Google is considering charging for new “premium” features run by artificial intelligence, the Financial Times reported, marking the first time it would put any of its core product behind a paywall.

The tech giant is mulling options such as adding certain AI search features to its premium subscription services, the FT reported, citing three unnamed people familiar with the plans. Engineers are developing the technology to roll out the service but executives haven’t decided whether or when to launch it, according to the report. Google’s ubiquitous search engine would continue to be free and ads would appear alongside search results even to subscribers, the FT said.