Back in March, OpenAI abruptly pulled the plug on its Sora video app. Two months later, a pair of AI video generation apps is competing for the top of the App Store. Sora was hardly the only AI video generation technology OpenAI discontinued Sora largely due to the cost of running the AI video generation service. The service was resource-hungry and free for users. Instead, OpenAI is focusing on ChatGPT and Codex for enhancing productivity . Codex in particular works best with paid plans. With Sora out of the way, competing AI apps highlighted video generation features. For example, both Gemini and Grok support turning text prompts and images into AI-generated video. But AI video generation is just one feature within these general AI chatbot apps. More recently, two apps dedicated to AI video generation have climbed App Store charts. Two new AI video creation apps for iPhone are climbing App Store charts The first is Kling AI .…