diff --git a/src/app/(dashboard)/dashboard/settings/components/ResilienceTab.tsx b/src/app/(dashboard)/dashboard/settings/components/ResilienceTab.tsx
index 0bbbc80b9d..06a493803a 100644
--- a/src/app/(dashboard)/dashboard/settings/components/ResilienceTab.tsx
+++ b/src/app/(dashboard)/dashboard/settings/components/ResilienceTab.tsx
@@ -347,7 +347,7 @@ function ConnectionCooldownCard({
         {editing ? (
           <>
             <NumberField
-              label="Cooldown base"
+              label="Base cooldown"
               value={current.baseCooldownMs}
               min={0}
               suffix="ms"
@@ -356,7 +356,7 @@ function ConnectionCooldownCard({
               }
             />
             <BooleanField
-              label="Usar dicas de retry do upstream"
+              label="Use upstream retry hints"
               description="Usa valores de retry-after/reset do upstream quando disponíveis."
               checked={current.useUpstreamRetryHints}
               onChange={(useUpstreamRetryHints) =>
@@ -409,7 +409,7 @@ function ConnectionCooldownCard({
               </p>
             </div>
             <NumberField
-              label="Máximo de passos de backoff"
+              label="Max backoff steps"
               value={current.maxBackoffSteps}
               min={0}
               onChange={(maxBackoffSteps) =>
@@ -420,11 +420,11 @@ function ConnectionCooldownCard({
         ) : (
           <>
             <div className="flex items-center justify-between text-sm">
-              <span className="text-text-muted">Cooldown base</span>
+              <span className="text-text-muted">Base cooldown</span>
               <span className="font-mono text-text-main">{formatMs(current.baseCooldownMs)}</span>
             </div>
             <div className="flex items-center justify-between text-sm">
-              <span className="text-text-muted">Usar dicas de retry do upstream</span>
+              <span className="text-text-muted">Use upstream retry hints</span>
               <span className="font-mono text-text-main">
                 {current.useUpstreamRetryHints ? "Sim" : "Não"}
               </span>
@@ -440,7 +440,7 @@ function ConnectionCooldownCard({
               </span>
             </div>
             <div className="flex items-center justify-between text-sm">
-              <span className="text-text-muted">Máximo de passos de backoff</span>
+              <span className="text-text-muted">Max backoff steps</span>
               <span className="font-mono text-text-main">{current.maxBackoffSteps}</span>
             </div>
           </>
@@ -455,7 +455,7 @@ function ConnectionCooldownCard({
         <div className="space-y-2">
           <div className="flex items-center gap-2">
             <span className="material-symbols-outlined text-xl text-primary">timer_off</span>
-            <h2 className="text-lg font-bold">Cooldown de Conexão</h2>
+            <h2 className="text-lg font-bold">Connection Cooldown</h2>
           </div>
           <SectionDescription
             scope="Conexão individual"
diff --git a/src/lib/modelCapabilities.ts b/src/lib/modelCapabilities.ts
index 90612b19f0..07fec2152e 100644
--- a/src/lib/modelCapabilities.ts
+++ b/src/lib/modelCapabilities.ts
@@ -218,18 +218,20 @@ export function getResolvedModelCapabilities(input: CapabilityInput): ResolvedMo
         ? `${resolved.provider}/${resolved.model}`
         : resolved.model || resolved.rawModel || resolved.lookupKey
     ) || "";
+  const reasoningDenied = !heuristicReasoning(lookupKey);
 
   const supportsTools =
     synced?.tool_call ??
     (typeof registryModel?.toolCalling === "boolean" ? registryModel.toolCalling : null) ??
     (typeof spec?.supportsTools === "boolean" ? spec.supportsTools : null);
 
-  const supportsThinking =
-    synced?.reasoning ??
-    (typeof registryModel?.supportsReasoning === "boolean"
-      ? registryModel.supportsReasoning
-      : null) ??
-    (typeof spec?.supportsThinking === "boolean" ? spec.supportsThinking : null);
+  const supportsThinking = reasoningDenied
+    ? false
+    : (synced?.reasoning ??
+      (typeof registryModel?.supportsReasoning === "boolean"
+        ? registryModel.supportsReasoning
+        : null) ??
+      (typeof spec?.supportsThinking === "boolean" ? spec.supportsThinking : null));
 
   const contextWindow =
     synced?.limit_context ??
diff --git a/tests/unit/translator-helper-branches.test.ts b/tests/unit/translator-helper-branches.test.ts
index 9f80646b07..ec9832b62a 100644
--- a/tests/unit/translator-helper-branches.test.ts
+++ b/tests/unit/translator-helper-branches.test.ts
@@ -6,6 +6,8 @@ const openaiHelper = await import("../../open-sse/translator/helpers/openaiHelpe
 const claudeHelper = await import("../../open-sse/translator/helpers/claudeHelper.ts");
 const geminiHelper = await import("../../open-sse/translator/helpers/geminiHelper.ts");
 const toolCallHelper = await import("../../open-sse/translator/helpers/toolCallHelper.ts");
+const { DEFAULT_THINKING_CLAUDE_SIGNATURE } =
+  await import("../../open-sse/config/defaultThinkingSignature.ts");
 
 const originalMathRandom = Math.random;
 
@@ -308,7 +310,8 @@ test("claudeHelper validates content, ordering and request preparation branches"
     prepared.messages[5].content.map((block) => block.type),
     ["redacted_thinking", "text"]
   );
-  assert.ok(prepared.messages[5].content[0].signature);
+  assert.equal(prepared.messages[5].content[0].data, DEFAULT_THINKING_CLAUDE_SIGNATURE);
+  assert.equal(prepared.messages[5].content[0].signature, undefined);
   assert.equal(prepared.messages[5].content[0].thinking, undefined);
   assert.equal(prepared.tools.length, 2);
   assert.equal(prepared.tools[0].cache_control, undefined);