diff --git a/changelog.d/fixes/11861-nous-hermes-405b-label.md b/changelog.d/fixes/11861-nous-hermes-405b-label.md
new file mode 100644
index 0000000000..c34eb40120
--- /dev/null
+++ b/changelog.d/fixes/11861-nous-hermes-405b-label.md
@@ -0,0 +1 @@
+- **fix(config):** Nous Research's `Hermes-4-405B` model now displays as "Hermes 4 405B (Nous Research)" in both the provider registry and the free-model catalog, instead of the mislabelled "Hermes 4 7B" ([#11861](https://github.com/diegosouzapw/OmniRoute/issues/11861)) — thanks @Karan825
diff --git a/open-sse/config/freeModelCatalog.data.ts b/open-sse/config/freeModelCatalog.data.ts
index 1403e27f06..163b82bc84 100644
--- a/open-sse/config/freeModelCatalog.data.ts
+++ b/open-sse/config/freeModelCatalog.data.ts
@@ -268,7 +268,7 @@ export const FREE_MODEL_BUDGETS: FreeModelBudget[] = [
   { provider: "muse-spark-web", modelId: "muse-spark-contemplating", displayName: "Muse Spark Contemplating", monthlyTokens: 0, creditTokens: 0, freeType: "keyless", poolKey: "muse-spark-web", tos: "avoid" },
   { provider: "nebius", modelId: "meta-llama/Llama-3.3-70B-Instruct", displayName: "Llama 3.3 70B Instruct", monthlyTokens: 0, creditTokens: 1000000, freeType: "one-time-initial", poolKey: "nebius", tos: "caution" },
   { provider: "nlpcloud", modelId: "llama-3-8b-instruct", displayName: "Llama 3 8B", monthlyTokens: 0, creditTokens: 0, freeType: "recurring-monthly", poolKey: "nlpcloud", tos: "avoid" },
-  { provider: "nous-research", modelId: "Hermes-4-405B", displayName: "Hermes 4 7B (Nous Research)", monthlyTokens: 0, creditTokens: 0, freeType: "recurring-credit", poolKey: "nous-research", tos: "ambiguous" },
+  { provider: "nous-research", modelId: "Hermes-4-405B", displayName: "Hermes 4 405B (Nous Research)", monthlyTokens: 0, creditTokens: 0, freeType: "recurring-credit", poolKey: "nous-research", tos: "ambiguous" },
   { provider: "nous-research", modelId: "Hermes-4-70B", displayName: "Hermes 4 70B (Nous Research)", monthlyTokens: 0, creditTokens: 0, freeType: "recurring-credit", poolKey: "nous-research", tos: "ambiguous" },
   { provider: "novita", modelId: "ai-ai/llama-3.1-8b-instruct", displayName: "Llama 3.1 8B", monthlyTokens: 0, creditTokens: 500000, freeType: "one-time-initial", poolKey: "novita", tos: "caution" },
   { provider: "nscale", modelId: "moonshotai/Kimi-K2.5", displayName: "moonshotai/Kimi-K2.5", monthlyTokens: 0, creditTokens: 5000000, freeType: "one-time-initial", poolKey: "nscale", tos: "caution" },
diff --git a/open-sse/config/providers/registry/nous-research/index.ts b/open-sse/config/providers/registry/nous-research/index.ts
index aaa61ac5ac..e118dbcae7 100644
--- a/open-sse/config/providers/registry/nous-research/index.ts
+++ b/open-sse/config/providers/registry/nous-research/index.ts
@@ -9,7 +9,7 @@ export const nous_researchProvider: RegistryEntry = {
   authType: "apikey",
   authHeader: "bearer",
   models: [
-    { id: "Hermes-4-405B", name: "Hermes 4 7B (Nous Research)" },
+    { id: "Hermes-4-405B", name: "Hermes 4 405B (Nous Research)" },
     { id: "Hermes-4-70B", name: "Hermes 4 70B (Nous Research)" },
   ],
 };
diff --git a/tests/unit/nous-research-model-labels-11861.test.ts b/tests/unit/nous-research-model-labels-11861.test.ts
new file mode 100644
index 0000000000..61751682db
--- /dev/null
+++ b/tests/unit/nous-research-model-labels-11861.test.ts
@@ -0,0 +1,67 @@
+/**
+ * Regression test for #11861 — Nous Research registry mislabels Hermes-4-405B as "7B"
+ *
+ * `open-sse/config/providers/registry/nous-research/index.ts` displayed the 405B-parameter
+ * model with the copy-pasted name "Hermes 4 7B (Nous Research)". The `id` and `name` fields
+ * must agree on the model's parameter size for every model this provider ships.
+ */
+import test from "node:test";
+import assert from "node:assert/strict";
+
+import { REGISTRY as providerRegistry } from "../../open-sse/config/providerRegistry.ts";
+import { FREE_MODEL_BUDGETS } from "../../open-sse/config/freeModelCatalog.ts";
+
+/** Extracts a parameter-size token like "405B" or "70B" from a string, if present. */
+function extractParamSize(value: string): string | null {
+  const match = value.match(/(\d+(?:\.\d+)?[BM])\b/i);
+  return match ? match[1].toUpperCase() : null;
+}
+
+test("nous-research model display names match their id's parameter size", () => {
+  const entry = providerRegistry["nous-research"];
+  assert.ok(entry, "providerRegistry['nous-research'] must be defined");
+  assert.ok(entry.models.length > 0, "nous-research must ship at least one model");
+
+  for (const model of entry.models) {
+    const idSize = extractParamSize(model.id);
+    assert.ok(idSize, `nous-research model id "${model.id}" must encode a parameter size`);
+
+    const nameSize = extractParamSize(model.name);
+    assert.ok(
+      nameSize,
+      `nous-research model "${model.id}" display name "${model.name}" must encode a parameter size`
+    );
+
+    assert.equal(
+      nameSize,
+      idSize,
+      `nous-research model "${model.id}" display name "${model.name}" advertises ${nameSize} ` +
+        `but the id says ${idSize}`
+    );
+  }
+});
+
+test("nous-research Hermes-4-405B is labelled 405B (Nous Research)", () => {
+  const entry = providerRegistry["nous-research"];
+  const model = entry.models.find((m) => m.id === "Hermes-4-405B");
+  assert.ok(model, "Hermes-4-405B must be registered");
+  assert.equal(model.name, "Hermes 4 405B (Nous Research)");
+});
+
+test("nous-research free-model catalog display names match their modelId's parameter size", () => {
+  const rows = FREE_MODEL_BUDGETS.filter((model) => model.provider === "nous-research");
+  assert.ok(rows.length > 0, "FREE_MODEL_BUDGETS must list nous-research models");
+
+  for (const row of rows) {
+    const idSize = extractParamSize(row.modelId);
+    assert.ok(idSize, `nous-research free-catalog modelId "${row.modelId}" must encode a size`);
+
+    const nameSize = extractParamSize(row.displayName);
+    assert.equal(
+      nameSize,
+      idSize,
+      `nous-research free-catalog "${row.modelId}" displayName "${row.displayName}" advertises ` +
+        `${nameSize} but the modelId says ${idSize}`
+    );
+  }
+});