diff --git a/astrbot/core/provider/sources/anthropic_source.py b/astrbot/core/provider/sources/anthropic_source.py
index 83f2e16db..764457759 100644
--- a/astrbot/core/provider/sources/anthropic_source.py
+++ b/astrbot/core/provider/sources/anthropic_source.py
@@ -293,7 +293,7 @@ class ProviderAnthropic(Provider):
         extra_body = self.provider_config.get("custom_extra_body", {})
 
         if "max_tokens" not in payloads:
-            payloads["max_tokens"] = 1024
+            payloads["max_tokens"] = 65536
         self._apply_thinking_config(payloads)
 
         try:
@@ -389,7 +389,7 @@ class ProviderAnthropic(Provider):
         reasoning_signature = ""
 
         if "max_tokens" not in payloads:
-            payloads["max_tokens"] = 1024
+            payloads["max_tokens"] = 65536
         self._apply_thinking_config(payloads)
 
         async with self.client.messages.stream(