An Italian senator has surprised his colleagues by reading out in parliament a speech drafted by a chatbot, saying afterwards that he pulled the stunt to stir “a serious debate” on risks and opportunities posed by artificial intelligence.

“How many of us today are able to distinguish between a text produced by human intelligence and a stream of thoughts ... produced by an artificial intelligence algorithm?” senator Marco Lombardo asked colleagues.

His speech, on the subject of various bilateral deals with Switzerland, was produced by Microsoft Corp-backed OpenAI’s GPT-4 chatbot, the senator told Reuters on Thursday.

He said his staff “took a couple of hours” to feed the necessary information into the software, which then produced the speech.

The leader of Lombardo’s Azione party, Carlo Calenda, said on Twitter that what the senator said in the chamber was “impeccable”, but added: “It is not yet clear to me whether we are looking at progress or at a step back.”