek Web
- DeepSeek API Platform
- DeepSeek Models & Pricing
- DeepSeek API Change Log
- DeepSeek V4.1 Flash release note
- DeepSeek-V4.1-Flash model card on Hugging Face
- DeepSeek-R1 model card on Hugging Face
- DeepSeek-R1-0528 model card on Hugging Face
- DeepSeek – AI Assistant on Google Play
- DeepSeek – AI Assistant on the Apple App Store
- DeepSeek Privacy Policy
- DeepSeek Terms of Use
- Reuters: High-Flyer, the AI quant fund behind DeepSeek