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Migration Planning for Retiring Legacy Models GPT-4.5 and o3
Audit older workflows before GPT-4.5 and o3 models are sunset.
Proactively test and migrate your legacy GPT-4.5 and o3 prompts to newer models before the 2026 retirement dates.
ChatGPT
The Scenario
You have a specific prompt or API-style workflow that was optimized for GPT-4.5 or o3 and need to ensure it still works on newer models.
Before & after
The old way
Assuming the new model is always better might lead to unexpected formatting changes in automated workflows, taking hours to fix later.
With AI
Use ChatGPT's model settings to explicitly select 'o3' or '4.5' to run final comparisons in 5 minutes before they are gone.
The Prompt
Execute this specific [TASK/PROMPT] using GPT-4.5. I need to compare the output style and logic against the newer GPT-5 series to ensure my workflow remains consistent.
GPT-4.5 and o3 are being retired in June and August 2026, respectively. Users with workflows dependent on these specific models should migrate now.
Source
Model Release Notes | OpenAI Help Center"OpenAI o3 will be retired... August 26, 2026... and GPT-4.5 will be retired... June 27, 2026."