diff --git a/packages/core/src/sync/index.ts b/packages/core/src/sync/index.ts
index 19cc36af4..eaeb0ebe7 100644
--- a/packages/core/src/sync/index.ts
+++ b/packages/core/src/sync/index.ts
@@ -44,13 +44,17 @@ export interface SyncProvider<SourceModel> {
   name: string;
   modelsDir: string;
   skipCreates?: boolean;
+  preserveMissing?: string[];
   sourceID?(model: SourceModel): string;
   skippedNotice?(ids: string[]): string[];
   fetchModels(): Promise<unknown>;
   parseModels(raw: unknown): SourceModel[];
   translateModel(
     model: SourceModel,
-    context: { existing(id: string): ExistingModel | undefined },
+    context: {
+      existing(id: string): ExistingModel | undefined;
+      authored(id: string): ExistingModel | undefined;
+    },
   ): { id: string; model: SyncedModel } | undefined;
 }
 
@@ -106,6 +110,7 @@ export async function syncProvider<SourceModel>(
   const existing = await readExisting(provider.modelsDir);
   const sourceModels = provider.parseModels(await provider.fetchModels());
   const desired = new Map<string, { model: z.infer<typeof SyncedAuthoredModel>; content: string }>();
+  const preserveMissing = new Set(provider.preserveMissing ?? []);
   const skippedRemote: string[] = [];
 
   for (const sourceModel of sourceModels) {
@@ -113,6 +118,9 @@ export async function syncProvider<SourceModel>(
       existing(id) {
         return existing.get(`${id}.toml`)?.toml;
       },
+      authored(id) {
+        return existing.get(`${id}.toml`)?.authored;
+      },
     });
     if (translated === undefined) {
       if (provider.skipCreates) skippedRemote.push(provider.sourceID?.(sourceModel) ?? "unknown");
@@ -182,8 +190,10 @@ export async function syncProvider<SourceModel>(
 
   for (const relativePath of existing.keys()) {
     if (desired.has(relativePath)) continue;
-    if (options.newOnly) {
-      console.log(`Skipping removal in new-only mode: ${relativePath}`);
+    const id = relativePath.slice(0, -5);
+    if (options.newOnly || preserveMissing.has(id)) {
+      const mode = options.newOnly ? "new-only mode" : "preserve list";
+      console.log(`Skipping removal in ${mode}: ${relativePath}`);
       unchanged++;
       continue;
     }
diff --git a/packages/core/src/sync/providers/google.ts b/packages/core/src/sync/providers/google.ts
index bf79dac45..56920c962 100644
--- a/packages/core/src/sync/providers/google.ts
+++ b/packages/core/src/sync/providers/google.ts
@@ -32,6 +32,8 @@ export const google = {
   name: "Google",
   modelsDir: "providers/google/models",
   skipCreates: true,
+  // v1beta/models omits Gemini-TTS models served by Cloud TTS / Vertex AI.
+  preserveMissing: ["gemini-2.5-flash-tts"],
   sourceID(model) {
     return model.name.replace(/^models\//, "");
   },
@@ -81,12 +83,16 @@ export const google = {
 
     return {
       id,
-      model: buildModel(model, existing),
+      model: buildModel(model, existing, context.authored(id)),
     };
   },
 } satisfies SyncProvider<GoogleModel>;
 
-function buildModel(model: GoogleModel, existing: ExistingModel): SyncedModel {
+function buildModel(
+  model: GoogleModel,
+  existing: ExistingModel,
+  authored: ExistingModel | undefined,
+): SyncedModel {
   const name = existing.name;
   const releaseDate = existing.release_date;
   const lastUpdated = existing.last_updated;
@@ -111,6 +117,27 @@ function buildModel(model: GoogleModel, existing: ExistingModel): SyncedModel {
     throw new Error(`Google model ${model.name} has incomplete local TOML metadata required for sync`);
   }
 
+  if (authored?.base_model !== undefined) {
+    const result: SyncedModel = { ...authored, base_model: authored.base_model };
+    const limitOverride = { ...authored.limit };
+    if (model.inputTokenLimit !== limit.context) {
+      limitOverride.context = model.inputTokenLimit;
+    }
+    if (model.outputTokenLimit !== limit.output) {
+      limitOverride.output = model.outputTokenLimit;
+    }
+    if (
+      limitOverride.context !== undefined
+      || limitOverride.input !== undefined
+      || limitOverride.output !== undefined
+    ) {
+      result.limit = limitOverride;
+    } else {
+      delete result.limit;
+    }
+    return result;
+  }
+
   return {
     base_model: existing.base_model,
     base_model_omit: existing.base_model_omit,
diff --git a/providers/google/models/gemini-3-pro-image-preview.toml b/providers/google/models/gemini-3-pro-image-preview.toml
index 98a4ae2c5..a68249299 100644
--- a/providers/google/models/gemini-3-pro-image-preview.toml
+++ b/providers/google/models/gemini-3-pro-image-preview.toml
@@ -3,3 +3,6 @@ base_model = "google/gemini-3-pro-image-preview"
 [cost]
 input = 2
 output = 120
+
+[limit]
+context = 131_072