[Bug]: Function tools fail with reasoning_effort error for OpenAI gpt-5.6 family models (gpt-5.6-sol/luna/terra) on /chat/completions
![[Bug]: Function tools fail with reasoning_effort error for OpenAI gpt-5.6 family models (gpt-5.6-sol/luna/terra) on /chat/completions](https://www.chat-gpts.plus/wp-content/uploads/2026/08/33221-939ffc10-768x403.jpg)
此报错发生在 LiteLLM 代理上,当对 OpenAI gpt-5.6 系列模型(gpt-5.6-sol/luna/terra)调用 /chat/completions 并携带 function tools 时触发,即使请求体中未显式设置 reasoning_effort 也会报 400 错误。优








