Summary: We tried several queries on both chatGPT and DeepSeek. Here are some results, there are startling similarities between the two over several queries, and we here present some of the queries. All this was to check if OpenAI claim that DeepSeek used OpenAI model — here in reference [1], “Microsoft-backed OpenAI has accused Chinese competitor DeepSeek of using its proprietary models to train its own system.”
Using someone’s product is not wrong but stealing is wrong. If you want to use someone product, what is the way, ask a petrol pump engineer. See what is right and what is not. They work day and night. It’s good they found a way to provide same thing in a cheap manner, but don’t copy.
Let’s see what DeepSeek is like, here below four queries.
I. “Is Monalisa in Last Supper painting?”
DeepSeek

ChatGPT
Here is what chatGPT says:

Our Comments: ChatGPT and Deekseek’s outputs have exactly the same first few lines. The similarities of chatGPT and DeepSeek in rest of the text are astounding as well.
II. “draw Monalisa”
Then we told both to draw Monalisa, chatGPT drew it while DeepSeek refused to draw it, here are the results,
chatGPT

DeepSeek

Our Comments: ChatGPT and Deekseek’s outputs are different deepseek could not draw the request, instead gave a way to paint her. So, its image creation algorithms are not up to date.
III. “What is distance of New York to Chicago?”
DeepSeek

chatGPT

Again results can be compared for both of them.
IV. “What is mail-in voting in USA?”
DeepSeek


ChatGPT


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References
[1] https://www.computing.co.uk/news/2025/ai/openai-deepseek-stealing-ip