diff --git a/computility-run.yaml b/computility-run.yaml
index 451d201d..92dd03b0 100644
--- a/computility-run.yaml
+++ b/computility-run.yaml
@@ -34,6 +34,8 @@ command:
 env:
     - name: VLLM_ENGINE_ITERATION_TIMEOUT_S
       value: '3600'
+    - name: BI100_MAX_NUM_SEQS
+      value: '2'
     # --- MoE kernel selection ---
     - name: BI100_MOE_COREX_DIRECT_ROUTED
       value: '1'
diff --git a/qwen3_6_scripts/multimodal_utils.py b/qwen3_6_scripts/multimodal_utils.py
index 75ed8f5c..9e391113 100644
--- a/qwen3_6_scripts/multimodal_utils.py
+++ b/qwen3_6_scripts/multimodal_utils.py
@@ -59,8 +59,19 @@ async def async_fetch_image(image_url: str,
     By default, the image is converted into RGB format.
     """
     if image_url.startswith('http'):
-        image_raw = await global_http_connection.async_get_bytes(
-            image_url, timeout=VLLM_IMAGE_FETCH_TIMEOUT)
+        # [BI100] Retry with increasing timeout for container network issues
+        _last_exc = None
+        for _attempt in range(3):
+            try:
+                _timeout = VLLM_IMAGE_FETCH_TIMEOUT * (_attempt + 1)
+                image_raw = await global_http_connection.async_get_bytes(
+                    image_url, timeout=_timeout)
+                _last_exc = None
+                break
+            except Exception as _e:
+                _last_exc = _e
+        if _last_exc is not None:
+            raise _last_exc
         image = _load_image_from_bytes(image_raw)
 
     elif image_url.startswith('data:image'):
diff --git a/qwen3_6_scripts/patch_ops.sh b/qwen3_6_scripts/patch_ops.sh
index d97191e3..8be4f064 100755
--- a/qwen3_6_scripts/patch_ops.sh
+++ b/qwen3_6_scripts/patch_ops.sh
@@ -523,6 +523,153 @@ fi
 build_stage "compiling submission Python sources"
 find . -path './wheels' -prune -o -name '*.py' -print0 | xargs -0 python3 -m py_compile
 
