diff --git a/Easydict/App/Localizable.xcstrings b/Easydict/App/Localizable.xcstrings
index 51005a66d..f626948db 100644
--- a/Easydict/App/Localizable.xcstrings
+++ b/Easydict/App/Localizable.xcstrings
@@ -4672,6 +4672,34 @@
         }
       }
     },
+    "service.configuration.openai.hide_think_tag_content.title" : {
+      "localizations" : {
+        "en" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "Hide <think> Tag Content"
+          }
+        },
+        "sk" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "Skryť obsah <think> Tag"
+          }
+        },
+        "zh-Hans" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "隐藏 <think> 标签内容"
+          }
+        },
+        "zh-Hant" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "隱藏 <think> 標籤內容"
+          }
+        }
+      }
+    },
     "service.configuration.openai.system_prompt.placeholder" : {
       "localizations" : {
         "en" : {
diff --git a/Easydict/Swift/Feature/Configuration/ServiceConfigurationKey.swift b/Easydict/Swift/Feature/Configuration/ServiceConfigurationKey.swift
index e31391c4d..3a155090a 100644
--- a/Easydict/Swift/Feature/Configuration/ServiceConfigurationKey.swift
+++ b/Easydict/Swift/Feature/Configuration/ServiceConfigurationKey.swift
@@ -51,4 +51,5 @@ enum ServiceConfigurationKey: String {
     case enableCustomPrompt
     case systemPrompt
     case userPrompt
+    case thinkTag
 }
diff --git a/Easydict/Swift/Service/OpenAI/StreamService+UpdateResult.swift b/Easydict/Swift/Service/OpenAI/StreamService+UpdateResult.swift
index ea9d0809f..7b7c5ba86 100644
--- a/Easydict/Swift/Service/OpenAI/StreamService+UpdateResult.swift
+++ b/Easydict/Swift/Service/OpenAI/StreamService+UpdateResult.swift
@@ -7,6 +7,7 @@
 //
 
 import Foundation
+import RegexBuilder
 
 extension StreamService {
     /// Throttle update result text, avoid update UI too frequently.
@@ -52,7 +53,11 @@ extension StreamService {
         // If error is not nil, means stream is finished.
         result.isStreamFinished = error != nil
 
-        let finalText = resultText?.trim() ?? ""
+        var finalText = resultText?.trim() ?? ""
+
+        if hideThinkTagContent {
+            finalText = finalText.filterThinkTagContent().trim()
+        }
 
         let updateCompletion = { [weak result] in
             guard let result else { return }
diff --git a/Easydict/Swift/Service/OpenAI/StreamService.swift b/Easydict/Swift/Service/OpenAI/StreamService.swift
index 43308c113..173dc11c7 100644
--- a/Easydict/Swift/Service/OpenAI/StreamService.swift
+++ b/Easydict/Swift/Service/OpenAI/StreamService.swift
@@ -223,6 +223,14 @@ public class StreamService: QueryService {
         serviceDefaultsKey(.serviceUsageStatus, defaultValue: .default)
     }
 
+    var thinkTagKey: Defaults.Key<Bool> {
+        boolDefaultsKey(.thinkTag, defaultValue: true)
+    }
+
+    var hideThinkTagContent: Bool {
+        Defaults[thinkTagKey]
+    }
+
     // In general, LLM services need to observe these keys to enable validation button.
     var observeKeys: [Defaults.Key<String>] {
         [
diff --git a/Easydict/Swift/Utility/Extensions/String/String+Regex.swift b/Easydict/Swift/Utility/Extensions/String/String+Regex.swift
index acec725bf..6895a59b9 100644
--- a/Easydict/Swift/Utility/Extensions/String/String+Regex.swift
+++ b/Easydict/Swift/Utility/Extensions/String/String+Regex.swift
@@ -7,6 +7,7 @@
 //
 
