I've been using phind, poe, etc. which use GPT-4 API and the difference between the original GPT-4 results and OpenAI's nerfed web interface is HUGE! I don't know what OpenAI did to their website but they basically made it dumb enough that I stopped my ChatGPT Pro subscription and started using third party websites.
I would gladly pay the subscription fee if OpenAI wouldn't neuter GPT-4 on their website. I'd even pay more to get access to a more powerful and less restricted GPT-4, but I know that'll never happen due to legal reasons.
Edit: I think phind.com switched to ChatGPT-4 Pro. They used to use GPT-4 API but after the switch, there's a noticeable degradation in quality of responses. :(