diff --git a/packages/paperclip-runner/src/drivers/acpx/codex-runtime-adapter.test.ts b/packages/paperclip-runner/src/drivers/acpx/codex-runtime-adapter.test.ts
index b0ea480a234..6c8f9295f73 100644
--- a/packages/paperclip-runner/src/drivers/acpx/codex-runtime-adapter.test.ts
+++ b/packages/paperclip-runner/src/drivers/acpx/codex-runtime-adapter.test.ts
@@ -952,6 +952,45 @@ describe("Codex ACPX runtime adapter", () => {
     } finally { await port.close({ reason: "fixture done" }); }
   });
 
+  it.each(["cancel", "closeStream"] as const)("retains the bound Grok usage response during %s until the prompt settles", async (stop) => {
+    const runtime = fakeRuntime();
+    const durableRecord = { acpxRecordId: "record-1", acpSessionId: "backend-1", agentSessionId: "agent-1", lastRequestId: "previous" };
+    const durableStore: AcpSessionStore = { load: vi.fn(async () => structuredClone(durableRecord) as never), save: vi.fn() };
+    let created!: AcpRuntimeOptions;
+    let settle!: (value: { status: "completed" }) => void;
+    const result = new Promise<{ status: "completed" }>(resolve => { settle = resolve; });
+    const options = openOptions(fakeCommand());
+    options.profile = { ...options.profile, agent: "grok" };
+    const port = await openCodexAcpxRuntime(options, { createRegistry: () => registry(), createStore: () => durableStore,
+      createRuntime: value => { created = value; return runtime; } });
+    vi.mocked(runtime.startTurn).mockImplementation(input => {
+      durableRecord.lastRequestId = input.requestId;
+      created.onAcpMessage?.("outbound", { id: 1, method: "session/prompt", params: { sessionId: "backend-1" } });
+      return { requestId: input.requestId, promptStarted: Promise.resolve(), events: (async function* () {})(), result,
+        cancel: async () => undefined, closeStream: async () => undefined };
+    });
+    try {
+      const before = await port.getStatus();
+      const turn = port.startTurn({ requestId: "runner-cancelled", text: "fixture" });
+      await turn[stop]({ reason: "fixture stopped" });
+      created.onAcpMessage?.("outbound", { id: 2, method: "session/prompt", params: { sessionId: "backend-1" } });
+      created.onAcpMessage?.("inbound", { id: 1, result: { _meta: {
+        sessionId: "backend-1", promptId: "prompt-1", requestId: "prompt-1",
+        usage: { inputTokens: 50, outputTokens: 5, totalTokens: 55, cachedReadTokens: 20, cacheCreationTokens: 0,
+          reasoningTokens: 2, modelCalls: 1, costUsdTicks: 10000000 },
+      } } });
+      settle({ status: "completed" });
+      await turn.result;
+      const after = await port.getStatus();
+      expect(persistedAcpxTurnUsage(before, after, "runner-cancelled")).toMatchObject({
+        cost: { amount: 0.001, currency: "USD", basis: "turn" },
+        breakdown: { inputTokens: 30, outputTokens: 5, cachedReadTokens: 20, thoughtTokens: 0 },
+      });
+      created.onAcpMessage?.("inbound", { id: 1, error: { message: "late conflicting response" } });
+      expect(await port.getStatus()).toEqual(after);
+    } finally { settle({ status: "completed" }); await port.close({ reason: "fixture done" }); }
+  });
+
   it("reads verified status from durable state without draining live updates", async () => {
     const runtime = fakeRuntime();
     vi.mocked(runtime.getStatus!).mockReturnValue(new Promise(() => {}));
diff --git a/packages/paperclip-runner/src/drivers/acpx/codex-runtime-adapter.ts b/packages/paperclip-runner/src/drivers/acpx/codex-runtime-adapter.ts
index ba1e97ce2ac..48d3eea115c 100644
--- a/packages/paperclip-runner/src/drivers/acpx/codex-runtime-adapter.ts
+++ b/packages/paperclip-runner/src/drivers/acpx/codex-runtime-adapter.ts
@@ -470,7 +470,7 @@ export async function openQualifiedAcpxRuntime(
     onSessionNotification: acceptGoalNotification,
     onAcpMessage: (direction, message) => {
       const active = extensionBoundary.active;
-      if (active && !active.signal.aborted) promptUsage?.observe(direction, message);
+      if (active && (direction === "inbound" || !active.signal.aborted)) promptUsage?.observe(direction, message);
     },
     spawnEnvironment: () => ({
       ...definedEnvironment(options.launchEnvironment),