Comparison
ChatGPT vs DeepSeek
ChatGPT: The world's most popular AI chatbot, built by OpenAI. DeepSeek: Free, unlimited AI chatbot with very capable open-weight models.
| ChatGPT | DeepSeek | |
|---|---|---|
| Rating | 4.7 | 4.4 |
| Price | Freemium Plus plan from $20/month. Free plan available. | Free Free, unlimited chat. Pay-as-you-go API from $0.14 per million tokens. |
| Free plan | ||
| API available | ||
| Open source | ||
| In Spanish | ||
| No watermark | — | — |
| Platforms | Web · Windows · Mac · iOS · Android | Web · iOS · Android |
ChatGPT or DeepSeek?
This comes down to paying for convenience or paying nothing. DeepSeek offers free, unlimited chat with top-tier reasoning models, and its API costs a tenth of the competition. ChatGPT charges $20/month but gives you a complete ecosystem, polished apps and no doubts about where your data ends up.
Choose ChatGPT if…
You need image generation, voice or mobile apps, or you work somewhere the data policy matters.
Choose DeepSeek if…
You want high-level reasoning and coding without paying, or you are integrating AI by API and cost per token is your main constraint.
ChatGPT
- The most complete ecosystem: voice, images, file analysis
- Excellent in Spanish
- Apps for every platform
- The free plan has strict usage limits
- It can make up facts (hallucinations)
DeepSeek
- Completely free chat, with no daily limits or paywalled features
- Open-weight models you can run or audit yourself
- Extremely cheap API (~10x less than equivalent competitors)
- 'Server busy' notices at peak times
- Chinese company: its data policy raises concerns in corporate settings
The differences that actually matter
Where your data is processed
This is the decisive difference for professional use. DeepSeek is a Chinese company and its servers sit outside the EU, which complicates GDPR compliance if you handle customer data. ChatGPT offers enterprise terms, an option to exclude your data from training and processing agreements. For personal use it is irrelevant; for work involving third-party data, it is not.
The API cost is not remotely comparable
If you are integrating AI into a product, the price difference per million tokens between them is an order of magnitude. For a high-volume service with tight margins, that can be the difference between viable and not. Check it in our API cost calculator before settling on an architecture.
What surrounds the model
DeepSeek is essentially a chat. ChatGPT brings image generation, voice, memory across conversations, desktop and mobile apps, and a catalogue of custom assistants. If you only write and code you will not miss anything; if you expect the tool to fit into your daily routine, the gap is wide.
Frequently asked questions
Is DeepSeek safe to use?
For personal queries with no sensitive data, yes. For work involving client or company information the problem is not technical but legal: the data leaves the EU and that requires a legal basis you do not have by default. Its models can also be downloaded and run on your own infrastructure, which is the clean route if the cost appeals and privacy matters too.
Is DeepSeek really free and unlimited?
The web chat is free with no hard message cap, though at peak times it can be slow or refuse requests. The API is paid, but at a price far below the competition. The absence of a paid tier funding the service is also why you cannot expect the same availability commitment.