The original was mostly trained on Python[1], but JS seems a close second. So I assume python has the highest quality. If you don't specify a language, it seems

The original was mostly trained on Python[1], but JS seems a close second. So I assume python has the highest quality. If you don't specify a language, it seems pick either of these. [1] https://openai.com/blog/openai-codex https://openai.com/blog/openai-codex