DeepSeek vs ChatGPT: How the two AI models differ in 2026

DeepSeek and ChatGPT are two of the most widely used AI chatbots, but they are built differently and suit different needs. The Chinese model DeepSeek is known for being cheap and "open source," while the American ChatGPT (from OpenAI) is more polished and has more features built in.

The biggest difference is price. According to comparisons, DeepSeek's newest model costs around $0.30 per million "input tokens" (chunks of text the AI reads) and $0.50 per million "output tokens" (text it writes). By comparison, OpenAI's GPT-5 costs about $2.50 for input and $10 for output, meaning up to ten times more expensive. That makes DeepSeek attractive for companies and developers who use AI at large scale.

DeepSeek is so-called open source, which means the code behind the model is publicly available. This makes it possible for companies to download the model and run it on their own servers instead of paying for access through a cloud service. ChatGPT, on the other hand, is closed source, and you depend on OpenAI's infrastructure.

On the other hand, ChatGPT has more features. It can understand images and charts, has a voice feature where you can talk to it, and works across many apps and programs. DeepSeek's newest model handles only text, both as input and output, even though there had been expectations that it would also be able to work with images.

When it comes to pure reasoning ability, the two models are close. On a recognized test of general knowledge (MMLU), ChatGPT's GPT-5.4 scores around 92.3 percent versus DeepSeek's 90.1 percent, a difference of under three percentage points.

In short: Choose DeepSeek if you want to save money, work with math or coding tasks, or want to run the AI on your own servers. Choose ChatGPT if you want a model that can handle images and speech and that works smoothly in many different apps.

What it means for you

If you need AI for many large tasks, DeepSeek can save you a tidy sum, and you can control where your data is stored yourself. If, on the other hand, you work with images, often talk to your AI, or just want something that works without hassle in your apps, ChatGPT is the obvious choice. If you are unsure, you can start by testing both on a concrete task and seeing what best fits your needs and your budget.