OpenAI didn’t release any new models at its Dev Day event but new API features will excite developers who want to use their models to build powerful apps. OpenAI has had a tough few weeks with its CTO, Mira Murati, and other head researchers joining the ever-growing list of former employees. The company is under increasing pressure from other flagship models, including open-source models which offer developers cheaper and highly capable options. The new features OpenAI unveiled were the Realtime API (in beta), vision fine-tuning, and efficiency-boosting tools like prompt caching and model distillation. Realtime API The Realtime API is…