`o3` / `o4-mini` Restore Markdown Formatting

Hmm. Thanks for the help, but let’s see if there’s an official response, since I’m quoting the official OpenAI doc for re-enabling markdown for o1.

The [official doc](https://platform.openai.com/docs/guides/reasoning-best-practices#how-to-
prompt-reasoning-models-effectively) says:

  • Markdown formatting: Starting with o1-2024-12-17, reasoning models in the API will avoid generating responses with markdown formatting. To signal to the model when you do want markdown formatting in the response, include the string Formatting re-enabled on the first line of your developer message.

Any official guidance will be appreciated.