diff --git a/packages/backend/server/src/plugins/copilot/resolver.ts b/packages/backend/server/src/plugins/copilot/resolver.ts
index e0fa5ac1d..f1317998a 100644
--- a/packages/backend/server/src/plugins/copilot/resolver.ts
+++ b/packages/backend/server/src/plugins/copilot/resolver.ts
@@ -64,6 +64,12 @@ class CreateChatSessionInput {
 
   @Field(() => Boolean, { nullable: true })
   pinned?: boolean;
+
+  @Field(() => Boolean, {
+    nullable: true,
+    description: 'true by default, compliant for old version',
+  })
+  reuseLatestChat?: boolean;
 }
 
 @InputType()
diff --git a/packages/backend/server/src/plugins/copilot/session.ts b/packages/backend/server/src/plugins/copilot/session.ts
index dbd57fc95..467cfdae1 100644
--- a/packages/backend/server/src/plugins/copilot/session.ts
+++ b/packages/backend/server/src/plugins/copilot/session.ts
@@ -446,7 +446,7 @@ export class ChatSessionService {
         // when client create chat session, we always find root session
         parentSessionId: null,
       },
-      true
+      options.reuseLatestChat ?? true
     );
   }
 
diff --git a/packages/backend/server/src/plugins/copilot/types.ts b/packages/backend/server/src/plugins/copilot/types.ts
index fc8186cd9..b34beeb84 100644
--- a/packages/backend/server/src/plugins/copilot/types.ts
+++ b/packages/backend/server/src/plugins/copilot/types.ts
@@ -76,6 +76,7 @@ export interface ChatSessionOptions {
   docId: string | null;
   promptName: string;
   pinned: boolean;
+  reuseLatestChat?: boolean;
 }
 
 export interface ChatSessionForkOptions
diff --git a/packages/backend/server/src/schema.gql b/packages/backend/server/src/schema.gql
index 1e3258a3e..6d8081598 100644
--- a/packages/backend/server/src/schema.gql
+++ b/packages/backend/server/src/schema.gql
@@ -453,6 +453,9 @@ input CreateChatSessionInput {
 
   """The prompt name to use for the session"""
   promptName: String!
+
+  """true by default, compliant for old version"""
+  reuseLatestChat: Boolean
   workspaceId: String!
 }
 
diff --git a/packages/common/graphql/src/schema.ts b/packages/common/graphql/src/schema.ts
index 218b14ed2..b858db634 100644
--- a/packages/common/graphql/src/schema.ts
+++ b/packages/common/graphql/src/schema.ts
@@ -552,6 +552,8 @@ export interface CreateChatSessionInput {
   pinned?: InputMaybe<Scalars['Boolean']['input']>;
   /** The prompt name to use for the session */
   promptName: Scalars['String']['input'];
+  /** true by default, compliant for old version */
+  reuseLatestChat?: InputMaybe<Scalars['Boolean']['input']>;
   workspaceId: Scalars['String']['input'];
 }