自 2025 年 8 月 6 日起，GPT-4o 模型已在 Copilot Chat 中正式弃用，不再可用。GPT-4.1 现已成为推荐模型，并为所有用户提供更佳的性能和功能。
https://github.blog/changelog/2025-08-06-deprecation-of-gpt-4o-in-copilot-chat/
https://github.blog/changelog/2025-08-06-deprecation-of-gpt-4o-in-copilot-chat/
The GitHub Blog
Deprecation of GPT-4o in Copilot Chat - GitHub Changelog
As of August 6, 2025, the GPT-4o model has been officially deprecated in Copilot Chat and is no longer available. GPT-4.1 is now the recommended model and offers improved performance…
