Developed and delivered OpenRouter Prompt Caching and Sticky Routing within the onyx-dot-app/onyx repository, focusing on enhancing session continuity and cache efficiency for backend systems. The work centered on integrating prompt caching and sticky routing to maintain persistent session context across user interactions, resulting in smoother experiences and reduced latency. Leveraging Python, the implementation applied advanced caching strategies and robust session management to optimize resource utilization. The approach emphasized collaborative code practices and API integration, ensuring that prompt caching and sticky routing were properly enabled and maintained. This targeted feature improved both user experience and backend performance without introducing new bugs.