It's using GPT-3 as the underlying technology, which has been open to everyone for a few month now [1]. More specifically, it's using the codex model for code g

It's using GPT-3 as the underlying technology, which has been open to everyone for a few month now [1]. More specifically, it's using the codex model for code generation (which is still on a waitlist to access I think), but if you're more interested in the text/Q&A style generation it won't matter much. [1] https://openai.com/blog/api-no-waitlist/ https://openai.com/blog/api-no-waitlist/