diff --git a/openpilot/selfdrive/controls/lib/longitudinal_planner.py b/openpilot/selfdrive/controls/lib/longitudinal_planner.py
index 8b62808dc0..bf91c5e1f9 100755
--- a/openpilot/selfdrive/controls/lib/longitudinal_planner.py
+++ b/openpilot/selfdrive/controls/lib/longitudinal_planner.py
@@ -49,9 +49,8 @@ def get_cruise_accel(e2e, v_cruise, v_ego, a_cruise_prev, angle_steers, CP, dt,
       max_accel = min(max_accel, coast_limit)
 
   target_accel = np.clip(v_cruise - v_ego, A_CRUISE_MIN, max_accel)
-  if not e2e:
-    j_cruise = np.interp(v_ego, A_CRUISE_MAX_BP, J_CRUISE_VALS)
-    target_accel = float(np.clip(target_accel, a_cruise_prev - j_cruise * dt, a_cruise_prev + j_cruise * dt))
+  j_cruise = np.interp(v_ego, A_CRUISE_MAX_BP, J_CRUISE_VALS)
+  target_accel = float(np.clip(target_accel, a_cruise_prev - j_cruise * dt, a_cruise_prev + j_cruise * dt))
 
   return target_accel
 
@@ -65,10 +64,9 @@ class LongitudinalPlanner(LongitudinalPlannerSP):
     self.dt = dt
     self.allow_throttle = True
 
-    self.a_desired = init_a
     self.v_desired_filter = FirstOrderFilter(init_v, 2.0, self.dt)
-    self.a_cruise = 0.0
-    self.output_a_target = 0.0
+    self.a_cruise = init_a
+    self.output_a_target = init_a
     self.output_should_stop = False
 
     self.v_desired_trajectory = np.zeros(CONTROL_N)
@@ -105,7 +103,8 @@ class LongitudinalPlanner(LongitudinalPlannerSP):
 
     if reset_state:
       self.v_desired_filter.x = v_ego
-      self.a_desired = np.clip(sm['carState'].aEgo, ACCEL_MIN, ACCEL_MAX)
+      self.output_a_target = np.clip(sm['carState'].aEgo, ACCEL_MIN, ACCEL_MAX)
+      self.a_cruise = self.output_a_target
 
     # Prevent divergence, smooth in current v_ego
     self.v_desired_filter.x = max(0.0, self.v_desired_filter.update(v_ego))
@@ -113,11 +112,11 @@ class LongitudinalPlanner(LongitudinalPlannerSP):
     # No change cost when user is controlling the speed, or when standstill
     prev_accel_constraint = not (reset_state or sm['carState'].standstill)
 
-    # Get new v_cruise and a_desired from Smart Cruise Control and Speed Limit Assist
-    v_cruise, self.a_desired = LongitudinalPlannerSP.update_targets(self, sm, self.v_desired_filter.x, self.a_desired, v_cruise)
+    # Get new v_cruise and a_target from Smart Cruise Control and Speed Limit Assist
+    v_cruise, self.output_a_target = LongitudinalPlannerSP.update_targets(self, sm, self.v_desired_filter.x, self.output_a_target, v_cruise)
 
     self.mpc.set_weights(prev_accel_constraint, personality=sm['selfdriveState'].personality)
-    self.mpc.set_cur_state(self.v_desired_filter.x, self.a_desired)
+    self.mpc.set_cur_state(self.v_desired_filter.x, self.output_a_target)
     self.mpc.update(sm['radarState'], personality=sm['selfdriveState'].personality)
 
     self.v_desired_trajectory = np.interp(CONTROL_N_T_IDX, T_IDXS_MPC, self.mpc.v_solution)
@@ -130,7 +129,7 @@ class LongitudinalPlanner(LongitudinalPlannerSP):
       cloudlog.info("FCW triggered")
 
     # Save starting point for next iteration
-    a_prev = self.a_desired
+    a_prev = self.output_a_target
 
     action_t =  self.CP.longitudinalActuatorDelay + DT_MDL
     output_a_target_mpc = get_accel_from_plan(self.v_desired_trajectory, self.a_desired_trajectory, CONTROL_N_T_IDX,
@@ -155,7 +154,6 @@ class LongitudinalPlanner(LongitudinalPlannerSP):
     self.output_should_stop = any(should_stop for _, _, should_stop in candidates)
     self.output_a_target = np.clip(output_a_target, ACCEL_MIN, ACCEL_MAX)
 
