Which model did you try it on? I just tested it with the default gpt4 and it gave the system prompt 5 out of 5 tries. It also works on dall-e, advanced data analysis and plugins (each worked 2 out of 2 tries). It seems to have problem with the web browsing version though. If you're trying with the free version of chatgpt it won't work because that is using GPT-3.5.