feat(api): add hidePaidModels setting to filter paid-only models from /v1/models catalog

CHANGELOG.md

@@ -31,6 +31,7 @@
 
 ### 🐛 Bug Fixes
 
+- **feat(api):** add a `hidePaidModels` setting that filters paid-only models out of the `/v1/models` catalog. Regression guard: `tests/unit/models-catalog-hide-paid.test.ts`. (thanks @chirag127)
 - **fix(api-manager):** the fallback model picker now preserves combos instead of dropping them when a primary model is unavailable. Regression guard: `tests/unit/api-manager-page-static.test.ts`. (thanks @jmengit)
 - **fix(providers):** recoverable Antigravity / Cloudflare `403` responses are now classified as retryable instead of terminal, so a transient WAF block no longer bans the connection. Regression guard: `tests/unit/errorclassifier-antigravity-403.test.ts`. (thanks @developerjillur)
 - **fix(mitm):** `sanitizeHeaders` now redacts `Set-Cookie` response headers so upstream session cookies never leak into logs / diagnostics. Regression guard: `tests/unit/mitm-sanitize-headers.test.ts`. (thanks @developerjillur)

src/app/api/v1/models/catalog.ts

@@ -74,6 +74,7 @@ import {
 import { getVisionCapabilityFields, getCustomVisionCapabilityFields } from "./catalogVision";
 import { FALLBACK_ALIAS_TO_PROVIDER, buildAliasMaps } from "./catalogProviderMaps";
 import { getModelCatalogAuthRejection, isCodexModelCatalogClient } from "./catalogRequest";
+import { isFreeModel, providerHasFreeModels } from "@/shared/utils/freeModels";
 
 // Public API of this module is preserved after the catalog helper extraction:
 // `isVisionModelId` (vision-detection-consistency.test.ts) and
@@ -234,6 +235,19 @@ async function buildUnifiedModelsResponseCore(
       aliasOrProviderId;
     // Issue #96: Allow blocking specific providers from the models list
     const blockedProviders = normalizeBlockedProviderSet(settings.blockedProviders);
+    // #6316: Opt-in filter — hide paid-only models via `isFreeModel()`. Only applied to
+    // PROVIDER_MODELS + OpenRouter loops (where pricing metadata / :free suffix / catalog
+    // membership is available). Modality registries (embedding/image/rerank/audio/
+    // moderation/video/music) represent local capabilities without pricing, so they are
+    // exempt. Combos + auto/* + synced/custom/alias-backed rows also stay unfiltered —
+    // extending v1 scope to those requires per-entry pricing lookup not available today.
+    const hidePaid = settings.hidePaidModels === true;
+    const shouldHidePaid = (providerKey: string, modelId: string, pricing?: unknown): boolean => {
+      if (!hidePaid) return false;
+      const provider = aliasToProviderId[providerKey] || providerKey;
+      if (!providerHasFreeModels(provider)) return true;
+      return !isFreeModel(provider, { id: modelId, pricing: pricing as any });
+    };
 
     // Get active provider connections
     let connections = [];
@@ -678,6 +692,7 @@ async function buildUnifiedModelsResponseCore(
         if (!providerSupportsModel(canonicalProviderId, model.id)) continue;
         const aliasId = `${alias}/${model.id}`;
         if (getModelIsHidden(canonicalProviderId, model.id)) continue;
+        if (shouldHidePaid(canonicalProviderId, model.id, (model as any).pricing)) continue;
 
         const visionFields =
           getVisionCapabilityFields(aliasId) || getVisionCapabilityFields(model.id);
@@ -887,6 +902,7 @@ async function buildUnifiedModelsResponseCore(
           );
           const modelType = getOpenRouterModelType(inputModalities, outputModalities);
           const isFree = isOpenRouterFreeModel(openRouterModel);
+          if (hidePaid && !isFree) continue;
           const supportedParameters = Array.isArray(openRouterModel.supported_parameters)
             ? openRouterModel.supported_parameters
             : [];

src/lib/db/settings.ts

@@ -151,6 +151,11 @@ export async function getSettings() {
     perKeyProxyEnabled: false,
     customSystemPromptEnabled: false,
     customSystemPrompt: "",
+    // #6316: Opt-in filter that hides paid-only models from the /v1/models catalog.
+    // Uses isFreeModel() from src/shared/utils/freeModels.ts to detect free entries
+    // (`:free` suffix, zero-price pricing, or FREE_MODEL_BUDGETS membership). Default
+    // false preserves prior behaviour; opt-in only.
+    hidePaidModels: false,
   };
   for (const row of rows) {
     const record = toRecord(row);

tests/unit/models-catalog-hide-paid.test.ts

@@ -0,0 +1,66 @@
+/**
+ * #6316 — `hidePaidModels` settings toggle filters paid-only models from the
+ * unified `/v1/models` catalog. Uses `isFreeModel()` from
+ * `src/shared/utils/freeModels.ts` (`:free` suffix, zero-price pricing, or
+ * FREE_MODEL_BUDGETS membership). Modality registries are exempt (no pricing).
+ * Rule #18 regression guard for the toggle.
+ */
+import test from "node:test";
+import assert from "node:assert/strict";
+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+
+const TEST_DATA_DIR = fs.mkdtempSync(path.join(os.tmpdir(), "omniroute-hide-paid-"));
+process.env.DATA_DIR = TEST_DATA_DIR;
+
+const core = await import("../../src/lib/db/core.ts");
+const settingsDb = await import("../../src/lib/db/settings.ts");
+const providersDb = await import("../../src/lib/db/providers.ts");
+const v1ModelsCatalog = await import("../../src/app/api/v1/models/catalog.ts");
+
+async function fetchCatalog(): Promise<Array<{ id: string; type?: string }>> {
+  const res = await v1ModelsCatalog.getUnifiedModelsResponse(
+    new Request("http://localhost/api/v1/models", { method: "GET" })
+  );
+  assert.equal(res.status, 200);
+  const body = (await res.json()) as { data: Array<{ id: string; type?: string }> };
+  return body.data;
+}
+
+test.after(() => {
+  core.resetDbInstance();
+  try {
+    fs.rmSync(TEST_DATA_DIR, { recursive: true, force: true });
+  } catch {
+    /* best-effort */
+  }
+});
+
+test("hidePaidModels default is false + toggles the catalog filter", async () => {
+  const defaults = await settingsDb.getSettings();
+  assert.equal(defaults.hidePaidModels, false);
+
+  await providersDb.createProviderConnection({
+    provider: "openai",
+    authType: "apikey",
+    name: "openai-main",
+    apiKey: "sk-test",
+    isActive: true,
+  });
+
+  // Chat-only assertion. Modality registries (embedding/image/audio/moderation)
+  // are exempt from the paid filter by design (no pricing metadata).
+  const isPaidChat = (m: { id: string; type?: string }) =>
+    (m.type === undefined || m.type === "chat") &&
+    (/^(openai|oa)\/gpt-/.test(m.id) || /^(openai|oa)\/o[1-9]/.test(m.id));
+
+  await settingsDb.updateSettings({ hidePaidModels: false });
+  const off = await fetchCatalog();
+  assert.equal(off.some(isPaidChat), true, "expected paid OpenAI chat models when toggle is off");
+
+  await settingsDb.updateSettings({ hidePaidModels: true });
+  const on = await fetchCatalog();
+  const leaked = on.filter(isPaidChat).map((m) => m.id);
+  assert.deepEqual(leaked, [], `paid OpenAI chat aliases leaked: ${leaked.join(", ")}`);
+});