diff --git a/backend/internal/service/account_test_service.go b/backend/internal/service/account_test_service.go
index c55e418d..65708bd9 100644
--- a/backend/internal/service/account_test_service.go
+++ b/backend/internal/service/account_test_service.go
@@ -33,7 +33,7 @@ import (
 var sseDataPrefix = regexp.MustCompile(`^data:\s*`)
 
 const (
-	testClaudeAPIURL   = "https://api.anthropic.com/v1/messages"
+	testClaudeAPIURL   = "https://api.anthropic.com/v1/messages?beta=true"
 	chatgptCodexAPIURL = "https://chatgpt.com/backend-api/codex/responses"
 	soraMeAPIURL       = "https://sora.chatgpt.com/backend/me" // Sora 用户信息接口，用于测试连接
 	soraBillingAPIURL  = "https://sora.chatgpt.com/backend/billing/subscriptions"
@@ -238,7 +238,7 @@ func (s *AccountTestService) testClaudeAccountConnection(c *gin.Context, account
 		if err != nil {
 			return s.sendErrorAndEnd(c, fmt.Sprintf("Invalid base URL: %s", err.Error()))
 		}
-		apiURL = strings.TrimSuffix(normalizedBaseURL, "/") + "/v1/messages"
+		apiURL = strings.TrimSuffix(normalizedBaseURL, "/") + "/v1/messages?beta=true"
 	} else {
 		return s.sendErrorAndEnd(c, fmt.Sprintf("Unsupported account type: %s", account.Type))
 	}
diff --git a/backend/internal/service/gateway_service.go b/backend/internal/service/gateway_service.go
index d26ed24e..132361f4 100644
--- a/backend/internal/service/gateway_service.go
+++ b/backend/internal/service/gateway_service.go
@@ -4583,7 +4583,7 @@ func (s *GatewayService) buildUpstreamRequestAnthropicAPIKeyPassthrough(
 		if err != nil {
 			return nil, err
 		}
-		targetURL = validatedURL + "/v1/messages"
+		targetURL = validatedURL + "/v1/messages?beta=true"
 	}
 
 	req, err := http.NewRequestWithContext(ctx, http.MethodPost, targetURL, bytes.NewReader(body))
@@ -4963,7 +4963,7 @@ func (s *GatewayService) buildUpstreamRequest(ctx context.Context, c *gin.Contex
 			if err != nil {
 				return nil, err
 			}
-			targetURL = validatedURL + "/v1/messages"
+			targetURL = validatedURL + "/v1/messages?beta=true"
 		}
 	}
 
@@ -7088,7 +7088,7 @@ func (s *GatewayService) buildCountTokensRequestAnthropicAPIKeyPassthrough(
 		if err != nil {
 			return nil, err
 		}
-		targetURL = validatedURL + "/v1/messages/count_tokens"
+		targetURL = validatedURL + "/v1/messages/count_tokens?beta=true"
 	}
 
 	req, err := http.NewRequestWithContext(ctx, http.MethodPost, targetURL, bytes.NewReader(body))
@@ -7135,7 +7135,7 @@ func (s *GatewayService) buildCountTokensRequest(ctx context.Context, c *gin.Con
 			if err != nil {
 				return nil, err
 			}
-			targetURL = validatedURL + "/v1/messages/count_tokens"
+			targetURL = validatedURL + "/v1/messages/count_tokens?beta=true"
 		}
 	}