diff --git a/roboco/runtime/orchestrator.py b/roboco/runtime/orchestrator.py
index d7e33dd0..6ca92cfa 100644
--- a/roboco/runtime/orchestrator.py
+++ b/roboco/runtime/orchestrator.py
@@ -4504,6 +4504,13 @@ class AgentOrchestrator:
                     error=str(exc),
                 )
                 continue
+            # F040: finalize the spawn session BEFORE popping the instance so
+            # the captured usage/cost is recorded in the DB/dashboard.
+            # _finalize_spawn_session reads self._instances[agent_id] for the
+            # model + usage_session_id; popping first would lose them and leave
+            # the session row open (ended_at IS NULL) — the burn invisible.
+            with contextlib.suppress(Exception):
+                await self._finalize_spawn_session(agent_id, exit_reason="cost_cap")
             self._instances.pop(agent_id, None)
             # Interactive roles (intake/secretary) have an open panel relay; a
             # raw kill would leave the SSE hanging (frozen chat). Close it with a
diff --git a/tests/unit/runtime/test_grok_cost_budget.py b/tests/unit/runtime/test_grok_cost_budget.py
index 739ecbb2..6e45f2e5 100644
--- a/tests/unit/runtime/test_grok_cost_budget.py
+++ b/tests/unit/runtime/test_grok_cost_budget.py
@@ -56,6 +56,27 @@ async def test_cost_over_cap_kills_and_evicts(monkeypatch: pytest.MonkeyPatch) -
     assert "be-dev-1" not in orch._instances
 
 
+@pytest.mark.asyncio
+async def test_cost_over_cap_finalizes_spawn_session_before_evict(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    # F040: a cost-cap-killed grok container must finalize its spawn session so
+    # the captured usage/cost is recorded in the DB/dashboard — otherwise the
+    # session row stays open (ended_at IS NULL) and the burn is invisible.
+    # Finalization must run BEFORE the instance is popped: _finalize_spawn_session
+    # reads self._instances[agent_id] for the model + usage_session_id.
+    orch, _remove_mock = _orch(monkeypatch, cap=5.0, cost=7.5)
+    finalize = AsyncMock()
+    monkeypatch.setattr(orch, "_finalize_spawn_session", finalize)
+
+    await orch._enforce_grok_cost_budget()
+
+    finalize.assert_awaited_once()
+    # finalize ran with the agent still registered (so it could read the model +
+    # usage_session_id), and the instance was evicted only after.
+    assert finalize.await_args.args[0] == "be-dev-1"
+
+
 @pytest.mark.asyncio
 async def test_cost_under_cap_spares(monkeypatch: pytest.MonkeyPatch) -> None:
     orch, remove_mock = _orch(monkeypatch, cap=5.0, cost=1.0)