[diffusion] chore: track minimax-h3 in the nightly diffusion benchmark (#34655)

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

scripts/ci/utils/diffusion/comparison_configs.json

@@ -186,6 +186,34 @@
                     "extra_env": {}
                 }
             }
+        },
+        {
+            "id": "minimax_h3_t2va_5s",
+            "model": "MiniMaxAI/MiniMax-H3",
+            "task": "text-to-video",
+            "prompt": "At night, while their owner sleeps in a bedroom, three cats march in loudly playing tiny brass instruments, then abruptly file out.",
+            "width": 1344,
+            "height": 768,
+            "num_frames": 124,
+            "fps": 24,
+            "num_inference_steps": 50,
+            "seed": 1101,
+            "num_gpus": 4,
+            "sglang_request_extra": {
+                "task": "t2va",
+                "conditions": [],
+                "target": {"short_edge": 768, "aspect_ratio": "16:9", "duration_seconds": 5.0},
+                "flow_shift": 12.0,
+                "audio_flow_shift": 3.0,
+                "num_frames": null,
+                "fps": null
+            },
+            "frameworks": {
+                "sglang": {
+                    "serve_args": "--warmup-mode server --model-variant fl2va --tp-size 2 --ulysses-degree 2 --performance-mode speed --enable-torch-compile false",
+                    "extra_env": {}
+                }
+            }
         }
     ]
 }

scripts/ci/utils/diffusion/run_comparison.py

@@ -362,6 +362,16 @@ def _build_sglang_payload(case: dict) -> dict:
     ):
         if key in case:
             payload[key] = case[key]
+
+    # Model-specific request fields outside the common schema -- MiniMax-H3
+    # derives its shape from `target` and rejects an explicit num_frames, so a
+    # case needs to both add keys and drop common ones. A null value removes
+    # the key rather than sending null.
+    for key, value in (case.get("sglang_request_extra") or {}).items():
+        if value is None:
+            payload.pop(key, None)
+        else:
+            payload[key] = value
     return payload