diff --git a/apps/server/src/orchestration/Layers/ProviderCommandReactor.test.ts b/apps/server/src/orchestration/Layers/ProviderCommandReactor.test.ts
index 2cde405ad..c2c43d9fa 100644
--- a/apps/server/src/orchestration/Layers/ProviderCommandReactor.test.ts
+++ b/apps/server/src/orchestration/Layers/ProviderCommandReactor.test.ts
@@ -1143,6 +1143,7 @@ describe("ProviderCommandReactor", () => {
     await waitFor(() => harness.interruptTurn.mock.calls.length === 1);
     expect(harness.interruptTurn.mock.calls[0]?.[0]).toEqual({
       threadId: "thread-1",
+      turnId: "turn-1",
     });
   });
 
diff --git a/apps/server/src/orchestration/Layers/ProviderCommandReactor.ts b/apps/server/src/orchestration/Layers/ProviderCommandReactor.ts
index a6f92c74c..dead00300 100644
--- a/apps/server/src/orchestration/Layers/ProviderCommandReactor.ts
+++ b/apps/server/src/orchestration/Layers/ProviderCommandReactor.ts
@@ -715,7 +715,10 @@ const make = Effect.gen(function* () {
     }
 
     // Orchestration turn ids are not provider turn ids, so interrupt by session.
-    yield* providerService.interruptTurn({ threadId: event.payload.threadId });
+    yield* providerService.interruptTurn({
+      threadId: event.payload.threadId,
+      ...(event.payload.turnId !== undefined ? { turnId: event.payload.turnId } : {}),
+    });
   });
 
   const processApprovalResponseRequested = Effect.fnUntraced(function* (
diff --git a/apps/web/src/components/ChatView.browser.tsx b/apps/web/src/components/ChatView.browser.tsx
index f02665a5c..e6147f1f3 100644
--- a/apps/web/src/components/ChatView.browser.tsx
+++ b/apps/web/src/components/ChatView.browser.tsx
@@ -1598,6 +1598,42 @@ describe("ChatView timeline estimator parity (full app)", () => {
     }
   });
 
+  it("includes the active turn id when stopping a running turn", async () => {
+    wsRequests.length = 0;
+
+    const mounted = await mountChatView({
+      viewport: DEFAULT_VIEWPORT,
+      snapshot: createSnapshotForTargetUser({
+        targetMessageId: "msg-user-stop-button-turn-id" as MessageId,
+        targetText: "stop button turn id target",
+        sessionStatus: "running",
+        activeTurnId: "turn-stop-button-turn-id" as TurnId,
+      }),
+    });
+
+    try {
+      const stopButton = await waitForElement(
+        () => document.querySelector<HTMLButtonElement>('button[aria-label="Stop generation"]'),
+        "Unable to find stop generation button.",
+      );
+
+      stopButton.click();
+
+      await vi.waitFor(
+        () =>
+          wsRequests.some(
+            (request) =>
+              request._tag === ORCHESTRATION_WS_METHODS.dispatchCommand &&
+              request.type === "thread.turn.interrupt" &&
+              request.turnId === "turn-stop-button-turn-id",
+          ),
+        { timeout: 8_000, interval: 16 },
+      );
+    } finally {
+      await mounted.cleanup();
+    }
+  });
+
   it("keeps the new thread selected after clicking the new-thread button", async () => {
     const mounted = await mountChatView({
       viewport: DEFAULT_VIEWPORT,
diff --git a/apps/web/src/components/ChatView.tsx b/apps/web/src/components/ChatView.tsx
index 72dbcf66e..6d1ee65cc 100644
--- a/apps/web/src/components/ChatView.tsx
+++ b/apps/web/src/components/ChatView.tsx
@@ -3867,6 +3867,10 @@ export default function ChatView({
       type: "thread.turn.interrupt",
       commandId: newCommandId(),
       threadId: activeThread.id,
+      ...(activeThread.session?.activeTurnId !== undefined &&
+      activeThread.session?.activeTurnId !== null
+        ? { turnId: activeThread.session.activeTurnId }
+        : {}),
       createdAt: new Date().toISOString(),
     });
   };