Protect Critical o3 and GPT-4.5 Workflows via API Migration
Preserve legacy workflows by moving them to the API.
If you rely on OpenAI o3 or GPT-4.5, move your workflows to the API before their respective retirement dates in late 2026.
The Scenario
You have a specific prompt or 'GPT' that only works perfectly with GPT-4.5's unique style or o3's specific reasoning logic.
Before & after
If your custom workflow relies on o3's reasoning, you would lose that functionality when the model is retired from the ChatGPT interface, costing hours of rework.
Switch to the API to keep your GPT-4.5 or o3 workflows running indefinitely, which takes about 10–15 minutes to set up with an API key.
The Prompt
I am currently using o3 for [SPECIFIC_TASK]. Please explain how I can access this same model via the OpenAI API after its retirement from ChatGPT.
OpenAI is retiring o3 (August 2026) and GPT-4.5 (June 2026) from the ChatGPT UI but keeping them in the API. If your business depends on these specific models, move those tasks to an API-based tool.
Source
Model Release Notes | OpenAI Help Center"These changes apply to ChatGPT only; there are no changes to the API."