diff --git a/backend/internal/service/account_test_service.go b/backend/internal/service/account_test_service.go
index b598ac8ced..7bf02afd51 100644
--- a/backend/internal/service/account_test_service.go
+++ b/backend/internal/service/account_test_service.go
@@ -603,6 +603,13 @@ func (s *AccountTestService) testOpenAIAccountConnection(c *gin.Context, account
 	if isOAuth {
 		req.Host = "chatgpt.com"
 		req.Header.Set("accept", "text/event-stream")
+		req.Header.Set("OpenAI-Beta", "responses=experimental")
+		req.Header.Set("Originator", "codex_cli_rs")
+		if customUA := strings.TrimSpace(credentialAccount.GetOpenAIUserAgent()); customUA != "" {
+			req.Header.Set("User-Agent", customUA)
+		} else {
+			req.Header.Set("User-Agent", codexCLIUserAgent)
+		}
 		setOpenAIChatGPTAccountHeaders(req.Header, credentialAccount)
 	}