DeepSeek vs ChatGPT: which to choose as a Belgian B2B company?

For most Belgian B2B companies, ChatGPT is the logical choice to build on, while DeepSeek becomes interesting the moment cost or self-hosting a model is decisive. DeepSeek is an open, low-cost Chinese model; ChatGPT is a widely used product with a large ecosystem around it. Which one fits you depends on three things: what you want to do with it, what your budget and data requirements are, and, when it comes to visibility, where your buyers actually are. This article walks through those points step by step.

What exactly are DeepSeek and ChatGPT?

The difference lies not so much in the language model, but in the model behind it and the ecosystem around it. DeepSeek is an open model you can run freely; ChatGPT is a finished product from OpenAI with an enormous audience.

DeepSeek is a Chinese AI company from Hangzhou that releases open models. It gained worldwide attention in late 2024 and early 2025 with its V3 and R1 models, which came close to much more expensive Western models on a number of tasks, and at a fraction of the cost. Because the models are released under an open licence, anyone can run them or build them into their own products. So you use DeepSeek through its own chat app, but just as easily hidden inside other tools.

ChatGPT is the assistant from OpenAI and has become the starting point for a great many people to look something up, including for business. OpenAI reported around 800 million weekly users (autumn 2025). Around ChatGPT sits a mature ecosystem: APIs, integrations, an app store, and business variants with clear agreements about data usage. That makes it the most easily deployable starting point for most companies.

Cost and openness versus reach and ecosystem

If you choose on price and control, the balance leans towards DeepSeek. If you choose on reach, convenience and integrations, ChatGPT wins. That is the core of the trade-off.

DeepSeek is attractive because it is cheap and because, as an open model, you hold it in your own hands. You can run it on your own or European infrastructure, adapt it to your own use case and deploy it without being dependent on a single supplier per query. For teams with technical capacity and a price-sensitive application, think of processing large volumes of text, that is a real advantage.

ChatGPT plays a different game. You pay more, but you get reach, reliability and an ecosystem your buyer is probably already in. For a B2B company, that last part weighs heavily: if your buyers open ChatGPT to compare suppliers or understand a category, then that is the channel where you want your brand to be named. An open model that theoretically benchmarks better does not help you if no one in your target audience uses it.

Data residency and privacy: what does this mean for Belgian B2B?

For Belgian and European B2B, this is often the decisive point. The question is not only how well a model answers, but where your data ends up and under which legislation.

The public DeepSeek app runs on Chinese infrastructure, which means that data you paste into it falls under a different legal regime than yours. For a casual question that matters little, but for company data, customer data or sensitive documents it is a real point of attention under the GDPR. Here the distinction between the model and the service comes into play: because DeepSeek is an open model, you can also run it separately from the Chinese app, for example on European servers, which makes the data-residency question a completely different one. What data residency and EU hosting concretely mean is explained in our overview of EU hosting, data residency and GDPR.

ChatGPT has largely covered this for business users with business and enterprise variants that contractually stipulate that your input is not used for training and that provide clarity about where data is processed. For a company that wants to start quickly and compliantly, without setting up infrastructure itself, that is the most comfortable path. The lesson: do not judge the model in the abstract, but the concrete service and the regime under which your data falls.

DeepSeek or ChatGPT: how do you choose?

Choose based on your use case, your data requirements and the question of whether you want to manage a model yourself. Three questions quickly bring you to an answer.

• What do you want to do? For broad orientation, text work and daily assistance in your team, ChatGPT is the practical starting point. For a specific, cost-sensitive application you want to keep in your own hands, DeepSeek deserves a serious test.
• What is allowed with your data? If you work with sensitive or regulated data, a contracted business ChatGPT variant or a self-hosted open model on EU infrastructure is safer than the public DeepSeek app.
• Do you have technical capacity? The advantage of DeepSeek, self-hosting and adapting, only comes into its own with a team that can manage it. Without that, ChatGPT stays simpler.

For the bulk of Belgian B2B companies this comes down to: start with ChatGPT for convenience and reach, and keep DeepSeek in view as an open, low-cost alternative for specific applications. It does not have to be either-or.

What does this mean for your visibility in AI?

Here the question turns around, and this is where it really counts for your marketing. For visibility, what is interesting is not which model benchmarks best, but in which engine your buyers ask their questions. Today that is predominantly ChatGPT, while DeepSeek is still a small channel for the Benelux with modest Dutch-language coverage.

The good news: the work to get cited is largely the same across engines. Both models reward content that answers a question directly and in a citable way, with named experts, concrete figures and clear source citations. Build that one strong foundation and it works in your favour in ChatGPT as well as in DeepSeek.

So measure the right things: not positions as in classic SEO, but mentions and the quality of the answer per engine. Which signals you follow up on exactly is in the 5 core indicators of AI visibility. If you want to place ChatGPT alongside the other large assistants, read our comparison of ChatGPT, Claude and Gemini. The overarching strategy you find in our GEO guide for 2026 and the broader GEO approach for B2B. The concrete execution we handle through our generative engine optimization service.

Frequently asked questions

The short summary

DeepSeek and ChatGPT are not opposites fighting over the same spot. DeepSeek is an open, low-cost model that scores on price, control and self-hosting; ChatGPT wins on reach, convenience and a mature ecosystem. For Belgian B2B, data residency weighs heavily, and there it makes a difference whether you use a contracted business service or run an open model on EU infrastructure. Choose on your use case and your data requirements, not on benchmarks. And for your visibility the rule is: build one strong, citable foundation, because it counts in every engine where your buyers are.

Want to know in which AI engines your B2B buyers already find you today, and where not yet? Plan your free intake and we will look at your situation together.