diff --git a/core/relay/model/claude.go b/core/relay/model/claude.go
index 69a02af4..d0f2162d 100644
--- a/core/relay/model/claude.go
+++ b/core/relay/model/claude.go
@@ -54,8 +54,8 @@ type ClaudeImageSource struct {
 
 type ClaudeContent struct {
 	Type         string              `json:"type"`
-	Text         string              `json:"text"`
-	Thinking     string              `json:"thinking"`
+	Text         string              `json:"text,omitempty"`
+	Thinking     string              `json:"thinking,omitempty"`
 	Source       *ClaudeImageSource  `json:"source,omitempty"`
 	ID           string              `json:"id,omitempty"`
 	Name         string              `json:"name,omitempty"`