The author of the post claims that the quality of GPT-4's responses has significantly deteriorated lately, despite being faster than before. They notice that it generates more buggy code and provides less in-depth analysis. The author wonders if using a different version of GPT-4, such as Poe's, would yield better results. The post also mentions that another GPT-4 powered search engine, phind.com, has switched to using GPT-3.5 and its own model more frequently.