diff --git a/internal/sdk/ga4.go b/internal/sdk/ga4.go
index c7f72a89..6a2995dd 100644
--- a/internal/sdk/ga4.go
+++ b/internal/sdk/ga4.go
@@ -206,6 +206,6 @@ func SendGA4Event(name string, params map[string]interface{}) {
 	}
 	err := ga4Client.SendEvent(event)
 	if err != nil {
-		log.Error().Err(err).Msg("send GA4 event failed")
+		log.Warn().Err(err).Msg("send GA4 event failed")
 	}
 }
diff --git a/internal/version/VERSION b/internal/version/VERSION
index f82d6beb..e3cc677a 100644
--- a/internal/version/VERSION
+++ b/internal/version/VERSION
@@ -1 +1 @@
-v5.0.0-beta-2506181659
+v5.0.0-beta-2506181717
diff --git a/report.go b/report.go
index b2aa9b1c..0a42c048 100644
--- a/report.go
+++ b/report.go
@@ -14,6 +14,7 @@ import (
 
 	"github.com/httprunner/httprunner/v5/internal/builtin"
 	"github.com/httprunner/httprunner/v5/uixt"
+	"github.com/httprunner/httprunner/v5/uixt/ai"
 	"github.com/pkg/errors"
 	"github.com/rs/zerolog/log"
 )
@@ -262,11 +263,11 @@ func (g *HTMLReportGenerator) getStepLogs(stepName string, startTime int64, elap
 		}
 
 		// Track AI conversation patterns
-		if strings.Contains(logEntry.Message, "log request messages") {
+		if strings.Contains(logEntry.Message, ai.LOG_REQUEST_MESSAGES) {
 			if logTime >= actualStartTime && logTime <= actualEndTime+30000 { // 30s buffer for AI requests
 				inAIConversation = true
 			}
-		} else if strings.Contains(logEntry.Message, "log response message") && inAIConversation {
+		} else if strings.Contains(logEntry.Message, ai.LOG_RESPONSE_MESSAGE) && inAIConversation {
 			// Extend end time to include complete AI conversation, but respect next step boundary
 			extendedEndTime := logTime
 			if nextStepStartTime > 0 && extendedEndTime >= nextStepStartTime {
diff --git a/uixt/ai/session.go b/uixt/ai/session.go
index d5707fe3..ced09e09 100644
--- a/uixt/ai/session.go
+++ b/uixt/ai/session.go
@@ -73,6 +73,11 @@ func (h *ConversationHistory) Clear() {
 	log.Warn().Msg("conversation history cleared completely")
 }
 
+const (
+	LOG_REQUEST_MESSAGES = "log request messages"
+	LOG_RESPONSE_MESSAGE = "log response message"
+)
+
 func logRequest(messages ConversationHistory) {
 	msgs := make(ConversationHistory, 0, len(messages))
 	for _, message := range messages {
@@ -99,7 +104,7 @@ func logRequest(messages ConversationHistory) {
 		}
 		msgs = append(msgs, msg)
 	}
-	log.Debug().Interface("messages", msgs).Msg("log request messages")
+	log.Debug().Interface("messages", msgs).Msg(LOG_REQUEST_MESSAGES)
 }
 
 func logResponse(message *schema.Message) {
@@ -126,5 +131,5 @@ func logResponse(message *schema.Message) {
 	if message.Extra != nil {
 		logger = logger.Interface("extra", message.Extra)
 	}
-	logger.Msg("log response message")
+	logger.Msg(LOG_RESPONSE_MESSAGE)
 }
diff --git a/uixt/ai/utils.go b/uixt/ai/utils.go
index ddc0b014..1a6b1748 100644
--- a/uixt/ai/utils.go
+++ b/uixt/ai/utils.go
@@ -24,6 +24,45 @@ type PlanningJSONResponse struct {
 	Error   string   `json:"error"`
 }
 
+// parseStructuredResponse parses model response into structured format with error recovery
+func parseStructuredResponse(content string, result interface{}) error {
+	// Clean and validate UTF-8 content first
+	cleanContent := sanitizeUTF8Content(content)
+
+	// Extract JSON content from response
+	jsonContent := extractJSONFromContent(cleanContent)
+	if jsonContent == "" {
+		// If JSON extraction failed, try parsing the content directly as a fallback
+		jsonContent = cleanContent
+	}
+
+	// Parse JSON response with error recovery
+	return parseJSONWithFallback(jsonContent, result)
+}
+
+// sanitizeUTF8Content cleans invalid UTF-8 characters from content
+func sanitizeUTF8Content(content string) string {
+	if utf8.ValidString(content) {
+		return content
+	}
+
+	// Convert to bytes and filter out invalid UTF-8 sequences
+	bytes := []byte(content)
+	var validBytes []byte
+
+	for len(bytes) > 0 {
+		r, size := utf8.DecodeRune(bytes)
+		if r != utf8.RuneError {
+			// Valid rune, keep it
+			validBytes = append(validBytes, bytes[:size]...)
+		}
+		// Skip invalid bytes (including RuneError)
+		bytes = bytes[size:]
+	}
+
+	return string(validBytes)
+}
+
 // extractJSONFromContent extracts JSON content from various formats in the response
 // This function handles multiple formats:
 // 1. ```json ... ``` markdown code blocks
@@ -121,29 +160,6 @@ func extractJSONFromContent(content string) string {
 	return ""
 }
 
-// sanitizeUTF8Content cleans invalid UTF-8 characters from content
-func sanitizeUTF8Content(content string) string {
-	if utf8.ValidString(content) {
-		return content
-	}
-
-	// Convert to bytes and filter out invalid UTF-8 sequences
-	bytes := []byte(content)
-	var validBytes []byte
-
-	for len(bytes) > 0 {
-		r, size := utf8.DecodeRune(bytes)
-		if r != utf8.RuneError {
-			// Valid rune, keep it
-			validBytes = append(validBytes, bytes[:size]...)
-		}
-		// Skip invalid bytes (including RuneError)
-		bytes = bytes[size:]
-	}
-
-	return string(validBytes)
-}
-
 // parseJSONWithFallback attempts to parse JSON with multiple strategies for any struct type
 func parseJSONWithFallback(jsonContent string, result interface{}) error {
 	// Strategy 1: Direct JSON unmarshaling
@@ -432,22 +448,6 @@ func extractPlanningFieldsManually(content string) (*PlanningJSONResponse, error
 	return result, nil
 }
 
-// parseStructuredResponse parses model response into structured format with error recovery
-func parseStructuredResponse(content string, result interface{}) error {
-	// Clean and validate UTF-8 content first
-	cleanContent := sanitizeUTF8Content(content)
-
-	// Extract JSON content from response
-	jsonContent := extractJSONFromContent(cleanContent)
-	if jsonContent == "" {
-		// If JSON extraction failed, try parsing the content directly as a fallback
-		jsonContent = cleanContent
-	}
-
-	// Parse JSON response with error recovery
-	return parseJSONWithFallback(jsonContent, result)
-}
-
 // callModelWithLogging is a common function to call model with logging and timing
 // It handles the common pattern of:
 // 1. Log request