DeepSeek vs ChatGPT: how the two actually compare

DeepSeek and ChatGPT are both strong general-purpose AI models with different strengths. DeepSeek’s reasoning models are known for showing detailed step-by-step working on maths and logic problems, often at a lower cost to run, while ChatGPT, built on OpenAI’s GPT models, tends to feel more polished for everyday writing and has a longer track record with extra features like voice conversations. Neither is better at everything, so the right choice depends on the task in front of you, and you can also use both of them from one app like AiFevo rather than choosing just one.

Who makes each one

DeepSeek is a Chinese AI lab that released its models openly, which made them unusually easy for other companies and apps to adopt. ChatGPT is OpenAI’s own product, built around its GPT family of models, and remains one of the most widely used AI apps in the world. Both are updated regularly, so any comparison is a snapshot rather than a permanent ranking.

Where DeepSeek tends to stand out

DeepSeek’s reasoning-focused models are frequently praised for showing their working on maths, logic and multi-step problems, which makes it easier to spot where an answer went wrong. Because the models are released openly, many apps, including AiFevo, can offer DeepSeek alongside other models at a lower cost than fully closed alternatives, which is part of why you’ll find DeepSeek even on AiFevo’s Free plan.

Where ChatGPT tends to stand out

OpenAI has had years to refine ChatGPT’s everyday writing, the feel of its conversations and its range of built-in features, including voice chat, custom instructions and a long history of plugin-style integrations. If you want a single, well-rounded assistant with a mature set of extra features and you don’t mind sticking to one maker, ChatGPT is a reasonable default, and for many people it remains the first AI app they think of.

Side by side

Try the same question on both

The most honest way to compare them is with your own questions, not someone else’s benchmark. In AiFevo, you can ask DeepSeek something, then switch the model from the menu under the message box and ask GPT the same thing in the same conversation, without retyping anything. Comparing step-by-step reasoning on a tricky maths problem is a good first test:

“Solve this step by step, showing your working at each stage, then check your answer a different way.”

Ask both models and see which explanation you find clearer. For general writing, try something more open-ended:

“Write a short, warm thank-you note to a mentor who helped me get my first job. Keep it under 100 words.”

Read both answers aloud. The one that sounds more like something you’d actually send is the better model for that job, which might not be the same model that won the maths test.

Where each one falls short

DeepSeek’s answers can occasionally feel more terse or less naturally phrased in casual writing than ChatGPT’s, and being a newer, more specialised entrant, it has fewer built-in extras like voice conversations. ChatGPT, for its part, is not always the cheapest option to run at scale, and some people find its reasoning for maths and logic less transparent unless you explicitly ask it to show its steps. Neither weakness rules a model out; they just tell you which one to reach for on a given day.

Use both from one place

Picking a single AI app often means picking a single model’s strengths and living with its weaknesses. AiFevo puts DeepSeek, GPT models and several other makers’ models in one chat, so instead of deciding once and sticking with it, you can switch per message. If you want a fuller map of which model suits which kind of work, the best AI model for each task covers it, and if you’re still weighing up a ChatGPT alternative more broadly, that guide compares the full picture.

A note on open models and cost

DeepSeek’s openly released models are part of why it’s been adopted so widely by other apps, including AiFevo, at relatively low cost compared with fully closed alternatives. That doesn’t make DeepSeek inherently “better,” but it does mean apps that want to offer strong reasoning capability on their free or lower tiers often reach for it first, which is one reason you’ll find DeepSeek available even without a paid plan in AiFevo.

Frequently asked questions

Is DeepSeek better than ChatGPT at maths?

DeepSeek’s reasoning-focused models are widely regarded as strong at maths and logic, often showing clear step-by-step working. ChatGPT can do this too, especially when you ask it to show its steps, but DeepSeek’s models were specifically built with visible reasoning as a focus. Try the same problem on both to see which explanation suits you.

Is DeepSeek free to use?

DeepSeek’s own app has a free tier, and because its models are released openly, apps like AiFevo can offer DeepSeek at low or no extra cost too. AiFevo includes DeepSeek on its Free plan alongside Super Fevo and a handful of other everyday models.

Can I use DeepSeek and ChatGPT in the same conversation?

Not in either company’s own app, since each is built around its own models. In AiFevo, though, you can ask DeepSeek a question and then switch to a GPT model from the menu in the same chat, which keeps the conversation and lets you compare the two answers directly.

Which one is better for coding?

Both are capable at code, and the better choice often depends on the language and the kind of help you need: DeepSeek’s step-by-step style suits debugging and explaining why code fails, while ChatGPT is a strong all-rounder for writing new code from a description. Our guide to the best AI for coding goes deeper on this.

Is my data safe with either one?

Both companies have their own privacy policies, and where your data is processed and how it’s used differs between them, so it’s worth reading each provider’s policy if that matters to you. When you use either model through AiFevo, your messages are sent to that model’s provider to generate the answer, the same as using any AI app.

See which one fits your work

The fastest way to find out is to ask your own real questions to both. Start free on AiFevo, try a DeepSeek model and a GPT model on the same prompt, and keep whichever one answers the way you need. See pricing for which plan includes which models, read Grok vs ChatGPT if you’re weighing up a third option, or ChatGPT alternative for the fuller picture on moving away from a single app.