diff --git a/open-sse/utils/noThinkingAlias.ts b/open-sse/utils/noThinkingAlias.ts
index febafc954a..9acbb2b6c8 100644
--- a/open-sse/utils/noThinkingAlias.ts
+++ b/open-sse/utils/noThinkingAlias.ts
@@ -102,22 +102,47 @@ export function shouldExposeNoThinkingAlias(model: CatalogModelEntry): boolean {
   if (spec.noThinkingAlias === false) return false;
 
   return (
-    spec.supportsThinking === true &&
-    spec.rejectsThinkingDisabled !== true &&
-    /claude/i.test(name)
+    spec.supportsThinking === true && spec.rejectsThinkingDisabled !== true && /claude/i.test(name)
   );
 }
 
+/**
+ * Normalize the provider prefix inside a qualified model id using an alias→canonical map.
+ * e.g. "cc/claude-opus-4-6" → "claude/claude-opus-4-6" when aliasToCanonical["cc"]="claude".
+ * Ids without a "/" or whose prefix is not in the map are returned unchanged.
+ */
+function normalizeProviderPrefix(
+  qualifiedId: string,
+  aliasToCanonical: Record<string, string>
+): string {
+  const slash = qualifiedId.indexOf("/");
+  if (slash < 0) return qualifiedId;
+  const prefix = qualifiedId.slice(0, slash);
+  const canonical = aliasToCanonical[prefix];
+  return canonical && canonical !== prefix
+    ? `${canonical}${qualifiedId.slice(slash)}`
+    : qualifiedId;
+}
+
 /**
  * Append a no-thinking variant for every eligible model. Returns the original array
  * reference unchanged when nothing is eligible (no allocation in the common case).
+ *
+ * @param aliasToCanonical - When provided, the inner provider prefix of each variant id is
+ *   normalized to its canonical form (e.g. "cc" → "claude"). Pass this when the catalog is
+ *   emitting canonical-prefixed ids so no-think variants stay consistent with the prefix mode.
  */
-export function appendNoThinkingVariants<T extends CatalogModelEntry>(models: T[]): T[] {
+export function appendNoThinkingVariants<T extends CatalogModelEntry>(
+  models: T[],
+  aliasToCanonical?: Record<string, string>
+): T[] {
   if (!Array.isArray(models)) return models;
   const variants: T[] = [];
   for (const model of models) {
     if (!shouldExposeNoThinkingAlias(model)) continue;
-    const aliasId = toNoThinkingAlias(model.id as string);
+    const rawId = model.id as string;
+    const qualifiedId = aliasToCanonical ? normalizeProviderPrefix(rawId, aliasToCanonical) : rawId;
+    const aliasId = toNoThinkingAlias(qualifiedId);
     const variant: T = { ...model, id: aliasId, root: aliasId };
     if (typeof model.name === "string" && model.name) {
       variant.name = `${model.name} (no thinking)`;
diff --git a/src/app/api/v1/models/catalog.ts b/src/app/api/v1/models/catalog.ts
index ae747cb384..21df30ac10 100644
--- a/src/app/api/v1/models/catalog.ts
+++ b/src/app/api/v1/models/catalog.ts
@@ -1397,7 +1397,10 @@ export async function getUnifiedModelsResponse(
 
     // Advertise no-thinking gateway variants (Fase 8.1). Derived from the already
     // key-filtered list, so a variant only appears when its real model is permitted.
-    finalModels = appendNoThinkingVariants(finalModels);
+    finalModels = appendNoThinkingVariants(
+      finalModels,
+      prefixMode === "canonical" ? aliasToProviderId : undefined
+    );
 
     // #4424 follow-up — drop exact-duplicate ids that slip through the per-source push
     // guards (e.g. `codex/gpt-5.5`, `veo-free/seedance` listed twice). Keyed by listing
diff --git a/tests/unit/no-thinking-alias.test.ts b/tests/unit/no-thinking-alias.test.ts
index eba93de349..e385698bc5 100644
--- a/tests/unit/no-thinking-alias.test.ts
+++ b/tests/unit/no-thinking-alias.test.ts
@@ -75,18 +75,29 @@ test("applyNoThinkingAlias strips reasoning fields without a thinking block (Ope
 });
 
