diff --git a/metagpt/llm.py b/metagpt/llm.py
index 51ade1f7e..b653df946 100644
--- a/metagpt/llm.py
+++ b/metagpt/llm.py
@@ -18,7 +18,7 @@ from metagpt.provider.human_provider import HumanProvider
 def LLM() -> "BaseGPTAPI":
     """ initialize different LLM instance according to the key field existence"""
     # TODO a little trick, can use registry to initialize LLM instance further
-    if CONFIG.openai_api_key and CONFIG.openai_api_key.startswith("sk-"):
+    if CONFIG.openai_api_key:
         llm = OpenAIGPTAPI()
     elif CONFIG.claude_api_key:
         llm = Claude()