Short answer
If you mean original GPT-4—not GPT-4o—you can’t switch back to it now. ChatGPT retired GPT-4 on April 30, 2025; its API model page now marks GPT-4 as shut down. GPT-4o is a separate model, so its availability does not restore access to GPT-4. (techcrunch.com)
If you use ChatGPT
GPT-4 was retired from ChatGPT on April 30, 2025. You can check the model picker in a new chat, but if GPT-4 is not listed, there is no selection step that will bring it back. The legacy-model setting only exposes legacy models that remain available; retired models no longer appear in the picker. (techcrunch.com)
For Enterprise or Edu, an admin can enable access to legacy models that are still available in the workspace: open Workspace settings, go to Models, and turn on Enable legacy models. This setting does not restore retired GPT-4. (help.openai.com)
If you use the OpenAI API
You also can’t switch an API request to original GPT-4: OpenAI’s model page marks GPT-4 as shut down. Changing your request’s model ID to gpt-4 will not restore access. Choose a currently available model for your project and test the change before deploying. OpenAI says developers can check a model’s optional shutdown_date using GET /v1/models; a listed model’s access and status should be checked for the specific project. (developers.openai.com)
Don’t confuse GPT-4 with GPT-4o
GPT-4o is a different model. OpenAI retired GPT-4o from ChatGPT on February 13, 2026. OpenAI’s API model page labels GPT-4o deprecated, so don’t treat it as a permanent production substitute for GPT-4; check current API status before relying on it. (help.openai.com)
Sources
Legacy Model Access for Enterprise and Edu Users