What Is DeepSeek? Usage, Pricing, and Safety Explained [2026]
A complete 2026 guide to DeepSeek — usage, pricing, safety, and Japanese language support. Includes comparisons with ChatGPT and real-world use cases.
"I keep hearing about DeepSeek — but is it actually good?" If that's the question on your mind, this guide covers everything: how to use DeepSeek, what it costs, and how safe it really is.
What Is DeepSeek?
DeepSeek is a large language model (LLM) created by the Chinese AI startup "DeepSeek" (深度求索). Its DeepSeek-V3, released in late 2024, and the reasoning-focused DeepSeek-R1 made global headlines for matching or surpassing GPT-4 and Gemini-level performance at a fraction of the cost.
Perhaps most striking is the fact that DeepSeek achieves this while overturning the assumption that "high-performance AI = high cost."
Key Features
1. Exceptional Cost Efficiency
- API pricing roughly 1/10 to 1/30 of OpenAI's
- Web app is completely free
- Can also run locally as an open-source model
2. Strong Reasoning Capability
DeepSeek-R1 is a reasoning-optimized model that performs Chain of Thought internally. It particularly excels at math, programming, and logical reasoning.
3. Open Source
The model weights are public, making it possible to run on your own server or PC. Data stays entirely on-premise, making it suitable for security-conscious use cases.
How to Use DeepSeek
Option 1: Web App (Easiest)
1. Go to [chat.deepseek.com](https://chat.deepseek.com) 2. Sign up with your email or Google account 3. Type your question and go
The web app is completely free and gives you access to both DeepSeek-V3 and R1. Enable "DeepThink" mode to activate R1 for deeper reasoning.
Option 2: API (For Developers)
1. Get an API key from [platform.deepseek.com](https://platform.deepseek.com) 2. The API is OpenAI-compatible, so existing code can be reused almost as-is
Migration is as simple as changing the base URL — you can use the OpenAI SDK directly.
Option 3: Local Execution (Privacy-First)
With Ollama, you can run DeepSeek on your own PC.
1. Install Ollama 2. Run `ollama run deepseek-r1:8b` in your terminal 3. Chat is available locally immediately
The 8B model runs on 16GB RAM. Since data never leaves your machine, this is ideal for handling sensitive information.
Pricing
| Plan | Price | Details |
|---|---|---|
| Web app | Free | Access to both V3 and R1 |
| API (DeepSeek-V3) | $0.27 / 1M input tokens | ~1/10 the price of OpenAI |
| API (DeepSeek-R1) | $0.55 / 1M input tokens | Reasoning-optimized model |
| Local execution | Free | Requires appropriate hardware |
Safety and Security
Security is the most common concern about DeepSeek. Here's a clear breakdown.
Risks to Consider
- Where data is stored: When using the web app or API, data is sent to servers in China
- Chinese regulations: Under China's National Intelligence Law, companies may be required to share data with the government
- Privacy policy: Input data may be used to improve the model
How to Reduce Risk
- Don't enter sensitive information: Never input personal data, trade secrets, or passwords
- Use local execution: With Ollama or LM Studio, no data leaves your machine
- Use the API instead of the web app: Clearer data management
- Limit use cases: Restrict to programming assistance, general questions, and learning
Practical Guidelines
For personal learning and programming help, DeepSeek can be used safely. Corporate use is fine as long as sensitive data is not involved. High-security situations call for local execution.
Japanese Language Support
DeepSeek's Japanese is at a practical level, though compared to ChatGPT and Claude, you'll notice some tendencies:
- Strong: Programming questions, math problems, technical explanations
- Weaker: Japanese-specific honorifics, creative writing, cultural context
For everyday questions and technical content, it's fully capable. For business writing or creative Japanese content, ChatGPT or Claude remains the better choice.
DeepSeek vs ChatGPT vs Claude
| Metric | DeepSeek | ChatGPT | Claude |
|---|---|---|---|
| Pricing | Free / cheap API | $20/month (Plus) | $20/month (Pro) |
| Reasoning | Very high | High | Very high |
| Japanese | Practical | Very high | Very high |
| Coding | Very strong | Strong | Very strong |
| Security | Caution needed | High | High |
| Multimodal | Text-focused | Image & audio | Image supported |
Recommended Use-Case Split
1. Coding practice and personal projects: DeepSeek (free and highly capable) 2. Business writing and Japanese content: ChatGPT or Claude 3. High-security workloads: Locally-run DeepSeek or Claude 4. Research and fact-finding: ChatGPT (web search) or Perplexity
Conclusion
DeepSeek is an excellent free, high-performance AI — especially for coding and math. That said, security awareness is essential. Match the access method (web app, API, or local) to your use case, and combine it with ChatGPT or Claude to get the best of what each has to offer. Start by trying the web app.