diff --git a/src/app/(dashboard)/dashboard/models/page.js b/src/app/(dashboard)/dashboard/models/page.js
index 4fd87b7f..0a420134 100644
--- a/src/app/(dashboard)/dashboard/models/page.js
+++ b/src/app/(dashboard)/dashboard/models/page.js
@@ -21,8 +21,14 @@ function groupModelsByProvider(models) {
       groups[key] = {
         provider: model.provider,
         models: [],
+        modelIds: new Set(),
       };
     }
+
+    // The API normally supplies unique models. Ignore a duplicate defensively
+    // so a malformed response cannot produce duplicate React keys.
+    if (groups[key].modelIds.has(model.fullModel)) return groups;
+    groups[key].modelIds.add(model.fullModel);
     groups[key].models.push(model);
     return groups;
   }, {});
diff --git a/src/shared/constants/models.js b/src/shared/constants/models.js
index 297daae7..8f99a2b6 100644
--- a/src/shared/constants/models.js
+++ b/src/shared/constants/models.js
@@ -32,9 +32,20 @@ export function isValidModel(aliasOrId, modelId) {
   return models.some(m => m.id === modelId);
 }
 
-// Legacy AI_MODELS for backward compatibility
+// Legacy AI_MODELS for backward compatibility. A model can be declared under
+// multiple service kinds (for example, Gemini chat and speech-to-text), but
+// this flat catalog has no kind field. Keep its provider/model identity unique.
+const seenModelIds = new Set();
+
 export const AI_MODELS = Object.entries(MODELS).flatMap(([alias, models]) =>
-  models.map(m => ({ provider: alias, model: m.id, name: m.name }))
+  models
+    .filter((model) => {
+      const modelKey = `${alias}/${model.id}`;
+      if (seenModelIds.has(modelKey)) return false;
+      seenModelIds.add(modelKey);
+      return true;
+    })
+    .map((model) => ({ provider: alias, model: model.id, name: model.name }))
 );
 
 export const getModelKind = (m, fallback = null) => m?.kind || m?.type || fallback;