> There are LLMs for image generation,
That part isn’t handled by an LLM
> voice generation,
That part isn’t handled by an LLM
> video generation
That part isn’t handled by an LLM
Yes it can be, and often is. Advanced voice mode in chatGPT and the voice mode in Gemini are LLMs. So is the image gen in both chatGPT and Gemini (Nano Banana).
What is it handled by? I'm honestly curious, there are models specifically labeled as for those tasks.