diff --git a/install.sh b/install.sh
index 2d9a368555..efabe15a70 100755
--- a/install.sh
+++ b/install.sh
@@ -729,12 +729,13 @@ if [ "$OS" = "macos" ] && [ "$_ARCH" = "x86_64" ]; then
     # sysctl hw.optional.arm64 returns "1" on Apple Silicon even in Rosetta.
     if [ "$(sysctl -in hw.optional.arm64 2>/dev/null || echo 0)" = "1" ]; then
         echo ""
-        echo "  WARNING: Apple Silicon detected, but this shell is running under Rosetta (x86_64)."
-        echo "  Re-run install.sh from a native arm64 terminal for full PyTorch support."
-        echo "  Continuing in GGUF-only mode for now."
+        echo "  NOTE: Apple Silicon detected under Rosetta (x86_64 shell)."
+        echo "  Overriding to arm64 for correct binaries."
         echo ""
+        _ARCH="arm64"
+    else
+        MAC_INTEL=true
     fi
-    MAC_INTEL=true
 fi
 
 if [ -n "$_USER_PYTHON" ]; then
diff --git a/studio/install_llama_prebuilt.py b/studio/install_llama_prebuilt.py
index 76d22984d7..7924afb205 100755
--- a/studio/install_llama_prebuilt.py
+++ b/studio/install_llama_prebuilt.py
@@ -1993,6 +1993,18 @@ def run_capture(
 def detect_host() -> HostInfo:
     system = platform.system()
     machine = platform.machine().lower()
+    # macOS Rosetta: platform.machine() reports x86_64 on Apple Silicon.
+    # Detect the real hardware via sysctl so we download arm64 binaries.
+    if system == "Darwin" and machine in {"x86_64", "amd64"}:
+        try:
+            r = subprocess.run(
+                ["sysctl", "-in", "hw.optional.arm64"],
+                capture_output=True, text=True, timeout=5,
+            )
+            if r.stdout.strip() == "1":
+                machine = "arm64"
+        except Exception:
+            pass
     is_windows = system == "Windows"
     is_linux = system == "Linux"
     is_macos = system == "Darwin"