fix(vercel): factor free routes onto base models (#5077)

Co-authored-by: rekram1-node <rekram1-node@users.noreply.github.com>

models/zhipuai/glm-4.6v-flash.toml

@@ -0,0 +1,25 @@
+# Sources (accessed 2026-08-19):
+# - https://z.ai/blog/glm-4.6v
+# - https://huggingface.co/zai-org/GLM-4.6V-Flash
+name = "GLM-4.6V-Flash"
+description = "Lightweight GLM vision model for visual reasoning, documents, and multimodal agents"
+family = "glm"
+release_date = "2025-12-08"
+last_updated = "2025-12-08"
+attachment = true
+reasoning = true
+temperature = true
+tool_call = true
+open_weights = true
+
+[limit]
+context = 128_000
+output = 32_768
+
+[modalities]
+input = ["text", "image", "video"]
+output = ["text"]
+
+[[weights]]
+label = "Hugging Face"
+url = "https://huggingface.co/zai-org/GLM-4.6V-Flash"

packages/core/src/sync/providers/vercel.ts

@@ -70,13 +70,15 @@ export const vercel = {
   },
   translateModel(model, context) {
     const existing = context.existing(model.id);
-    const baseModel = existing?.base_model ?? resolveCanonicalBaseModel(model.id);
+    const routeBase = freeRouteBase(model.id);
+    const baseModel = existing?.base_model ?? resolveVercelBaseModel(model.id);
+    const inherited = routeBase === undefined ? undefined : context.existing(routeBase);
     return {
       id: model.id,
       model: buildVercelModel(
         model,
         existing,
-        baseModel === undefined || baseModel === model.id ? undefined : context.existing(baseModel),
+        inherited ?? (baseModel === undefined || baseModel === model.id ? undefined : context.existing(baseModel)),
       ),
     };
   },
@@ -178,7 +180,7 @@ export function buildVercelModel(
     },
   };
 
-  const baseModel = existing?.base_model ?? resolveCanonicalBaseModel(model.id);
+  const baseModel = existing?.base_model ?? resolveVercelBaseModel(model.id);
   if (baseModel === undefined) return synced;
 
   return factorBaseModel(baseModel, {
@@ -199,6 +201,16 @@ export function buildVercelModel(
   }, synced.limit, existing?.base_model_omit);
 }
 
+function resolveVercelBaseModel(modelID: string) {
+  const routeBase = freeRouteBase(modelID);
+  return resolveCanonicalBaseModel(modelID)
+    ?? (routeBase === undefined ? undefined : resolveCanonicalBaseModel(routeBase));
+}
+
+function freeRouteBase(modelID: string) {
+  return modelID.endsWith("-free") ? modelID.slice(0, -"-free".length) : undefined;
+}
+
 function dateFromTimestamp(timestamp: number) {
   return new Date(timestamp * 1000).toISOString().slice(0, 10);
 }

packages/core/test/sync.test.ts

@@ -3541,6 +3541,44 @@ test("Vercel factored models inherit temperature from base metadata", () => {
   expect(synced).not.toHaveProperty("temperature");
 });
 
+test("Vercel free routes factor onto the canonical non-free model", () => {
+  const [model] = vercel.parseModels({
+    data: [{
+      id: "zai/glm-4.6v-flash-free",
+      name: "GLM-4.6V-Flash (Free)",
+      created: 1_765_152_000,
+      released: 1_765_152_000,
+      context_window: 128_000,
+      max_tokens: 24_000,
+      type: "language",
+      tags: ["reasoning", "tool-use", "vision", "file-input"],
+      pricing: { input: "0", output: "0" },
+    }],
+  });
+
+  const translated = vercel.translateModel(model!, {
+    existing(id) {
+      return id === "zai/glm-4.6v-flash"
+        ? { reasoning_options: [{ type: "toggle" }] }
+        : undefined;
+    },
+    authored() {
+      return undefined;
+    },
+  });
+
+  expect(translated?.model).toMatchObject({
+    base_model: "zhipuai/glm-4.6v-flash",
+    name: "GLM-4.6V-Flash (Free)",
+    reasoning_options: [{ type: "toggle" }],
+    cost: { input: 0, output: 0 },
+    limit: { output: 24_000 },
+    modalities: { input: ["text", "image", "pdf"] },
+  });
+  expect(translated?.model).not.toHaveProperty("description");
+  expect(translated?.model).not.toHaveProperty("family");
+});
+
 test("Vercel Claude Opus fast variants factor onto base opus metadata", () => {
   const [model] = vercel.parseModels({
     data: [{

providers/vercel/models/zai/glm-4.6v-flash.toml

@@ -1,20 +1,8 @@
-name = "GLM-4.6V-Flash"
-description = "GLM vision model for visual reasoning, documents, and multimodal agents"
-family = "glm"
-release_date = "2025-09-30"
-last_updated = "2025-09-30"
-attachment = true
-reasoning = true
+base_model = "zhipuai/glm-4.6v-flash"
 reasoning_options = [{ type = "toggle" }]
-temperature = true
-tool_call = true
-open_weights = false
-knowledge = "2024-10"
 
 [limit]
-context = 128000
-output = 24000
+output = 24_000
 
 [modalities]
 input = ["text", "image", "pdf"]
-output = ["text"]