-    self.a_desired = float(self.output_a_target)
     self.v_desired_filter.x = self.v_desired_filter.x + self.dt * (self.output_a_target + a_prev) / 2.0
 
   def publish(self, sm, pm):
diff --git a/openpilot/system/hardware/hardwared.py b/openpilot/system/hardware/hardwared.py
index 7250cd4d63..3c22f1cbd7 100755
--- a/openpilot/system/hardware/hardwared.py
+++ b/openpilot/system/hardware/hardwared.py
@@ -16,6 +16,7 @@ from openpilot.common.utils import strip_deprecated_keys
 from openpilot.common.filter_simple import FirstOrderFilter
 from openpilot.common.params import Params
 from openpilot.common.realtime import DT_HW
+from openpilot.selfdrive.modeld.helpers import MODELS_DIR, usbgpu_compiled
 from openpilot.selfdrive.selfdrived.alertmanager import set_offroad_alert
 from openpilot.common.hardware import HARDWARE, COMMA_HARDWARE
 from openpilot.common.basedir import BASEDIR
@@ -238,8 +239,7 @@ def hardware_thread(end_event, hw_queue) -> None:
 
   fan_controller = FanController(int(1./DT_HW))
   chestnut = Chestnut()
-  big_model_available = os.path.isfile(os.path.join(BASEDIR, "openpilot/selfdrive/modeld/models/big_driving_supercombo.onnx")) or \
-                        os.path.isfile(os.path.join(BASEDIR, "openpilot/selfdrive/modeld/models/big_driving_tinygrad.pkl.chunkmanifest"))
+  big_model_available = (MODELS_DIR / 'big_driving_supercombo.onnx').is_file() or usbgpu_compiled()
 
   while not end_event.is_set():
     sm.update(PANDA_STATES_TIMEOUT)
diff --git a/openpilot/system/webrtc/tests/test_stream_session.py b/openpilot/system/webrtc/tests/test_stream_session.py
index d64cf6aed6..03d540c3c2 100644
--- a/openpilot/system/webrtc/tests/test_stream_session.py
+++ b/openpilot/system/webrtc/tests/test_stream_session.py
@@ -7,7 +7,7 @@ from openpilot.common.test import OpenpilotTestCase
 from openpilot.cereal import messaging, log
 from teleoprtc.tracks import VIDEO_CLOCK_RATE
 
-from openpilot.system.webrtc.webrtcd import CerealOutgoingMessageProxy, CerealIncomingMessageProxy
+from openpilot.system.webrtc.webrtcd import CerealOutgoingMessageProxy, CerealIncomingMessageProxy, ServerState, handle_get_stream
 from openpilot.system.webrtc.device.video import LiveStreamVideoStreamTrack
 
 
@@ -80,3 +80,8 @@ class TestStreamSession(OpenpilotTestCase):
         start_pts = packet.pts
       assert abs(i + packet.pts - (start_pts + (((time.monotonic_ns() - start_ns) * VIDEO_CLOCK_RATE) // 1_000_000_000))) < 450 #5ms
       assert bytes(packet) == b""
+
+  def test_stream_rejects_non_json_content_type(self):
+    response = self.loop.run_until_complete(handle_get_stream(ServerState(), b"{}", "text/plain"))
+
+    assert response == (415, b'{"error": "unsupported media type"}', "application/json; charset=utf-8")
diff --git a/openpilot/system/webrtc/webrtcd.py b/openpilot/system/webrtc/webrtcd.py
index 8e022eda1c..3c0c3037f3 100755
--- a/openpilot/system/webrtc/webrtcd.py
+++ b/openpilot/system/webrtc/webrtcd.py
@@ -395,7 +395,10 @@ def _text_response(text: str, status: int = 200) -> tuple[int, bytes, str]:
   return (status, text.encode(), "text/plain; charset=utf-8")
 
 
-async def handle_get_stream(state: ServerState, raw_body: bytes) -> tuple[int, bytes, str]:
+async def handle_get_stream(state: ServerState, raw_body: bytes, content_type: str) -> tuple[int, bytes, str]:
+  if content_type != "application/json":
+    return _json_response({"error": "unsupported media type"}, status=415)
+
   stream_dict = state.streams
   body = StreamRequestBody(**json.loads(raw_body))
 
@@ -508,7 +511,7 @@ class WebrtcdHandler(BaseHTTPRequestHandler):
         services = parse_qs(parsed.query).get("services", [""])[0]
         result = self._run(handle_get_schema(self.server.state, services))
       elif parsed.path == "/stream":
-        result = self._run(handle_get_stream(self.server.state, self._read_body()))
+        result = self._run(handle_get_stream(self.server.state, self._read_body(), self.headers.get_content_type()))
       else:  # /notify
         try:
           payload = json.loads(self._read_body())
@@ -611,7 +614,7 @@ def webrtcd_thread(host: str, port: int):
 
 def main():
   parser = argparse.ArgumentParser(description="WebRTC daemon")
-  parser.add_argument("--host", type=str, default="0.0.0.0", help="Host to listen on")
+  parser.add_argument("--host", type=str, default="127.0.0.1", help="Host to listen on")
   parser.add_argument("--port", type=int, default=5001, help="Port to listen on")
   args = parser.parse_args()
 
diff --git a/pyproject.toml b/pyproject.toml
index dcc1024479..6a13796d70 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,7 +21,7 @@ dependencies = [
   "tqdm",         # cars (fw_versions.py) on start + many one-off uses
 
