AIOSEO's OpenAI integration now uses ChatGPT, which is 10x more affordable and provides better results for generating SEO titles and meta descriptions.
Additional, human-curated information:
Starting in March of 2023, AIOSEO added OpenAI integration for SEO titles, and meta descriptions. A week after release, the underlying model was replaced by ChatGPT (also an OpenAI product) to reduce costs and provide high-quality results.