diff --git a/apps/web/src/settings/myra-model-redeploy.test.ts b/apps/web/src/settings/myra-model-redeploy.test.ts
index 0d8c9788b..c8cefa917 100644
--- a/apps/web/src/settings/myra-model-redeploy.test.ts
+++ b/apps/web/src/settings/myra-model-redeploy.test.ts
@@ -45,6 +45,33 @@ describe("swapDeclaredOffering", () => {
     expect(result?.sourceOfferingIds).toEqual(["off_new", "off_b", "off_c"]);
   });
 
+  test("drops the duplicate when the new offering is already declared", () => {
+    // The new offering is minted before the current list is read, so the
+    // swap would otherwise declare it twice and the hub rejects that.
+    const before = {
+      sourceOfferingIds: ["off_old", "off_new"],
+      defaultSourceOfferingId: "off_old",
+      declaredSources: [
+        { provider: "openai-compatible" as const, model: "qwen2.5:7b" },
+        { provider: "openai-compatible" as const, model: "llama3.2:1b" },
+      ],
+    };
+
+    const result = swapDeclaredOffering(
+      before,
+      "off_old",
+      "off_new",
+      "openai-compatible",
+      "llama3.2:1b",
+    );
+
+    expect(result).toEqual({
+      sourceOfferingIds: ["off_new"],
+      defaultSourceOfferingId: "off_new",
+      declaredSources: [{ provider: "openai-compatible", model: "llama3.2:1b" }],
+    });
+  });
+
   test("returns null when the old offering id isn't declared at all", () => {
     const result = swapDeclaredOffering(
       BEFORE,
diff --git a/apps/web/src/settings/myra-model-redeploy.ts b/apps/web/src/settings/myra-model-redeploy.ts
index 9d47e65e9..c6b223135 100644
--- a/apps/web/src/settings/myra-model-redeploy.ts
+++ b/apps/web/src/settings/myra-model-redeploy.ts
@@ -67,16 +67,23 @@ export function swapDeclaredOffering(
 } | null {
   const index = before.sourceOfferingIds.indexOf(oldOfferingId);
   if (index === -1) return null;
+  const swappedIds = before.sourceOfferingIds.map((id) =>
+    id === oldOfferingId ? newOfferingId : id,
+  );
+  const swappedSources = before.declaredSources.map((source, position) =>
+    position === index ? { provider, model: newCanonicalName } : source,
+  );
+  // The new offering is minted before the current list is read, so it can
+  // already be present; the hub rejects a chain that names an id twice.
+  const firstSeen = (id: string, position: number) => swappedIds.indexOf(id) === position;
   return {
-    sourceOfferingIds: before.sourceOfferingIds.map((id) =>
-      id === oldOfferingId ? newOfferingId : id,
-    ),
+    sourceOfferingIds: swappedIds.filter(firstSeen),
     defaultSourceOfferingId:
       before.defaultSourceOfferingId === oldOfferingId
         ? newOfferingId
         : before.defaultSourceOfferingId,
-    declaredSources: before.declaredSources.map((source, position) =>
-      position === index ? { provider, model: newCanonicalName } : source,
+    declaredSources: swappedSources.filter((_, position) =>
+      firstSeen(swappedIds[position] ?? "", position),
     ),
   };
 }