diff --git a/solon-ai-core/src/main/java/org/noear/solon/ai/chat/message/AssistantMessage.java b/solon-ai-core/src/main/java/org/noear/solon/ai/chat/message/AssistantMessage.java
index 07c8b9cebbf8338f8320b8dfca316625d5e91bfa..1b4173fb42e19551d1e7258e409b69b47dc27f8d 100644
--- a/solon-ai-core/src/main/java/org/noear/solon/ai/chat/message/AssistantMessage.java
+++ b/solon-ai-core/src/main/java/org/noear/solon/ai/chat/message/AssistantMessage.java
@@ -90,7 +90,7 @@ public class AssistantMessage extends ChatMessageBase<AssistantMessage> {
                 resultContent = "";
             } else {
                 int tinkIndex = content.indexOf("</think>");
-                if (tinkIndex > 0) {
+                if (tinkIndex > -1) {
                     resultContent = content.substring(tinkIndex + 8).trim();
                 } else {
                     resultContent = content;