diff --git a/relay/channel/openai/relay_responses.go b/relay/channel/openai/relay_responses.go
index 444a42cc4..e77080e63 100644
--- a/relay/channel/openai/relay_responses.go
+++ b/relay/channel/openai/relay_responses.go
@@ -109,7 +109,7 @@ func OaiResponsesStreamHandler(c *gin.Context, info *relaycommon.RelayInfo, resp
 	}
 
 	if usage.PromptTokens == 0 && usage.CompletionTokens != 0 {
-		usage.PromptTokens = usage.CompletionTokens
+		usage.PromptTokens = info.PromptTokens
 	} else {
 		usage.TotalTokens = usage.PromptTokens + usage.CompletionTokens
 	}