OpenAI’s recent DevDay event saw the launch of several new tools aimed at enhancing AI app development, including the Realtime API for building low-latency, conversational experiences. This API allows AI models to engage in phone conversations, with applications in areas such as customer service, education, and accessibility. The event also introduced vision fine-tuning, allowing developers to customize visual understanding capabilities within GPT-4, leading to improvements in autonomous vehicle lane detection, medical imaging, visual search, and mapping services. Finally, prompt caching was unveiled, a feature designed to reduce development costs by storing and reusing prompts, making AI development more accessible and affordable.