diff --git a/astrbot/core/provider/sources/openai_source.py b/astrbot/core/provider/sources/openai_source.py
index a7c5b47059..d08f1c91ca 100644
--- a/astrbot/core/provider/sources/openai_source.py
+++ b/astrbot/core/provider/sources/openai_source.py
@@ -390,7 +390,8 @@ def _extract_reasoning_content(
     def _extract_usage(self, usage: CompletionUsage | dict) -> TokenUsage:
         ptd = getattr(usage, "prompt_tokens_details", None)
         cached = getattr(ptd, "cached_tokens", 0) if ptd else 0
-        prompt_tokens = getattr(usage, "prompt_tokens", 0) or 0
+        cached = cached if isinstance(cached, int) else 0 # ptd.cached_tokens 可能为None
+        prompt_tokens = getattr(usage, "prompt_tokens", 0) or 0 # 安全
         completion_tokens = getattr(usage, "completion_tokens", 0) or 0
         return TokenUsage(
             input_other=prompt_tokens - cached,