EU Declares ChatGPT a Search Engine: What It Means for AI Visibility

The European Commission designated ChatGPT a Very Large Online Search Engine (VLOSE) under the Digital Services Act on 31 August 2026, the first time Brussels has classified a generative AI service this way. The ruling forces OpenAI to publish how ChatGPT ranks and recommends content, submit to independent risk audits, and give regulators data access, obligations that will directly shape how brands can measure and influence their visibility inside AI answers.

What changed?

The European Commission has designated ChatGPT as a Very Large Online Search Engine under the Digital Services Act, alongside similar heavyweight designations for Reddit and Roblox as Very Large Online Platforms. The European Commission confirmed that these services declared they reach at least 45 million average monthly users in the EU, meeting the threshold for designation.

The numbers behind the decision are striking. ChatGPT reported 159 million monthly active users, Reddit 57.2 million, and Roblox 48 million in the EU, all comfortably clearing the 45 million-user bar that triggers the DSA's toughest rules. According to Gizmodo, ChatGPT likely crossed that threshold a while ago given its more than 1 billion weekly users globally, but the Commission reportedly took time to settle the classification question.

The legal reasoning matters for anyone tracking AI search visibility. As Winbuzzer reports, the EU considers ChatGPT a hybrid service: it answers conversational prompts but can also search the web and return information gathered from online sources, and the Commission says that second function brings it within the DSA's definition of an online search engine. In other words, it's ChatGPT's live web search behaviour, not its chatbot branding, that pulled it into this regulatory tier.

Henna Virkkunen, the Commission's Executive Vice-President for Tech Sovereignty, Security and Democracy, framed the move plainly: "These new designations mean that ChatGPT, Reddit and Roblox will now be subject to a higher level of scrutiny and accountability in the European Union, commensurate with their significant impact on our citizens and society."

Why does this matter for your business?

If you care about how AI systems surface your brand, this designation is significant because it forces transparency obligations that have never applied to a generative AI product before. Under the DSA's VLOSE and VLOP rules, designated services must publish detail on how recommendation and ranking systems work, offer users a non-personalised option, and submit to annual independent audits of systemic risks.

That's a meaningful shift for anyone doing generative engine optimisation or answer engine optimisation work. Up to now, how ChatGPT decides which sources to surface, cite or recommend has been a black box, reverse-engineered through observation and testing. A legal requirement to disclose ranking logic, even in general terms, could give marketers their first officially sanctioned insight into why some brands get cited and others don't.

The compliance clock is already running. OpenAI, along with Reddit and Roblox, now has a fixed window to act: explainx.ai notes that all three have roughly four months, into January 2027, to meet the DSA's heaviest set of obligations. Other reporting puts the practical deadline at the end of December 2026 to comply with obligations covering minor safety, algorithmic transparency, illegal-content mitigation and independent risk audits, according to AI Chat Daily.

There's also a precedent effect worth watching. AI Weekly's analysis argues that the classification rests on ChatGPT's live web-search capability rather than its product category, giving regulators a replicable template for Gemini and, by extension, other AI search tools like Claude and Perplexity. If Brussels applies the same test to competing platforms, the whole AI search landscape could face parallel disclosure requirements within the next year or two, which would be transformative for anyone trying to understand and improve their brand's AI visibility.

The stakes for non-compliance are high enough to guarantee OpenAI takes this seriously. Fines for non-compliance run up to 6% of global annual revenue, and the Commission has already shown it will use that power: the DSA has produced roughly €870 million in fines to date, including €550 million against AliExpress, €200 million against Temu and €120 million against X.

Oversight has also been consolidated in a single authority. Ireland's Coimisiún na Meán now supervises ChatGPT, Reddit, Meta, Google and Apple under the DSA, concentrating an outsized share of EU tech enforcement in a single national authority. That gives one regulator an unusually complete view across the AI search and social ecosystem, which could speed up how quickly transparency findings become public.

What should you do now?

Nothing about your day-to-day AI visibility work changes immediately. OpenAI hasn't published its ranking methodology yet, and the audit and transparency requirements won't bite until closer to the end of 2026. But there are three things worth doing now.

First, treat this as confirmation that regulators now view AI answer engines the same way they view Google Search: as gatekeepers of information with real power over what people see and buy. That should reinforce, not diminish, the priority you put on AI visibility work.

Second, watch for OpenAI's forthcoming risk assessment and any published detail on ranking and recommendation systems. Winbuzzer's reporting notes that OpenAI confirmed its search function operates as a search service under the DSA and that the company was preparing for the additional requirements. Whatever it discloses in the coming months is likely to be the closest thing yet to an official explanation of how ChatGPT decides what to cite.

Third, keep monitoring your own citation and recommendation patterns across ChatGPT, Gemini, Perplexity and Google AI Overviews in the meantime, because regulatory transparency will take time to arrive and won't replace the need for direct measurement. Tools like Sited's free audit at sited.online let you check how your brand currently shows up across these platforms without waiting for Brussels to force the issue.

Frequently asked questions

What is a Very Large Online Search Engine (VLOSE) under the DSA?

It's the EU's strictest regulatory tier for search engines, triggered once a service reaches 45 million average monthly users in the EU. Designated services face algorithmic transparency, independent audits and data access requirements, as confirmed by the European Commission.

Does this mean ChatGPT will have to explain why it cites certain sources?

Not in full detail, but the obligations require designated services to publish how their recommendation and ranking systems work in general terms, according to AI Chat Daily. This is the first time such a requirement has applied to a generative AI product.

When does OpenAI have to comply?

Reports put the deadline at roughly four months from the 31 August 2026 designation, stretching into January 2027, with some sources citing an end-of-December 2026 target for the core obligations, per explainx.ai and AI Chat Daily.

Could Gemini, Perplexity or Claude face the same designation?

Possibly. AI Weekly suggests the Commission's reasoning, based on live web-search capability rather than product category, gives regulators a template they could apply to other AI search tools as their EU user numbers grow.

What happens if OpenAI doesn't comply?

Non-compliance can cost up to 6% of global annual turnover, and the Commission has already levied significant fines against other designated platforms, including €550 million against AliExpress and €200 million against Temu, according to AI Weekly.