diff --git a/studio/backend/core/inference/diffusion.py b/studio/backend/core/inference/diffusion.py
index 767961695d..1ae3ce2668 100644
--- a/studio/backend/core/inference/diffusion.py
+++ b/studio/backend/core/inference/diffusion.py
@@ -1030,7 +1030,9 @@ class DiffusionBackend:
                     # break the user's bit-exact request (an auto DEFAULT overriding an EXPLICIT
                     # control). Suppress the auto default when speed was explicitly pinned off;
                     # otherwise auto (the dense-capable default) applies.
-                    speed_off = speed_mode is not None and str(speed_mode).strip().lower() == SPEED_OFF
+                    speed_off = (
+                        speed_mode is not None and str(speed_mode).strip().lower() == SPEED_OFF
+                    )
                     # "off" normalizes to None (no dense quant), keeping the GGUF-as-is path.
                     transformer_quant = "off" if speed_off else TQ_AUTO
 
diff --git a/studio/backend/tests/test_diffusion_backend.py b/studio/backend/tests/test_diffusion_backend.py
index 155daff8b1..f210c73b9e 100644
--- a/studio/backend/tests/test_diffusion_backend.py
+++ b/studio/backend/tests/test_diffusion_backend.py
@@ -2105,7 +2105,15 @@ def test_dense_quant_prefetch_needed_gates(fake_runtime, monkeypatch):
 
     seen: list = []
 
-    def fake_candidate(*, fam, target, requested, base_repo = None, prequant_path = None, logger = None):
+    def fake_candidate(
+        *,
+        fam,
+        target,
+        requested,
+        base_repo = None,
+        prequant_path = None,
+        logger = None,
+    ):
         seen.append(requested)
         return object()  # a viable dense-quant candidate (scheme resolves AND disk fits)
 
@@ -2121,9 +2129,7 @@ def test_dense_quant_prefetch_needed_gates(fake_runtime, monkeypatch):
     assert backend._dense_quant_prefetch_needed(fam, {"transformer_quant": "none"}) is False
     # An explicit Speed="off" (bit-exact) load suppresses the dense path -> never widen.
     assert (
-        backend._dense_quant_prefetch_needed(
-            fam, {"transformer_quant": "fp8", "speed_mode": "off"}
-        )
+        backend._dense_quant_prefetch_needed(fam, {"transformer_quant": "fp8", "speed_mode": "off"})
         is False
     )
     # No viable candidate (unsupported scheme / no disk room / a prequant checkpoint shortcut)