   # core
-  "scons",
+  "scons==4.10.1",  # 4.11 removed the qt3 tool still used to build Cabana
   "pycapnp==2.1.0",  # 2.2 introduces a memory leak due to cyclic references
   "numpy >=2.0",
 
diff --git a/uv.lock b/uv.lock
index 8f3d4ca96c..a7967e8e11 100644
--- a/uv.lock
+++ b/uv.lock
@@ -847,7 +847,7 @@ requires-dist = [
     { name = "rednose", marker = "extra == 'submodules'", editable = "rednose_repo" },
     { name = "requests" },
     { name = "ruff", marker = "extra == 'testing'" },
-    { name = "scons" },
+    { name = "scons", specifier = "==4.10.1" },
     { name = "sentry-sdk" },
     { name = "setproctitle" },
     { name = "sounddevice" },
@@ -1136,11 +1136,11 @@ wheels = [
 
 [[package]]
 name = "scons"
-version = "4.11.0"
+version = "4.10.1"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/dd/82/3c4e089ac8df2eaee8a7f14e489b2a76f94f4c1d8defa4e46c8ad15cae86/scons-4.11.0.tar.gz", hash = "sha256:5ba48f9e2eb6b9178cabdc9893792418e6970c84f43f4b027e4468e20616a89c", size = 3269126, upload-time = "2026-08-11T04:29:45.62Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/7d/c9/2f430bb39e4eccba32ce8008df4a3206df651276422204e177a09e12b30b/scons-4.10.1.tar.gz", hash = "sha256:99c0e94a42a2c1182fa6859b0be697953db07ba936ecc9817ae0d218ced20b15", size = 3258403, upload-time = "2025-11-16T22:43:39.258Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/fc/ac/a4445bbbd58a5fa6a5c8b3b0458ffbee04e4acaff87677058eab9c6af682/scons-4.11.0-py3-none-any.whl", hash = "sha256:2edc077aaeafc43377ba46ce1fa3e7b40edea59c62db9ef7e39e07dc88b754fa", size = 4123742, upload-time = "2026-08-11T04:29:42.881Z" },
+    { url = "https://files.pythonhosted.org/packages/ce/bf/931fb9fbb87234c32b8b1b1c15fba23472a10777c12043336675633809a7/scons-4.10.1-py3-none-any.whl", hash = "sha256:bd9d1c52f908d874eba92a8c0c0a8dcf2ed9f3b88ab956d0fce1da479c4e7126", size = 4136069, upload-time = "2025-11-16T22:43:35.933Z" },
 ]
 
 [[package]]
@@ -1285,7 +1285,6 @@ requires-dist = [
     { name = "pylint", marker = "extra == 'linting'" },
     { name = "pytest", marker = "extra == 'testing-minimal'" },
     { name = "pytest-split", marker = "extra == 'testing-minimal'" },
-    { name = "pytest-timeout", marker = "extra == 'testing-minimal'" },
     { name = "pytest-xdist", marker = "extra == 'testing-minimal'" },
     { name = "ruff", marker = "extra == 'linting'", specifier = "==0.14.10" },
     { name = "safetensors", marker = "extra == 'testing-unit'" },
@@ -1294,6 +1293,7 @@ requires-dist = [
     { name = "tiktoken", marker = "extra == 'testing'" },
     { name = "tinygrad", extras = ["testing-minimal"], marker = "extra == 'testing-unit'" },
     { name = "tinygrad", extras = ["testing-unit"], marker = "extra == 'testing'" },
+    { name = "tinymesa", marker = "extra == 'mesa'", specifier = "==25.2.7.2" },
     { name = "torch", marker = "extra == 'testing-minimal'", specifier = "==2.9.1" },
     { name = "tqdm", marker = "extra == 'testing-unit'" },
     { name = "transformers", marker = "extra == 'testing'" },
@@ -1301,7 +1301,7 @@ requires-dist = [
     { name = "typing-extensions", marker = "extra == 'linting'" },
     { name = "z3-solver", marker = "extra == 'testing-minimal'", specifier = "<4.15.4" },
 ]
-provides-extras = ["linting", "testing-minimal", "testing-unit", "testing", "docs"]
+provides-extras = ["linting", "testing-minimal", "testing-unit", "testing", "docs", "mesa"]
 
 [[package]]
 name = "tomli"