diff --git a/backend/internal/service/account_test_service.go b/backend/internal/service/account_test_service.go
index 3290fe52..899a4498 100644
--- a/backend/internal/service/account_test_service.go
+++ b/backend/internal/service/account_test_service.go
@@ -245,7 +245,6 @@ func (s *AccountTestService) testClaudeAccountConnection(c *gin.Context, account
 	// Set common headers
 	req.Header.Set("Content-Type", "application/json")
 	req.Header.Set("anthropic-version", "2023-06-01")
-	req.Header.Set("anthropic-beta", claude.DefaultBetaHeader)
 
 	// Apply Claude Code client headers
 	for key, value := range claude.DefaultHeaders {
@@ -254,8 +253,10 @@ func (s *AccountTestService) testClaudeAccountConnection(c *gin.Context, account
 
 	// Set authentication header
 	if useBearer {
+		req.Header.Set("anthropic-beta", claude.DefaultBetaHeader)
 		req.Header.Set("Authorization", "Bearer "+authToken)
 	} else {
+		req.Header.Set("anthropic-beta", claude.APIKeyBetaHeader)
 		req.Header.Set("x-api-key", authToken)
 	}