If you need to change the display name shown in ChatGPT, you can update it through your OpenAI account settings.
Steps
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Go to the OpenAI User Settings page:
https://platform.openai.com/account/user-settings
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Sign in to your OpenAI account if prompted.
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Find the Name field.
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Update your name and save the changes.
Important Notes
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Changes are made in your OpenAI Platform account settings.
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After updating, it may take up to 15 minutes for the new display name to appear in ChatGPT.