GPT-4o removed from ChatGPT without notice at GPT-5 launch, then restored for paid users

At the GPT-5 launch OpenAI retired GPT-4o, GPT-4.1, GPT-4.5, o3 and other models in consumer ChatGPT with no deprecation period. After user backlash it brought GPT-4o back to the picker for paid users. The Hacker News discussion drew 428 points and 412 comments.

Who is affected:

ChatGPT consumers who relied on GPT-4o.

What to do:

No action needed (historical event).