ChatGPT is retiring o3 on August 26, 2026. If you still use it in regular chats or Custom GPTs, this is your reminder to check your setup before the model disappears from the picker.

I'll talk about the o3 retirement notice, OpenAI’s suggested replacement, and the places where o3 may be hiding in your ChatGPT workflow.

Key details and action steps:
- August 26 Cutoff: o3 leaves the standard ChatGPT model selector in chat and custom GPT options in less than a week.
- Early December API Window: Automations (such as Zapier workflows) using o3 over the API have a few extra months, but migration should start now.
- Custom GPT Fix: Open your side menu, select your custom GPT, click Configure, and manually change the underlying model before it defaults automatically.
- Replacement Strategy: OpenAI recommends GPT-5.6 Sol with Pro effort, but testing lower effort levels can save both time and tokens.
- Work Interface Exception: ChatGPT Work model options are unaffected because o3 was never an available model in that environment.


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Timestamps
00:00 - OpenAI o3 Model Deprecation Date
00:40 - OpenAI o3 Recommended Replacement: GPT-5.6 Sol Pro
01:40 - Is o3 Included in ChatGPT Work?
01:55 - o3 API Deprecation Timeline
02:24 - How to Update Custom GPTs Before August 26
03:13 - Recap: OpenAI 03 Retiring in ChatGPT Chat


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