One Head, Many Models: Cross-Attention Routing for Cost-Aware LLM Selection. - Roshini Pulishetty; Mani Kishan Ghantasala; Keerthy Kaushik Dasoju; Niti Mangwani; Vishal Garimella; Aditya Mate; Somya Chatterjee; Yue Kang; Ehi Nosakhare; Sadid Hasan; Soundar Srinivasan (CoRR, 2025)