The last OpenAI model, gpt-4o-mini, released on July 18, 2024, is available to be used at translate.wordpress.org. To update it, you can do it at https://translate.wordpress.org/settings/
The available models at translate.wordpress.org are gpt-3.5-turbo, gpt-4, gpt-4-turbo, gpt-4o, gpt-4o-mini.