From a6c60e3cffb1ff1bdde710423d53d2aebccf7a84 Mon Sep 17 00:00:00 2001
From: Yufeng He <40085740+universeplayer@users.noreply.github.com>
Date: Wed, 18 Mar 2026 13:54:27 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BF=AE=E5=A4=8D=E5=88=87=E6=8D=A2=E6=A8=A1?=
 =?UTF-8?q?=E5=9E=8B=E5=90=8E=20empty=20content=20=E5=AF=BC=E8=87=B4=20Gro?=
 =?UTF-8?q?k=20=E7=AD=89=20provider=20=E8=BF=94=E5=9B=9E=20400?=
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_finally_convert_payload 提取 think 部分后，如果 assistant 消息的
所有 content 都是 think 类型，new_content 会变成空列表 []。
Grok 等 provider 不接受空 content list，直接报 400。

改为 new_content or None，空列表时回退到 None（OpenAI 兼容 API
普遍接受 null content 的 assistant 消息）。

Fixes #6447
---
 astrbot/core/provider/sources/openai_source.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/astrbot/core/provider/sources/openai_source.py b/astrbot/core/provider/sources/openai_source.py
index 2fae94e1a7..b3355668ee 100644
--- a/astrbot/core/provider/sources/openai_source.py
+++ b/astrbot/core/provider/sources/openai_source.py
@@ -604,8 +604,9 @@ def _finally_convert_payload(self, payloads: dict) -> None:
                         reasoning_content += str(part.get("think"))
                     else:
                         new_content.append(part)
-                message["content"] = new_content
-                # reasoning key is "reasoning_content"
+                # Some providers (Grok, etc.) reject empty content lists.
+                # When all parts were think blocks, fall back to None.
+                message["content"] = new_content or None
                 if reasoning_content:
                     message["reasoning_content"] = reasoning_content