Retiring GPT-4o, GPT-4.1, GPT-4.1 mini, and OpenAI o4-mini in ChatGPT

OpenAI says it will retire four models in ChatGPT: GPT-4o, GPT-4.1, GPT-4.1 mini, and OpenAI o4-mini. Only the title is disclosed so far; the post does not disclose timing, replacement models, API impact, or migration conditions. The key issue is compatibility breakpoints, not the retirement headline itself.

Why it matters: The official OpenAI post confirms four named models will be retired in ChatGPT, which creates direct workflow and reproducibility concerns for users anchored to specific model choices. HKR-H and HKR-R pass, but HKR-K fails because timing, replacement models, API scope, and migrat