diff --git a/studio/backend/core/inference/diffusion_families.py b/studio/backend/core/inference/diffusion_families.py
index 41125e638b..b3f5da0042 100644
--- a/studio/backend/core/inference/diffusion_families.py
+++ b/studio/backend/core/inference/diffusion_families.py
@@ -363,6 +363,13 @@ _FAMILIES: tuple[DiffusionFamily, ...] = (
     # need the same TE4 assembly for tiny demand, so no GGUF artifact is wired yet.
     DiffusionFamily(
         name = "hidream-i1",
+        # Hosted checkpoints: 28/28 per-case gate pairs per scheme (LPIPS suite means 0.291
+        # int8 / 0.278 fp8, the 50-step trajectory band); int8 verified bit-identical to
+        # on-the-fly quantize across all 1615 state dict tensors.
+        prequant_repos = (
+            ("int8", "unsloth/HiDream-I1-Full-FP8"),
+            ("fp8", "unsloth/HiDream-I1-Full-FP8"),
+        ),
         pipeline_class = "HiDreamImagePipeline",
         transformer_class = "HiDreamImageTransformer2DModel",
         base_repo = "HiDream-ai/HiDream-I1-Full",
diff --git a/studio/backend/tests/test_diffusion_more_families.py b/studio/backend/tests/test_diffusion_more_families.py
index 724cd660d2..67f769fa9c 100644
--- a/studio/backend/tests/test_diffusion_more_families.py
+++ b/studio/backend/tests/test_diffusion_more_families.py
@@ -296,6 +296,16 @@ def test_ideogram4_memory_table_counts_both_dits():
     assert text_encoders_gb > 5.0
 
 
+def test_hidream_prequant_wiring():
+    # Hosted int8/fp8 checkpoints (28/28 per-case gate pairs per scheme; int8 verified
+    # bit-identical to on-the-fly quantize) serve the family default base.
+    from core.inference.diffusion_families import family_prequant_repo
+
+    fam = detect_family("HiDream-ai/HiDream-I1-Full")
+    for scheme in ("int8", "fp8"):
+        assert family_prequant_repo(fam, scheme) == "unsloth/HiDream-I1-Full-FP8"
+
+
 def test_hidream_quant_schemes_not_denied_and_no_extra_excludes():
     # Measured on a B200 (outputs/hidream_smoke): int8 and fp8 both engage and render
     # cleanly, including a 2-3 token prompt on int8 -- the routed MoE expert Linears