diff --git a/Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Domain/Managers/AiGateWayManager.cs b/Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Domain/Managers/AiGateWayManager.cs
index 7377423a..9a07479a 100644
--- a/Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Domain/Managers/AiGateWayManager.cs
+++ b/Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Domain/Managers/AiGateWayManager.cs
@@ -96,7 +96,7 @@ public class AiGateWayManager : DomainService
         if (!string.IsNullOrEmpty(aiModelDescribe.ModelId) &&
             aiModelDescribe.ModelId.StartsWith("yi-", StringComparison.OrdinalIgnoreCase))
         {
-            aiModelDescribe.ModelId = aiModelDescribe.ModelId[^3..];
+            aiModelDescribe.ModelId = aiModelDescribe.ModelId[3..];
         }
         return aiModelDescribe;
     }
@@ -518,7 +518,11 @@ public class AiGateWayManager : DomainService
         var chatService =
             LazyServiceProvider.GetRequiredKeyedService<IAnthropicChatCompletionService>(modelDescribe.HandlerName);
         var data = await chatService.ChatCompletionsAsync(modelDescribe, request, cancellationToken);
-
+        if (!string.IsNullOrEmpty(request.Model) &&
+            request.Model.StartsWith("yi-", StringComparison.OrdinalIgnoreCase))
+        {
+            request.Model = request.Model[3..];
+        }
         data.SupplementalMultiplier(modelDescribe.Multiplier);
 
         if (userId is not null)
@@ -585,7 +589,7 @@ public class AiGateWayManager : DomainService
         if (!string.IsNullOrEmpty(request.Model) &&
             request.Model.StartsWith("yi-", StringComparison.OrdinalIgnoreCase))
         {
-            request.Model = request.Model[^3..];
+            request.Model = request.Model[3..];
         }
         
         var completeChatResponse = chatService.StreamChatCompletionsAsync(modelDescribe, request, cancellationToken);