CNBC Daily Open: AI rally defies bond market rout

Traders work on the floor at the New York Stock Exchange (NYSE) in New York City, U.S., Sept. 25, 2026. Brendan McDermid | ReutersHello, this is Leonie Kidd coming to you from London. Welcome to another edition of CNBC's Daily Open.The AI bulls are trampling the bond market canaries in the coal mine. Stock markets are soaring to fresh record highs, even as the bond market sounds the alarm on fiscal constraints. It's a complex mix for investors to navigate, but more clues will come today with the release of Fed minutes which are expected to shed some light on that controversial September hike. Read on for more.What you need to know todayThe S&P 500 has peaked at a fresh record high, closing above 7,800 for the first time ever. The gain comes almost entirely from the tech space, with big chipmakers like Advanced Micro Devices and Marvell Technology leading the rally. The move comes as Treasury yields retreated from their highs but remain at elevated levels. For a deeper look at the S&P's defiant trip higher, you can read more here. Reversal riskDespite the bullish market sentiment around AI, some investors continue to sound warnings.Temasek, Singapore's state-owned investment...