diff --git a/astrbot/core/provider/sources/openai_source.py b/astrbot/core/provider/sources/openai_source.py
index 15fd6b72f4..c90060224b 100644
--- a/astrbot/core/provider/sources/openai_source.py
+++ b/astrbot/core/provider/sources/openai_source.py
@@ -848,17 +848,19 @@ async def _parse_openai_completion(
         # parse the text completion
         if choice.message.content is not None:
             completion_text = self._normalize_content(choice.message.content)
-            # specially, some providers may set <think> tags around reasoning content in the completion text,
+            # Some compatible providers wrap reasoning in <think> or <thinking> tags.
             # we use regex to remove them, and store then in reasoning_content field
-            reasoning_pattern = re.compile(r"<think>(.*?)</think>", re.DOTALL)
+            reasoning_pattern = re.compile(r"<(think|thinking)>(.*?)</\1>", re.DOTALL)
             matches = reasoning_pattern.findall(completion_text)
             if matches:
                 llm_response.reasoning_content = "\n".join(
-                    [match.strip() for match in matches],
+                    [match[1].strip() for match in matches],
                 )
                 completion_text = reasoning_pattern.sub("", completion_text).strip()
-            # Also clean up orphan </think> tags that may leak from some models
-            completion_text = re.sub(r"</think>\s*$", "", completion_text).strip()
+            # Also clean up trailing reasoning closing tags from some models.
+            completion_text = re.sub(
+                r"</(?:think|thinking)>\s*$", "", completion_text
+            ).strip()
             llm_response.result_chain = MessageChain().message(completion_text)
         elif refusal := getattr(choice.message, "refusal", None):
             refusal_text = self._normalize_content(refusal)
diff --git a/tests/test_openai_thinking_tags.py b/tests/test_openai_thinking_tags.py
new file mode 100644
index 0000000000..ae88f770e5
--- /dev/null
+++ b/tests/test_openai_thinking_tags.py
@@ -0,0 +1,69 @@
+import pytest
+from openai.types.chat.chat_completion import ChatCompletion
+
+from astrbot.core.provider.sources.openai_source import ProviderOpenAIOfficial
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize(
+    ("content", "reasoning_field", "answer", "reasoning"),
+    [
+        ("<think>First\nsecond</think>Answer", None, "Answer", "First\nsecond"),
+        ("<thinking>First\nsecond</thinking>Answer", None, "Answer", "First\nsecond"),
+        ("<thinking></thinking>Answer", None, "Answer", ""),
+        ("<thinking>Only reasoning</thinking>", None, "", "Only reasoning"),
+        (
+            "<think>One</think><thinking>Two</thinking>Answer",
+            None,
+            "Answer",
+            "One\nTwo",
+        ),
+        ("Answer</think>", None, "Answer", None),
+        ("Answer</thinking>  ", None, "Answer", None),
+        (
+            "Ordinary thinking and reasoning",
+            None,
+            "Ordinary thinking and reasoning",
+            None,
+        ),
+        ("<thinker>Example</thinker>", None, "<thinker>Example</thinker>", None),
+        ("<thinking>Inline</thinking>Answer", "Structured", "Answer", "Structured"),
+        ("<thinking>Inline</thinking>Answer", "", "Answer", ""),
+        ("<thinking>Unfinished", None, "<thinking>Unfinished", None),
+        (
+            "<think>Example</thinking>Answer",
+            None,
+            "<think>Example</thinking>Answer",
+            None,
+        ),
+    ],
+)
+async def test_openai_reasoning_tag_compatibility(
+    content, reasoning_field, answer, reasoning
+):
+    provider = ProviderOpenAIOfficial.__new__(ProviderOpenAIOfficial)
+    provider.reasoning_key = "reasoning_content"
+    message = {"role": "assistant", "content": content}
+    if reasoning_field is not None:
+        message["reasoning_content"] = reasoning_field
+    completion = ChatCompletion.model_validate(
+        {
+            "id": "reasoning-tags",
+            "object": "chat.completion",
+            "created": 0,
+            "model": "test-model",
+            "choices": [
+                {
+                    "index": 0,
+                    "finish_reason": "stop",
+                    "message": message,
+                }
+            ],
+        }
+    )
+    response = await provider._parse_openai_completion(completion, None)
+    assert response.completion_text == answer
+    if reasoning is not None:
+        assert response.reasoning_content == reasoning
+    else:
+        assert not response.reasoning_content