diff --git a/src/chat/sessionBridge.ts b/src/chat/sessionBridge.ts
index b59d32b..855789b 100644
--- a/src/chat/sessionBridge.ts
+++ b/src/chat/sessionBridge.ts
@@ -31,6 +31,7 @@ export class ChatSessionBridge {
   // runtime session 仅在单次请求生命周期内有效；线程连续性由 clientSessionId 对应的持久状态承担。
   private readonly activeRuntimeSessions = new Map<string, string>();
   private readonly activeSensitiveContexts = new Map<string, ChatRequestContext>();
+  private readonly abortControllers = new Map<string, AbortController>();
   private readonly toolContextStore = new ToolSessionContextStore();
 
   constructor(private readonly runtime: OpencodeRuntimeAdapter) {}
@@ -89,6 +90,14 @@ export class ChatSessionBridge {
     return this.activeSensitiveContexts.get(sessionScopeKey) ?? null;
   }
 
+  registerAbortController(clientSessionId: string, controller: AbortController) {
+    this.abortControllers.set(clientSessionId, controller);
+  }
+
+  deleteAbortController(clientSessionId: string) {
+    this.abortControllers.delete(clientSessionId);
+  }
+
   async abort(context: {
     clientSessionId?: string;
   }): Promise<SessionBinding | null> {
@@ -144,11 +153,18 @@ export class ChatSessionBridge {
 
   private async abortActiveRuntime(clientSessionId: string) {
     const activeSessionId = this.activeRuntimeSessions.get(clientSessionId);
+    this.activeRuntimeSessions.delete(clientSessionId);
+    this.activeSensitiveContexts.delete(findScopeKey(this.activeSensitiveContexts, clientSessionId));
+
+    const controller = this.abortControllers.get(clientSessionId);
+    if (controller) {
+      this.abortControllers.delete(clientSessionId);
+      controller.abort();
+    }
+
     if (!activeSessionId) {
       return;
     }
-    this.activeRuntimeSessions.delete(clientSessionId);
-    this.activeSensitiveContexts.delete(findScopeKey(this.activeSensitiveContexts, clientSessionId));
     await this.toolContextStore.remove(activeSessionId).catch(() => undefined);
     await this.runtime.abortSession(activeSessionId).catch((error) => {
       logger.warn(
diff --git a/src/routes/chat.ts b/src/routes/chat.ts
index 25e153a..9bd18ae 100644
--- a/src/routes/chat.ts
+++ b/src/routes/chat.ts
@@ -505,6 +505,7 @@ export const buildChatRouter = (
       const clientSessionId = requestContext.clientSessionId;
       let streamClosed = false;
       const abortController = new AbortController();
+      sessionBridge.registerAbortController(clientSessionId, abortController);
       const handleClientClose = () => {
         if (streamClosed || abortController.signal.aborted) {
           return;
@@ -606,6 +607,7 @@ export const buildChatRouter = (
         }
       } finally {
         await sessionBridge.releaseRuntimeSession(clientSessionId, binding.sessionId);
+        sessionBridge.deleteAbortController(clientSessionId);
         streamClosed = true;
         req.off("close", handleClientClose);
         res.off("close", handleClientClose);