
It's been 4 more months and I just confirmed this is still very true. I asked Copilot to rewrite an OpenAI Assistants API function to use their Chat Completions API instead, and it got the name of the OpenAI library function name wrong, and request body format wrong
"I’ve been using GitHub Copilot off and on since it was released, and have a mostly favorable view of its capabilities...But you know what it can’t do? Write AI apps."