 test("applyNoThinkingAlias is a no-op for plain models", () => {
-  const body: Record<string, unknown> = { model: "anthropic/claude-opus-4-5", thinking: { type: "enabled" } };
+  const body: Record<string, unknown> = {
+    model: "anthropic/claude-opus-4-5",
+    thinking: { type: "enabled" },
+  };
   const res = applyNoThinkingAlias(body, { claudeFormat: true });
   assert.equal(res.applied, false);
   assert.equal(body.model, "anthropic/claude-opus-4-5");
-  assert.deepEqual(body.thinking, { type: "enabled" }, "thinking is left untouched when not an alias");
+  assert.deepEqual(
+    body.thinking,
+    { type: "enabled" },
+    "thinking is left untouched when not an alias"
+  );
 });
 
 test("applyNoThinkingAlias ignores a malformed prefix-only model", () => {
   const body: Record<string, unknown> = { model: "claude-3-omniroute-no-thinking/" };
   const res = applyNoThinkingAlias(body, { claudeFormat: true });
   assert.equal(res.applied, false);
-  assert.equal(body.model, "claude-3-omniroute-no-thinking/", "left untouched when nothing follows the prefix");
+  assert.equal(
+    body.model,
+    "claude-3-omniroute-no-thinking/",
+    "left untouched when nothing follows the prefix"
+  );
 });
 
 // ── catalog gating ───────────────────────────────────────────────────────────
@@ -113,16 +124,21 @@ test("shouldExposeNoThinkingAlias rejects models where suppression is meaningles
 });
 
 test("appendNoThinkingVariants adds one variant per eligible model and preserves the rest", () => {
-  const models = [
-    entry("claude-opus-4-5"),
-    entry("gpt-4o", "openai"),
-    entry("claude-fable-5"),
-  ];
+  const models = [entry("claude-opus-4-5"), entry("gpt-4o", "openai"), entry("claude-fable-5")];
   const out = appendNoThinkingVariants(models);
   const ids = out.map((m) => m.id);
-  assert.ok(ids.includes("claude-3-omniroute-no-thinking/claude-opus-4-5"), "eligible model gets a variant");
-  assert.ok(!ids.includes("claude-3-omniroute-no-thinking/gpt-4o"), "non-thinking model has no variant");
-  assert.ok(!ids.includes("claude-3-omniroute-no-thinking/claude-fable-5"), "reject-disabled model has no variant");
+  assert.ok(
+    ids.includes("claude-3-omniroute-no-thinking/claude-opus-4-5"),
+    "eligible model gets a variant"
+  );
+  assert.ok(
+    !ids.includes("claude-3-omniroute-no-thinking/gpt-4o"),
+    "non-thinking model has no variant"
+  );
+  assert.ok(
+    !ids.includes("claude-3-omniroute-no-thinking/claude-fable-5"),
+    "reject-disabled model has no variant"
+  );
   assert.equal(out.length, models.length + 1, "exactly one variant appended");
   // originals preserved up front
   assert.deepEqual(out.slice(0, 3), models);
@@ -132,3 +148,28 @@ test("appendNoThinkingVariants returns the same array reference when nothing is
   const models = [entry("gpt-4o", "openai")];
   assert.equal(appendNoThinkingVariants(models), models);
 });
+
+test("appendNoThinkingVariants normalizes alias prefix to canonical when aliasToCanonical map is provided", () => {
+  const models = [entry("cc/claude-opus-4-5")];
+  const aliasToCanonical = { cc: "claude" };
+  const out = appendNoThinkingVariants(models, aliasToCanonical);
+  const ids = out.map((m) => m.id);
+  assert.ok(
+    ids.includes("claude-3-omniroute-no-thinking/claude/claude-opus-4-5"),
+    "uses canonical prefix"
+  );
+  assert.ok(
+    !ids.includes("claude-3-omniroute-no-thinking/cc/claude-opus-4-5"),
+    "alias prefix not used"
+  );
+});
+
+test("appendNoThinkingVariants keeps alias prefix when no map is provided", () => {
+  const models = [entry("cc/claude-opus-4-5")];
+  const out = appendNoThinkingVariants(models);
+  const ids = out.map((m) => m.id);
+  assert.ok(
+    ids.includes("claude-3-omniroute-no-thinking/cc/claude-opus-4-5"),
+    "alias prefix preserved"
+  );
+});