Indian benchmark indices, Sensex and Nifty 50, are expected to open flat on October 25, following GIFT Nifty's performance around 24,460.5. On October 24, both indices ended muted, with Sensex down 16.82 points at 80,065.16 and Nifty down 36.10 points at 24,399.40, as FMCG and IT stocks weighed down Nifty, while financials provided some support.