Audit Your Prompts for the GPT-4.5 and o3 Retirement Deadlines
Proactively transition tasks to GPT-5 models before the 2026 deadlines.
Audit your saved ChatGPT prompts for dependencies on GPT-4.5 or OpenAI o3. Transition these tasks to GPT-5.4 Thinking or GPT-5.5 Instant before the summer 2026 retirement dates.
The Scenario
You have a specific prompt optimized for GPT-4.5 or o3 and need to ensure it continues to work as those models are phased out in mid-2026.
Before & after
Users often get 'stuck' using older models they are comfortable with, only to find their workflow broken when the model is abruptly retired, potentially wasting hours troubleshooting.
Switch your model setting to GPT-5.4/5.5 in seconds. If you have legacy dependencies, use the API to keep access to o3/4.5 models post-retirement.
The Prompt
Analyze my current [WORKFLOW/PROMPT] and advise on which GPT-5 model (Instant vs Thinking) is best suited for it once GPT-4.5 is retired. [PASTE_PROMPT_HERE]
GPT-4.5 will be retired from ChatGPT on June 27, 2026, and OpenAI o3 on August 26, 2026. While they remain in the API, ChatGPT users must transition to GPT-5 series models.
Source
Model Release Notes | OpenAI Help Center"OpenAI o3 and GPT-4.5 will be retired from ChatGPT on August 26, 2026, and June 27, 2026, respectively."