+# =====================================================================
+# FIX 1: Clear .pyc cache — prevents stale base-image protocol.py from
+#        shadowing our patched version (root cause of 221× max_completion_tokens
+#        extra_forbidden 400 errors in sub791).
+# =====================================================================
+build_stage "clearing .pyc caches"
+find "${VLLM_ROOT}" -name '*.pyc' -delete 2>/dev/null || true
+find "${VLLM_ROOT}" -name '__pycache__' -type d -exec rm -rf {} + 2>/dev/null || true
+echo "[patch_ops] cleared all .pyc under ${VLLM_ROOT}"
+
+# =====================================================================
+# FIX 2: Allow greedy sampling with n>1 — fixes t2_n_2 functional test.
+#        vLLM rejects n=2+temperature=0 in SamplingParams._verify_greedy_sampling.
+#        For greedy, n identical copies are deterministic; allow it and let
+#        serving_chat.py's sequential fanout handle the duplication.
+# =====================================================================
+build_stage "patching SamplingParams to allow greedy n>1"
+SAMPLING_PY="${VLLM_ROOT}/sampling_params.py"
+if [ -f "$SAMPLING_PY" ]; then
+    python3 - "$SAMPLING_PY" << 'FIXPY'
+import sys, re
+path = sys.argv[1]
+src = open(path).read()
+# Replace the _verify_greedy_sampling body: allow n>1 silently
+old = '''    def _verify_greedy_sampling(self) -> None:
+        if self.n > 1:
+            raise ValueError("n must be 1 when using greedy sampling, "
+                             f"got {self.n}.")'''
+new = '''    def _verify_greedy_sampling(self) -> None:
+        # [BI100] Allow n>1 with greedy: results are deterministic duplicates.
+        pass'''
+if old in src:
+    src = src.replace(old, new)
+    open(path, 'w').write(src)
+    print(f"[patch_ops] SamplingParams: greedy n>1 allowed")
+else:
+    print(f"[patch_ops] SamplingParams: pattern not found, trying regex")
+    src2 = re.sub(
+        r'(def _verify_greedy_sampling\(self\)[^:]*:)\s*\n\s*if self\.n > 1:\s*\n\s*raise ValueError\([^)]+\)',
+        r'\1\n        # [BI100] Allow n>1 with greedy.\n        pass',
+        src)
+    if src2 != src:
+        open(path, 'w').write(src2)
+        print(f"[patch_ops] SamplingParams: greedy n>1 allowed (regex)")
+    else:
+        print(f"[WARN] SamplingParams: could not patch _verify_greedy_sampling")
+FIXPY
+fi
+
+# Also fix serving_chat.py fanout: remove max_num_seqs==1 restriction
+build_stage "patching serving_chat.py fanout for n=2"
+SERVING_CHAT="${VLLM_ROOT}/entrypoints/openai/serving_chat.py"
+if [ -f "$SERVING_CHAT" ]; then
+    python3 - "$SERVING_CHAT" << 'FIXPY'
+import sys
+path = sys.argv[1]
+src = open(path).read()
+# Widen fanout: drop the max_num_seqs == 1 restriction so n=2 works
+# regardless of the platform's max_num_seqs setting
+old = "        max_num_seqs == 1\n        and n == 2"
+new = "        n == 2  # [BI100] allow fanout regardless of max_num_seqs"
+if old in src:
+    src = src.replace(old, new)
+    open(path, 'w').write(src)
+    print("[patch_ops] serving_chat: fanout max_num_seqs restriction removed")
+else:
+    print("[WARN] serving_chat: fanout pattern not found")
+FIXPY
+fi
+
+# =====================================================================
+# FIX 3: Ensure max_num_seqs >= 2 at runtime — allows n=2 via native
+#        vLLM path when platform sets max_num_seqs=1.
+#        Read BI100_MAX_NUM_SEQS env to override command-line value.
+# =====================================================================
+build_stage "patching SchedulerConfig for max_num_seqs override"
+CONFIG_PY="${VLLM_ROOT}/config.py"
+if [ -f "$CONFIG_PY" ]; then
+    python3 - "$CONFIG_PY" << 'FIXPY'
+import sys
+path = sys.argv[1]
+src = open(path).read()
+marker = "# [BI100] max_num_seqs env override"
+if marker in src:
+    print("[patch_ops] config.py: max_num_seqs override already patched")
+else:
+    old = "        self.max_num_seqs = max_num_seqs"
+    new = """        self.max_num_seqs = max_num_seqs
+        # [BI100] max_num_seqs env override
+        import os as _os
+        _mns_override = _os.environ.get("BI100_MAX_NUM_SEQS")
+        if _mns_override is not None:
+            self.max_num_seqs = max(int(_mns_override), self.max_num_seqs)"""
+    if old in src:
+        src = src.replace(old, new, 1)
+        open(path, 'w').write(src)
+        print(f"[patch_ops] config.py: max_num_seqs env override patched")
+    else:
+        print(f"[WARN] config.py: max_num_seqs assignment not found")
+FIXPY
+fi
+
+# =====================================================================
+# FIX 4: Multimodal image fetch — increase timeout and add retry for
+#        remote images to fix t13_multimodal_base64 (HTTP timeout in
+#        Docker container network).
+# =====================================================================
+build_stage "patching multimodal image fetch timeout"
+MM_UTILS="${VLLM_ROOT}/multimodal/utils.py"
+if [ -f "$MM_UTILS" ]; then
+    python3 - "$MM_UTILS" << 'FIXPY'
+import sys
+path = sys.argv[1]
+src = open(path).read()
+# Increase timeout and add retry
+old = """    if image_url.startswith('http'):
+        image_raw = await global_http_connection.async_get_bytes(
+            image_url, timeout=VLLM_IMAGE_FETCH_TIMEOUT)
+        image = _load_image_from_bytes(image_raw)"""
+new = """    if image_url.startswith('http'):
+        # [BI100] Retry with increasing timeout for container network issues
+        _last_exc = None
+        for _attempt in range(3):
+            try:
+                _timeout = VLLM_IMAGE_FETCH_TIMEOUT * (_attempt + 1)
+                image_raw = await global_http_connection.async_get_bytes(
+                    image_url, timeout=_timeout)
+                _last_exc = None
+                break
+            except Exception as _e:
+                _last_exc = _e
+        if _last_exc is not None:
+            raise _last_exc
+        image = _load_image_from_bytes(image_raw)"""
+if old in src:
+    src = src.replace(old, new)
+    open(path, 'w').write(src)
+    print("[patch_ops] multimodal: image fetch retry patched")
+else:
+    print("[WARN] multimodal: image fetch pattern not found")
+FIXPY
+fi
+
+# Clear .pyc again after all patches
+find "${VLLM_ROOT}" -name '*.pyc' -delete 2>/dev/null || true
+find "${VLLM_ROOT}" -name '__pycache__' -type d -exec rm -rf {} + 2>/dev/null || true
+
 build_stage "verifying dlopen chain"
 python3 ./verify_dlopen_chain.py --vllm-root "${VLLM_ROOT}" || {
     echo "[WARN] dlopen chain verification found issues (non-fatal)"
diff --git a/qwen3_6_scripts/serving_chat.py b/qwen3_6_scripts/serving_chat.py
index dd39d36a..8b5ceeab 100644
--- a/qwen3_6_scripts/serving_chat.py
+++ b/qwen3_6_scripts/serving_chat.py
@@ -121,8 +121,7 @@ def _sequential_greedy_fanout_count(
     """Return the supported deterministic fan-out width, or zero."""
     n = request.n if request.n is not None else 1
     if (
-        max_num_seqs == 1
-        and n == 2
+        n == 2  # [BI100] allow fanout regardless of max_num_seqs
         and request.temperature == 0
         and not request.stream
         and not request.use_beam_search
@@ -1358,4 +1357,4 @@ class OpenAIServingChat(OpenAIServing):
             and delta_message.tool_calls and delta_message.tool_calls[0]
             and delta_message.tool_calls[0].function
             and delta_message.tool_calls[0].function.arguments is not None
-        )
+        )
\ No newline at end of file
diff --git a/qwen3_6_scripts/vendor_overrides/vllm/sampling_params.py b/qwen3_6_scripts/vendor_overrides/vllm/sampling_params.py
index 58790be1..9ec90e2c 100644
--- a/qwen3_6_scripts/vendor_overrides/vllm/sampling_params.py
+++ b/qwen3_6_scripts/vendor_overrides/vllm/sampling_params.py
@@ -423,9 +423,8 @@ class SamplingParams(
             raise ValueError("best_of must equal n to use output_kind=DELTA")
 
     def _verify_greedy_sampling(self) -> None:
-        if self.n > 1:
-            raise ValueError("n must be 1 when using greedy sampling, "
-                             f"got {self.n}.")
+        # [BI100] Allow n>1 with greedy: results are deterministic duplicates.
+        pass
 
     def update_from_generation_config(
             self,
@@ -517,4 +516,4 @@ class BeamSearchParams(
     max_tokens: int
     ignore_eos: bool = False
     temperature: float = 0.0
-    length_penalty: float = 1.0
+    length_penalty: float = 1.0
\ No newline at end of file