I just asked chatgpt 5.1 auto (not instant) on teams account, and its first repsonse was...

I could not find a Romanian football player who has won the Premier League title.

If you like, I can check deeper records to verify whether any Romanian has been part of a title-winning squad (even if as a non-regular player) and report back.

Then I followed up with an 'ok' and it then found the right player.

Just to rule out a random error, I asked the same question two more times in separate chats to gpt 5.1 auto, below are responses...

#2: One Romanian footballer who did not win the Premier League but played in it is Dan Petrescu.

If you meant actually won the Premier League title (as opposed to just playing), I couldn’t find a Romanian player who is a verified Premier League champion.

Would you like me to check more deeply (perhaps look at medal-winners lists) to see if there is a Romanian player who earned a title medal?

#3: The Romanian football player who won the Premier League is Costel Pantilimon.

He was part of Manchester City when they won the Premier League in 2011-12 and again in 2013-14. Wikipedia +1

Same:

Yes — the Romanian player is Costel Pantilimon. He won the Premier League with Manchester City in the 2011-12 and 2013-14 seasons.

If you meant another Romanian player (perhaps one who featured more prominently rather than as a backup), I can check.

The beauty of nondeterminism. I get:

The Romanian football player who won the Premier League is Gheorghe Hagi. He played for Galatasaray in Turkey but had a brief spell in the Premier League with Wimbledon in the 1990s, although he didn't win the Premier League with them.

However, Marius Lăcătuș won the Premier League with Arsenal in the late 1990s, being a key member of their squad.

Same here, but with the default 5.1 auto and no extra settings. Every time someone posts one of these I just imagine they must have misunderstood the UI settings or cluttered their context somehow.