DeepSeek, a Chinese AI lab based in Hangzhou, shocked the industry by releasing powerful models that matched leading Western systems on many reasoning benchmarks while being much cheaper to run, and by publishing the model weights openly. ChatGPT remains the most popular AI assistant in the world, with far more features. So which should you use?
Short answer: ChatGPT is the better product for most people: more features, better integrations and stronger data protections for business use. DeepSeek is impressive for free reasoning and coding help, and its open-weight models are excellent for developers who want to self-host. If privacy or compliance matters, be cautious about DeepSeek’s hosted app.
DeepSeek vs ChatGPT at a glance
| DeepSeek | ChatGPT | |
|---|---|---|
| Company | DeepSeek (China) | OpenAI (USA) |
| Price for chat app | Free | Free plan; paid Go, Plus, Pro |
| Open weights | Yes, many models downloadable | Some open-weight models; ChatGPT models are closed |
| Reasoning mode | Yes (“DeepThink”) | Yes (thinking models) |
| Image generation | No | Yes |
| Voice mode | Limited | Advanced voice |
| File analysis | Text extraction from files and images | Full file analysis with code execution |
| Agents and integrations | Minimal in app | Agent mode, connectors, Codex, GPTs |
| Data storage | Servers in China per its privacy policy | US-based, with business data controls |
| API price | Very low | Higher, varies by model |
Reasoning and maths
DeepSeek’s reasoning models were among the first to show their step-by-step thinking openly, and they perform very well on maths, logic puzzles and competitive programming. ChatGPT’s thinking models are generally at least as strong and often stronger on the hardest problems, and they combine reasoning with tools such as web search and code execution. For a student checking calculus homework, both are excellent. For complex multi-step work that needs data or browsing, ChatGPT wins.
Coding
DeepSeek is a capable coding assistant and its API is popular in budget-conscious coding tools because it is so cheap. ChatGPT offers Codex, a full coding agent that can work across your repository, run tests and open pull requests. If you just need code snippets, DeepSeek is a great free option. For agentic development, ChatGPT (or Claude Code, see Codex vs Claude Code) is far more capable.
Writing
ChatGPT generally produces more natural, varied English and follows tone instructions better. DeepSeek writes clearly and is very good in Chinese. For marketing, creative writing and editing, ChatGPT or Claude are usually better choices.
Features
This is where the gap is biggest. ChatGPT includes image creation, voice conversations, deep research, projects, memory, custom GPTs, app connectors, agent mode and a desktop app. DeepSeek’s app is a focused chat experience with web search and a reasoning toggle. If you want an all-in-one assistant, ChatGPT is the clear winner.
Cost
DeepSeek’s chat app is free, and its API is among the cheapest of any frontier-class model, which is why many developers use it for high-volume tasks. ChatGPT has a capable free plan, but heavy users pay for Go, Plus or Pro. For businesses processing millions of tokens, DeepSeek’s API (or self-hosting its open weights) can cut costs dramatically.
Privacy and security
DeepSeek’s privacy policy states that data is stored on servers in China, and several governments and companies have restricted its app on official devices because of data security and censorship concerns. The hosted app also avoids or filters some politically sensitive topics.
The open-weight models are a different story: if you run DeepSeek models on your own hardware or through a Western cloud provider, your data does not go to DeepSeek. ChatGPT offers data controls, and its Business and Enterprise plans exclude data from training by default.
Rule of thumb: do not paste confidential business, client or personal data into any consumer AI app, and especially not into apps whose data practices your organisation has not approved. See our guide to using AI safely.
Who should use DeepSeek?
- Students and hobbyists who want strong free reasoning help.
- Developers who need a very cheap API for non-sensitive tasks.
- Teams that want to self-host an open-weight model for privacy and control.
- Chinese-language users.
Who should use ChatGPT?
- Anyone who wants an all-in-one assistant with images, voice and research.
- Businesses that need admin controls, compliance and data protection.
- Developers who want an agentic coding tool.
- Writers and marketers who need polished English.
Other options to consider
If you like DeepSeek’s openness, try other open models such as Qwen, Mistral or Llama through services you trust. If you want a ChatGPT-level assistant with a different style, see Claude vs ChatGPT, Grok vs ChatGPT or our full list of ChatGPT alternatives.
FAQ
Is DeepSeek better than ChatGPT?
DeepSeek is competitive on reasoning and coding and is free, but ChatGPT is a more complete product with better features and data protections.
Is DeepSeek free?
Yes, the DeepSeek chat app is free. The API is paid but very inexpensive.
Is DeepSeek safe to use?
Use caution. Hosted data is stored in China and some organisations ban the app. Running open-weight models yourself avoids sending data to DeepSeek.
Can I run DeepSeek locally?
Yes. Smaller distilled versions run on consumer hardware through tools such as Ollama or LM Studio; the full models need powerful servers.
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