DeepSeek is a strong free choice for math, logic and coding questions, and its models are open-weight, so you can even run them yourself. ChatGPT is the more complete assistant, with image generation, voice, mature file analysis and business plans that keep your data out of training. If privacy matters, the deciding factor is that DeepSeek’s hosted service stores data in China.
DeepSeek vs ChatGPT at a glance
| DeepSeek | ChatGPT | |
|---|---|---|
| Price for the chat app | Free | Free tier, Plus $20/month (US) |
| Strengths | Reasoning, math, code, low API cost | All-round, files, images, voice |
| Open weights | Yes | Not for ChatGPT’s models |
| Image generation | No | Yes |
| Data location (hosted service) | China, per its privacy policy | US, with business data controls |
| API cost | Very low per token | Higher for flagship models |
Reasoning and coding
DeepSeek drew wide attention in early 2025 when its reasoning model matched much more expensive models on math and coding benchmarks at a fraction of the cost. It remains a capable option for step-by-step problem solving and programming. ChatGPT’s reasoning models are at least as strong and come with tools like code execution and file handling that make them more useful for real projects. See best AI for coding.
Features beyond chat
ChatGPT has image generation, voice, memory, custom GPTs, projects and connectors to other apps. DeepSeek’s app is simpler: chat, web search, file reading and a visible reasoning mode. If you only need text answers, the gap matters less.
Privacy and compliance
DeepSeek’s privacy policy says it stores collected data on servers in the People’s Republic of China, and several governments and companies have restricted its use on work devices. For personal questions that contain no sensitive data, many people use it without issue. For anything involving clients, health or company information, use a provider with business data terms, or run DeepSeek’s open model locally so nothing leaves your machine. Our guide to open-source ChatGPT alternatives explains how.
Cost for developers
DeepSeek’s API is among the cheapest for its quality, priced per million tokens, which makes it popular for high-volume tasks like classification or summarization. ChatGPT’s consumer plans do not include API credits; OpenAI’s API is billed separately.
Which one should you choose?
Use DeepSeek for free help with math, logic and code when the content is not sensitive, or self-host it for full privacy. Use ChatGPT when you need a full-featured assistant or business-grade data handling. For the rest of the field, see the LLM comparison.
Frequently asked questions
Is DeepSeek better than ChatGPT?
DeepSeek is competitive on math, logic and coding, and its chat is free. ChatGPT is the more complete product, with image generation, voice, file analysis and stronger privacy options for work.
Is DeepSeek safe to use?
DeepSeek's privacy policy states that user data is stored on servers in China. Avoid entering personal, client or company data. Running DeepSeek's open models locally avoids sending data anywhere.
Is DeepSeek open source?
DeepSeek publishes the weights of its main models, recently under the MIT license, so developers can download and run them. The training data is not published.