 import Foundation
+import RegexBuilder
 
 extension String {
     func extract(withPattern pattern: String) -> String? {
@@ -24,3 +25,37 @@ extension String {
         return nil
     }
 }
+
+extension String {
+    /// Filter ^<think>...</think> tag content.
+    /// Example:
+    /// - "<think>hello" -> ""
+    /// - "<think></think>hello" -> "hello"
+    /// - "<think>hello</think>world" -> "world"
+    /// - "hello<think>world</think>" -> "hello<think>world</think>"
+    /// - "no tags here" -> "no tags here"
+    func filterThinkTagContent() -> String {
+        filterTagContent("think")
+    }
+
+    func filterTagContent(_ tag: String) -> String {
+        let startTag = "<\(tag)>"
+        let endTag = "</\(tag)>"
+
+        // Tag pattern
+        let tagPattern = Regex {
+            Anchor.startOfSubject
+            startTag
+            ZeroOrMore {
+                // Match any character (non-greedy) until </tag> is found
+                NegativeLookahead(endTag)
+                CharacterClass.any
+            }
+            // Match the closing tag if it exists
+            Optionally(endTag)
+        }
+
+        // Replace all matches with an empty string
+        return replacing(tagPattern, with: "")
+    }
+}
diff --git a/Easydict/Swift/View/SettingView/Tabs/ServiceConfigurationView/ConfigurationView/StreamConfigurationView.swift b/Easydict/Swift/View/SettingView/Tabs/ServiceConfigurationView/ConfigurationView/StreamConfigurationView.swift
index a6a22a617..512dd62a5 100644
--- a/Easydict/Swift/View/SettingView/Tabs/ServiceConfigurationView/ConfigurationView/StreamConfigurationView.swift
+++ b/Easydict/Swift/View/SettingView/Tabs/ServiceConfigurationView/ConfigurationView/StreamConfigurationView.swift
@@ -27,7 +27,8 @@ struct StreamConfigurationView: View {
         showTranslationToggle: Bool = true,
         showSentenceToggle: Bool = true,
         showDictionaryToggle: Bool = true,
-        showUsageStatusPicker: Bool = true
+        showUsageStatusPicker: Bool = true,
+        showThinkTagContent: Bool = true
     ) {
         self.service = service
 
@@ -41,6 +42,7 @@ struct StreamConfigurationView: View {
         self.showSentenceToggle = showSentenceToggle
         self.showDictionaryToggle = showDictionaryToggle
         self.showUsageStatusPicker = showUsageStatusPicker
+        self.showThinkTagSection = showThinkTagContent
 
         // Disable user to edit built-in supported models.
         self.isEditable = service.serviceType() != .builtInAI
@@ -66,6 +68,7 @@ struct StreamConfigurationView: View {
     let showSentenceToggle: Bool
     let showDictionaryToggle: Bool
     let showUsageStatusPicker: Bool
+    let showThinkTagSection: Bool
 
     var isEditable = true
 
@@ -176,6 +179,13 @@ struct StreamConfigurationView: View {
                     values: ServiceUsageStatus.allCases
                 )
             }
+
+            if showThinkTagSection {
+                ToggleCell(
+                    titleKey: "service.configuration.openai.hide_think_tag_content.title",
+                    key: service.thinkTagKey
+                )
+            }
         }
     }
 }
diff --git a/EasydictSwiftTests/Test.swift b/EasydictSwiftTests/Test.swift
index e1fe6964b..14b0d6b7f 100644
--- a/EasydictSwiftTests/Test.swift
+++ b/EasydictSwiftTests/Test.swift
@@ -91,3 +91,20 @@ import Translation
     }
     #expect(true, "Concurrent test getSelectedText completed without crash")
 }
+
+@Test func testFilterThinkTags() {
+    let testCases: [(input: String, expected: String)] = [
+        ("<think>hello", ""),
+        ("<think></think>hello", "hello"),
+        ("<think>hello</think>world", "world"),
+        ("hello<think>world</think>", "hello<think>world</think>"),
+        ("no tags here", "no tags here"),
+        ("", ""),
+    ]
+
+    for (index, testCase) in testCases.enumerated() {
+        let result = testCase.input.filterThinkTagContent()
+        print("Test Case \(index + 1): \(result)")
+        #expect(result == testCase.expected)
+    }
+}