diff --git a/plugins/wasm-go/extensions/ai-proxy/provider/bedrock.go b/plugins/wasm-go/extensions/ai-proxy/provider/bedrock.go
index c78b2d9ed..e84603a3e 100644
--- a/plugins/wasm-go/extensions/ai-proxy/provider/bedrock.go
+++ b/plugins/wasm-go/extensions/ai-proxy/provider/bedrock.go
@@ -35,11 +35,9 @@ const (
 	// converseStream路径 /model/{modelId}/converse-stream
 	bedrockStreamChatCompletionPath = "/model/%s/converse-stream"
 	// invoke_model 路径 /model/{modelId}/invoke
-	bedrockInvokeModelPath      = "/model/%s/invoke"
-	bedrockSignedHeaders        = "host;x-amz-date"
-	requestIdHeader             = "X-Amzn-Requestid"
-	reasoningContextMarkerStart = "<think>"
-	reasoningContextMarkerEnd   = "</think>"
+	bedrockInvokeModelPath = "/model/%s/invoke"
+	bedrockSignedHeaders   = "host;x-amz-date"
+	requestIdHeader        = "X-Amzn-Requestid"
 )
 
 type bedrockProviderInitializer struct{}
@@ -122,7 +120,7 @@ func (b *bedrockProvider) convertEventFromBedrockToOpenAI(ctx wrapper.HttpContex
 		if bedrockEvent.Delta.ReasoningContent != nil {
 			var content string
 			if ctx.GetContext("thinking_start") == nil {
-				content += reasoningContextMarkerStart
+				content += reasoningStartTag
 				ctx.SetContext("thinking_start", true)
 			}
 			content += bedrockEvent.Delta.ReasoningContent.Text
@@ -130,7 +128,7 @@ func (b *bedrockProvider) convertEventFromBedrockToOpenAI(ctx wrapper.HttpContex
 		} else if bedrockEvent.Delta.Text != nil {
 			var content string
 			if ctx.GetContext("thinking_start") != nil && ctx.GetContext("thinking_end") == nil {
-				content += reasoningContextMarkerEnd
+				content += reasoningEndTag
 				ctx.SetContext("thinking_end", true)
 			}
 			content += *bedrockEvent.Delta.Text
@@ -844,7 +842,7 @@ func (b *bedrockProvider) buildChatCompletionResponse(ctx wrapper.HttpContext, b
 		}
 	}
 	if reasoningContent != "" {
-		outputContent = reasoningContextMarkerStart + reasoningContent + reasoningContextMarkerEnd + normalContent
+		outputContent = reasoningStartTag + reasoningContent + reasoningEndTag + normalContent
 	} else {
 		outputContent = normalContent
 	}
diff --git a/plugins/wasm-go/extensions/ai-proxy/provider/vertex.go b/plugins/wasm-go/extensions/ai-proxy/provider/vertex.go
index e98cb7d54..050994757 100644
--- a/plugins/wasm-go/extensions/ai-proxy/provider/vertex.go
+++ b/plugins/wasm-go/extensions/ai-proxy/provider/vertex.go
@@ -31,8 +31,6 @@ const (
 	vertexChatCompletionAction       = "generateContent"
 	vertexChatCompletionStreamAction = "streamGenerateContent?alt=sse"
 	vertexEmbeddingAction            = "predict"
-	reasoningContextMarkerStart      = "<think>"
-	reasoningContextMarkerEnd        = "</think>"
 )
 
 type vertexProviderInitializer struct{}
@@ -278,7 +276,7 @@ func (v *vertexProvider) buildChatCompletionResponse(ctx wrapper.HttpContext, re
 					},
 				}
 			} else if part.Thounght != nil && len(candidate.Content.Parts) > 1 {
-				choice.Message.Content = reasoningContextMarkerStart + part.Text + reasoningContextMarkerEnd + candidate.Content.Parts[1].Text
+				choice.Message.Content = reasoningStartTag + part.Text + reasoningEndTag + candidate.Content.Parts[1].Text
 			} else if part.Text != "" {
 				choice.Message.Content = part.Text
 			}
@@ -339,14 +337,14 @@ func (v *vertexProvider) buildChatCompletionStreamResponse(ctx wrapper.HttpConte
 			}
 		} else if part.Thounght != nil {
 			if ctx.GetContext("thinking_start") == nil {
-				choice.Delta = &chatMessage{Content: reasoningContextMarkerStart + part.Text}
+				choice.Delta = &chatMessage{Content: reasoningStartTag + part.Text}
 				ctx.SetContext("thinking_start", true)
 			} else {
 				choice.Delta = &chatMessage{Content: part.Text}
 			}
 		} else if part.Text != "" {
 			if ctx.GetContext("thinking_start") != nil && ctx.GetContext("thinking_end") == nil {
-				choice.Delta = &chatMessage{Content: reasoningContextMarkerEnd + part.Text}
+				choice.Delta = &chatMessage{Content: reasoningEndTag + part.Text}
 				ctx.SetContext("thinking_end", true)
 			} else {
 				choice.Delta = &chatMessage{Content: part.Text}