This is annoying because GPT-5 is the state-of-the-art model of OpenAI, and I encounter this problem in every single conversation.

这让人困扰，因为 GPT-5 是 OpenAI 的最先进模型，而我在每一次对话中都会遇到这个问题。

+1. This issue seems to be caused by the "stream" mode.

While it can be temporarily fixed by manually turning off the "stream" option, .

Even though I’ve disabled "stream" in the global default configuration and the toggle appears off in the conversation settings, every new chat still triggers the same "unsupported_value" error.

To make it work, I have to manually turn the "stream" option on and then off again each time.

Clearly, there’s an inconsistency in how the configuration is applied — the button doesn’t actually save the setting across sessions.

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+1. 这个问题似乎与 “stream” 模式有关。

虽然可以通过手动关闭 “stream” 临时解决，但。

即使我已经在全局配置中默认关闭 “stream”，并且在对话设置中也显示为关闭，每次新建对话仍然会出现 "unsupported_value" 错误。

必须手动先打开再关闭一次 “stream” 选项，才能生效。

显然，配置在应用中的一致性存在问题——该按钮没有真正保存设置。