How to Use DeepSeek in 2026: Step-by-Step Guide
DeepSeek is a free AI chatbot from Chinese quantitative hedge fund High-Flyer that delivers GPT-4-class reasoning and coding performance at a fraction of the usual cost. Its DeepThink mode applies step-by-step chain-of-thought reasoning for complex problems, and its Mixture-of-Experts architecture means it was trained on far fewer GPUs than Western competitors — a fact that rattled the AI industry when it launched in early 2025.
DeepSeek is built by High-Flyer, a Chinese quantitative hedge fund that decided to compete with OpenAI and Anthropic — and succeeded. DeepSeek-V3 was trained using roughly 2,000 Nvidia H800 GPUs at an estimated cost of $5.6 million, compared to the $100 million-plus and 16,000+ GPUs that leading Western labs have committed to comparable projects. The announcement shook markets in January 2025: Nvidia shares dropped sharply as investors questioned the assumed requirement for massive GPU clusters.
The chat interface at chat.deepseek.com is completely free with no query limits on the web app. The flagship DeepThink mode (powered by DeepSeek-R1) applies visible chain-of-thought reasoning — the model shows its thinking process step by step before delivering a final answer. This is functionally comparable to OpenAI o1 and o3 models but costs nothing for consumer use. DeepThink mode excels at coding problems, competitive mathematics, multi-step logic puzzles, and research synthesis tasks.
DeepSeek-V3.2 uses a Mixture-of-Experts (MoE) architecture with 671 billion total parameters and approximately 37 billion active parameters per inference pass. The MoE design routes each query to specialized sub-networks rather than running the full model weight, which keeps inference costs low. The API starts at $0.14 per million input tokens — roughly 95% cheaper than GPT-4 Turbo — making it the most cost-efficient frontier-class API currently available for developers.
In coding benchmarks, DeepSeek-R1 matches or outperforms GPT-4 and Claude 3.5 Sonnet on several standard evaluations including HumanEval and LiveCodeBench. On AIME 2025, a competitive mathematics test, DeepSeek-R1 placed in the same tier as OpenAI o1. For coding-heavy or math-heavy workflows, DeepSeek is a credible free alternative to paid coding assistants.
Users should understand the privacy tradeoffs. Data is processed on servers in China, and the platform is operated by a Chinese company subject to Chinese data regulations. The US Navy, Italian data regulator, and several other government bodies have restricted or banned DeepSeek use on government devices. For personal use, research, and coding tasks without sensitive data, these concerns are manageable. For enterprise or regulated-industry workloads, users should review their compliance requirements before proceeding.
For developers, DeepSeek offers an OpenAI-compatible API, meaning existing code using the OpenAI Python SDK can switch to DeepSeek with minimal changes. The API supports function calling, JSON mode, and multi-turn conversations. File uploads and web search are available in the free chat interface. DeepSeek-R2 has been publicly discussed as the next generation and is expected later in 2026, though no official release date has been announced.
What You'll Need
- A DeepSeek account (free to create)
- A modern web browser or the DeepSeek app
Getting Started
Create Your Account
Visit https://chat.deepseek.com and sign up for a free account. You'll need an email address to register.
Start Your First Conversation
Once logged in, you'll see the main chat interface. Type a question or task in the input box and press Enter. DeepSeek supports text, code, search, file-upload — start with a simple text prompt to get familiar.
Natural Language Chat
Type your question or task in natural language. DeepSeek excels at understanding context and providing helpful, detailed responses.
Code Assistance
For coding help, paste your code or describe your problem: 'Here's my function, why isn't it working?' You can ask for explanations, debugging, or new code generation.
Real-Time Web Search
DeepSeek can search the web in real time. Ask about current events, recent news, or request up-to-date information that may not be in the model's training data.
File and Document Analysis
You can upload documents, PDFs, images, or spreadsheets for DeepSeek to analyze. Ask questions about the content or request summaries.
Pro Tips
- Be specific: The more context you provide, the better the response. Instead of "write an email," try "write a professional follow-up email to a client who hasn't responded in two weeks."
- Iterate: If you don't get what you need, ask for clarification or refinement: "Make it shorter" or "Use a more formal tone."
- Use examples: Show DeepSeek what format you want by including an example in your prompt.
- Share context: When asking for code help, include your programming language, framework, and what you're trying to accomplish.
- Analyze documents: Upload PDFs, reports, or data files and ask specific questions about the content.
- Save useful conversations: Most platforms let you name and revisit conversations — organize by project or topic.
Common Use Cases
General Assistant
All-purpose AI assistants for everyday questions, tasks, and conversations.
Browse General Assistant chatbots →Programming & Code
AI assistants focused on writing, debugging, and explaining code across programming languages.
Browse Programming & Code chatbots →Research & Analysis
Chatbots that help with data analysis, literature review, and in-depth research tasks.
Browse Research & Analysis chatbots →Troubleshooting
- Responses seem generic or unhelpful
- Add more context to your prompt. Specify the audience, tone, length, and format you need. Try starting over with a clearer description of your goal.
- The tool isn't responding or is slow
- AI chatbots can experience high traffic. Refresh the page and try again. Check the service's status page if issues persist.
- Output is too long or too short
- Explicitly specify the length: "in 100 words," "as a brief summary," or "in detail with examples."
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Frequently Asked Questions
- Is DeepSeek free to use?
- Yes, DeepSeek is completely free to use.
- Do I need an account to use DeepSeek?
- You may be able to try DeepSeek without an account, though a free account unlocks more features and saves your history.
- What can I use DeepSeek for?
- DeepSeek is a free AI chatbot from Chinese quantitative hedge fund High-Flyer that delivers GPT-4-class reasoning and coding performance at a fraction of the usual cost. Its DeepThink mode applies step-by-step chain-of-thought reasoning for complex problems, and its Mixture-of-Experts architecture means it was trained on far fewer GPUs than Western competitors — a fact that rattled the AI industry when it launched in early 2025.
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