diff --git a/metagpt/provider/openai_api.py b/metagpt/provider/openai_api.py
index 11b1d38cb..8cb503572 100644
--- a/metagpt/provider/openai_api.py
+++ b/metagpt/provider/openai_api.py
@@ -103,7 +103,7 @@ class OpenAILLM(BaseLLM):
             if finish_reason:
                 if hasattr(chunk, "usage"):
                     # Some services have usage as an attribute of the chunk, such as Fireworks
-                    usage = CompletionUsage(**chunk.usage)
+                    usage = CompletionUsage(**chunk.usage) if isinstance(chunk.usage, dict) else chunk.usage
                 elif hasattr(chunk.choices[0], "usage"):
                     # The usage of some services is an attribute of chunk.choices[0], such as Moonshot
                     usage = CompletionUsage(**chunk.choices[0].usage)