From 5f05f46c7cfd541d15c46f8236113472b35dd4e7 Mon Sep 17 00:00:00 2001
From: Abiba <abiba@sysloggh.com>
Date: Tue, 19 May 2026 18:27:24 +0000
Subject: [PATCH] =?UTF-8?q?fix:=20heavy=20tier=20=E2=80=94=20Dense=20first?=
 =?UTF-8?q?=20for=20reasoning,=20MoE=20workhorse,=20VLM=20overflow?=
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---
 router/router.py | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/router/router.py b/router/router.py
index f82d968..e0a1b1d 100644
--- a/router/router.py
+++ b/router/router.py
@@ -119,7 +119,11 @@ def is_gpu_busy(model):
     return active >= max_c
 
 def select_best_gpu(candidates, reason):
-    """Pick the best GPU from candidates, preferring least-loaded."""
+    """Pick the best GPU from candidates IN ORDER — first non-busy one wins."""
+    for m in candidates:
+        if not is_gpu_busy(m):
+            return {"model": m, "reason": reason}
+    # All busy — pick least loaded
     best = None
     best_load = 999
     for m in candidates:
@@ -128,10 +132,7 @@ def select_best_gpu(candidates, reason):
             best_load = load
             best = m
     if best:
-        actual_reason = reason
-        if is_gpu_busy(best):
-            actual_reason = "load_balanced_" + reason
-        return {"model": best, "reason": actual_reason}
+        return {"model": best, "reason": "load_balanced_" + reason}
     return None
 
 def route(rd, tier):
@@ -182,7 +183,7 @@ def route(rd, tier):
     
     # TIER 3: Heavy reasoning — large context or very long conversations
     if t > 4000 or turns > 8:
-        candidates = [m for m in ["qwen3.6-35B-A3B","qwen3.5-9b-vlm","qwen3.6-27B-code"] if m in avail]
+        candidates = [m for m in ["qwen3.6-27B-code","qwen3.6-35B-A3B","qwen3.5-9b-vlm"] if m in avail]
         result = select_best_gpu(candidates, "heavy_reasoning")
         if result: return result