From 9dc23c7e3ae489b2e94a20e5b07e920aa68f036a Mon Sep 17 00:00:00 2001
From: Mihidum Hettiyahandi <55163074+mihidumh@users.noreply.github.com>
Date: Wed, 15 Jul 2026 09:32:05 +1000
Subject: [PATCH] fix(router): use consistent positive checks in azure
 base_model fallback gate
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Review follow-up: token-limit fields used 'is not None' while the cost
field used '> 0' — a cost-map entry explicitly storing 0 limits could
suppress the error log without carrying usable resolution data. All
three checks now require a positive value.
---
 litellm/router.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/litellm/router.py b/litellm/router.py
index 67a16c16885..6d7a388fc20 100644
--- a/litellm/router.py
+++ b/litellm/router.py
@@ -8535,8 +8535,8 @@ class Router:
             _azure_fallback_key = _model if _model.startswith("azure/") else "azure/{}".format(_model)
             _fallback_entry = litellm.model_cost.get(_azure_fallback_key) or {}
             _fallback_resolves = (
-                _fallback_entry.get("max_input_tokens") is not None
-                or _fallback_entry.get("max_tokens") is not None
+                (_fallback_entry.get("max_input_tokens") or 0) > 0
+                or (_fallback_entry.get("max_tokens") or 0) > 0
                 or (_fallback_entry.get("input_cost_per_token") or 0) > 0
             )
             if _fallback_resolves: