US stocks were mixed on Thursday, eyeing fresh records as OpenAI (OPAI.PVT) buzz buoyed techs and blotted out the prospect of a US government shutdown with no end in sight. The tech-heavy Nasdaq Composite (^IXIC) led the way higher, rising 0.6%. The S&P 500 (^GSPC) was little changed. The Dow Jones Industrial Average (^DJI), which includes fewer tech stocks, wavered along the flat line. The S&P 500 scored a fresh all-time high on Wednesday, closing above 6,700 for the first time, as investors focused on ...