fix: Mistral Small 4 fails to start due to config/weight format mismatch (#21620)

Co-authored-by: mengxiancheng03 <mengxiancheng03@kuaishou.com>
Co-authored-by: Baizhou Zhang <sobereddiezhang@gmail.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

test/registered/models/test_ministral4_models.py

@@ -0,0 +1,32 @@
+import unittest
+
+from sglang.test.ci.ci_register import register_cuda_ci
+from sglang.test.kits.eval_accuracy_kit import GSM8KMixin
+from sglang.test.kits.mmmu_vlm_kit import MMMUMixin
+from sglang.test.server_fixtures.default_fixture import DefaultServerBase
+from sglang.test.server_fixtures.mmmu_fixture import MMMUServerBase
+
+register_cuda_ci(
+    est_time=200,
+    suite="stage-b-test-2-gpu-large",
+)
+
+MODEL = "mistralai/Mistral-Small-4-119B-2603"
+
+
+class TestMistralSmall4TextOnly(GSM8KMixin, DefaultServerBase):
+    gsm8k_accuracy_thres = 0.9
+    model = MODEL
+    other_args = ["--tp-size", "2", "--trust-remote-code"]
+
+
+class TestMistralSmall4MMMU(MMMUMixin, MMMUServerBase):
+    accuracy = 0.45
+    model = MODEL
+    other_args = ["--tp-size", "2", "--trust-remote-code"]
+    mmmu_args = ["--limit=0.1"]
+    """`--limit=0.1`: 10 percent of each task - this is fine for testing since the nominal result isn't interesting - this run is just to prevent relative regressions."""
+
+
+if __name__ == "__main__":
+    unittest.main()