diff --git a/astrbot/core/agent/runners/dify/dify_agent_runner.py b/astrbot/core/agent/runners/dify/dify_agent_runner.py
index 93f8d3570d..41d4cd4ec3 100644
--- a/astrbot/core/agent/runners/dify/dify_agent_runner.py
+++ b/astrbot/core/agent/runners/dify/dify_agent_runner.py
@@ -1,5 +1,6 @@
 import base64
 import os
+import re
 import sys
 import typing as T
 
@@ -192,12 +193,14 @@ async def _execute_dify_request(self):
 
                         # 如果是流式响应，发送增量数据
                         if self.streaming and chunk["answer"]:
-                            yield AgentResponse(
-                                type="streaming_delta",
-                                data=AgentResponseData(
-                                    chain=MessageChain().message(chunk["answer"])
-                                ),
-                            )
+                            delta = self._strip_think_tags(chunk["answer"])
+                            if delta:
+                                yield AgentResponse(
+                                    type="streaming_delta",
+                                    data=AgentResponseData(
+                                        chain=MessageChain().message(delta)
+                                    ),
+                                )
                     elif chunk["event"] == "message_end":
                         logger.debug("Dify message end")
                         break
@@ -279,11 +282,23 @@ async def _execute_dify_request(self):
             data=AgentResponseData(chain=chain),
         )
 
+    @staticmethod
+    def _strip_think_tags(text: str) -> str:
+        """Remove <think>...</think> blocks and orphan </think> tags from text.
+
+        Some models (e.g. DeepSeek-R1) embed chain-of-thought inside <think> tags
+        even when thinking mode is disabled on the Dify side. This mirrors the
+        same cleanup done in openai_source._parse_openai_completion.
+        """
+        text = re.sub(r"<think>.*?</think>", "", text, flags=re.DOTALL)
+        text = re.sub(r"</think>\s*$", "", text)
+        return text.strip()
+
     async def parse_dify_result(self, chunk: dict | str) -> MessageChain:
         """解析 Dify 的响应结果"""
         if isinstance(chunk, str):
-            # Chat
-            return MessageChain(chain=[Comp.Plain(chunk)])
+            # Chat — strip any <think> tags the underlying model may have emitted
+            return MessageChain(chain=[Comp.Plain(self._strip_think_tags(chunk))])
 
         async def parse_file(item: dict):
             match item["type"]:
@@ -303,8 +318,8 @@ async def parse_file(item: dict):
         output = chunk["data"]["outputs"][self.workflow_output_key]
         chains = []
         if isinstance(output, str):
-            # 纯文本输出
-            chains.append(Comp.Plain(output))
+            # 纯文本输出，过滤 <think> 标签
+            chains.append(Comp.Plain(self._strip_think_tags(output)))
         elif isinstance(output, list):
             # 主要适配 Dify 的 HTTP 请求结点的多模态输出
             for item in output:
@@ -313,10 +328,10 @@ async def parse_file(item: dict):
                     not isinstance(item, dict)
                     or item.get("dify_model_identity", "") != "__dify__file__"
                 ):
-                    chains.append(Comp.Plain(str(output)))
+                    chains.append(Comp.Plain(self._strip_think_tags(str(output))))
                     break
         else:
-            chains.append(Comp.Plain(str(output)))
+            chains.append(Comp.Plain(self._strip_think_tags(str(output))))
 
         # scan file
         files = chunk["data"].get("files", [])
diff --git a/tests/test_dify_think_filter.py b/tests/test_dify_think_filter.py
new file mode 100644
index 0000000000..e72c585bb1
--- /dev/null
+++ b/tests/test_dify_think_filter.py
@@ -0,0 +1,48 @@
+"""Unit tests for DifyAgentRunner._strip_think_tags"""
+
+import pytest
+
+from astrbot.core.agent.runners.dify.dify_agent_runner import DifyAgentRunner
+
+strip = DifyAgentRunner._strip_think_tags
+
+
+class TestStripThinkTags:
+    def test_no_tags(self):
+        """Normal text without any think tags should be unchanged."""
+        assert strip("Hello, world!") == "Hello, world!"
+
+    def test_single_think_block(self):
+        """A complete <think>...</think> block should be removed."""
+        result = strip("<think>let me reason</think>Here is my answer.")
+        assert result == "Here is my answer."
+
+    def test_think_block_with_newlines(self):
+        """Multi-line think blocks should be removed."""
+        text = "<think>\nStep 1: think\nStep 2: conclude\n</think>\nFinal answer."
+        assert strip(text) == "Final answer."
+
+    def test_multiple_think_blocks(self):
+        """Multiple consecutive think blocks should all be removed."""
+        text = "<think>block1</think>Middle<think>block2</think>End"
+        assert strip(text) == "MiddleEnd"
+
+    def test_orphan_closing_tag(self):
+        """A trailing </think> without an opening tag should be removed."""
+        assert strip("Some text</think>") == "Some text"
+
+    def test_empty_think_block(self):
+        """An empty <think></think> block should be removed."""
+        assert strip("<think></think>Answer") == "Answer"
+
+    def test_only_think_content(self):
+        """If the entire string is a think block, result should be empty string."""
+        assert strip("<think>all reasoning</think>") == ""
+
+    def test_whitespace_trimmed(self):
+        """Leading/trailing whitespace after stripping should be removed."""
+        assert strip("  <think>x</think>  Answer  ") == "Answer"
+
+    def test_no_modification_when_no_think(self):
+        """Strings without think tags must be returned as-is (stripped)."""
+        assert strip("  plain text  ") == "plain text"