From 57e14cf3a69e5106a0a29ffda77f8aa134aa435d Mon Sep 17 00:00:00 2001
From: Tam Nhu Tran <kaitran.ntt@gmail.com>
Date: Mon, 23 Feb 2026 22:59:02 +0700
Subject: [PATCH] fix(codex): validate tier thinking values before suffixing

---
 src/cliproxy/config/thinking-config.ts | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/cliproxy/config/thinking-config.ts b/src/cliproxy/config/thinking-config.ts
index 76e67752..bf0dfa99 100644
--- a/src/cliproxy/config/thinking-config.ts
+++ b/src/cliproxy/config/thinking-config.ts
@@ -294,6 +294,16 @@ export function applyThinkingConfig(
         continue;
       }
 
+      // Validate/clamp tier thinking against this specific tier model capabilities.
+      const tierValidation = validateThinking(tierProvider, normalizedTierModel, tierThinkingValue);
+      if (tierValidation.warning && shouldShowWarnings(thinkingConfig)) {
+        console.warn(warn(tierValidation.warning));
+      }
+      tierThinkingValue = tierValidation.value;
+      if (isThinkingOffValue(tierThinkingValue)) {
+        continue;
+      }
+
       result[tierVar] = applyThinkingSuffixForProvider(model, tierThinkingValue, tierProvider);
     }
   }