I use opus 5.5 and chatgpt to create PowerPoint, opus really follow the instruction and their PowerPoint generator really well, while chatgpt struggling to even create basic shapes.
I use ChatGPT Work mode all the time to create presentation files. I use Max thinking mode for it. You need to tweak your prompt to get a good result. It took me a week to tweak it, but now it works.
Mind sharing your examples, thanks. Either in prompt or generated ppt in image
See GitHub gist 9eb4e5844bc2bc7490f3b8c0e3f22081. I use the first of the two skills there. Remember to use Max reasoning effort for best results.