I’ve recently changed the model parameter from ‘gpt-4.1-mini’ to ‘gpt-5-nano’ and since then, I’ve started noticing few issues: The response time is too long even though OpenAI claims is to be the fastest in gpt-5 family. The bigger issue is how the response is returned by the model. Previous mode…

Issues rendering markdown format when model was set to 'gpt-5-nano'

aprendendo.next November 21, 2025, 2:07pm 2

Hi! Gpt-5 doesn’t support markdown by default.

You can find some tips on this post on how to enable it.

Topic		Replies	Views
The stupid decision to remove markdowns from the GPT-5 API's JSON response Feedback json , output-markdown , gpt-5	2	765	August 11, 2025
`o3` / `o4-mini` Restore Markdown Formatting API o3	5	1474	May 23, 2025
How to control a model's answers in Markdown format Bugs api	2	544	May 30, 2025
Is it possible to enforce gpt-5 to output markdown for code output/latex output without prompting it to do so API gpt-5	1	169	September 4, 2025
GPT-4o Markdown Output Issue Bugs output-markdown	4	817	October 24, 2024