diff --git a/CHANGELOG.md b/CHANGELOG.md
index 250ae6de78..96966204ff 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@
 
 ### 🔧 Bug Fixes
 
+- **api:** include noAuth providers (opencode, etc.) in `/v1/models` active aliases so their models surface without a DB connection row (#2798)
 - **opencode-go:** route Qwen3.x via Claude messages format and repair `fixMissingToolResponses` helper for Claude-shape upstreams (#2791 — thanks @jeferssonlemes)
 - **validation:** register missing validation helper checks for web-cookie providers (`claude-web`, `gemini-web`, `copilot-web`, `t3-web`) (#2793 — thanks @oyi77)
 - **docker:** check and warn if `/app/data` is not writable in the Docker entrypoint script to fail fast with helpful host instructions (#2795 — thanks @hartmark)
diff --git a/src/app/api/v1/models/catalog.ts b/src/app/api/v1/models/catalog.ts
index de0478058a..229a8d7a2c 100644
--- a/src/app/api/v1/models/catalog.ts
+++ b/src/app/api/v1/models/catalog.ts
@@ -1,5 +1,5 @@
 import { PROVIDER_MODELS, PROVIDER_ID_TO_ALIAS } from "@/shared/constants/models";
-import { AI_PROVIDERS } from "@/shared/constants/providers";
+import { AI_PROVIDERS, NOAUTH_PROVIDERS } from "@/shared/constants/providers";
 import {
   getProviderConnections,
   getCombos,
@@ -345,6 +345,13 @@ export async function getUnifiedModelsResponse(
       registerConnectionKey(conn.provider, conn);
     }
 
+    // noAuth providers never create DB connection rows, so they are always active.
+    // Add their IDs and aliases unconditionally so the catalog gate does not filter them. (#2798)
+    for (const p of Object.values(NOAUTH_PROVIDERS)) {
+      activeAliases.add(p.id);
+      if ("alias" in p && typeof p.alias === "string") activeAliases.add(p.alias);
+    }
+
     const getConnectionsForProvider = (...keys: Array<string | null | undefined>) => {
       const seen = new Set<string>();
       const collected: typeof connections = [];
@@ -362,6 +369,11 @@ export async function getUnifiedModelsResponse(
     const providerSupportsModel = (providerKey: string, modelId: string) => {
       const providerId = aliasToProviderId[providerKey] || providerKey;
       const alias = providerIdToAlias[providerId] || providerKey;
+      // noAuth providers have no connection rows — treat every model as eligible. (#2798)
+      const isNoAuth = Object.values(NOAUTH_PROVIDERS).some(
+        (p) => p.id === providerId || p.id === providerKey || ("alias" in p && p.alias === alias)
+      );
+      if (isNoAuth) return true;
       return hasEligibleConnectionForModel(
         getConnectionsForProvider(providerKey, providerId, alias),
         modelId
diff --git a/tests/unit/models-catalog-route.test.ts b/tests/unit/models-catalog-route.test.ts
index 64266b1501..0362778920 100644
--- a/tests/unit/models-catalog-route.test.ts
+++ b/tests/unit/models-catalog-route.test.ts
@@ -236,11 +236,13 @@ test("v1 models catalog keeps only visible combos when no providers are active",
   const body = (await response.json()) as any;
 
   assert.equal(response.status, 200);
-  assert.deepEqual(
-    body.data.map((item) => item.id),
-    [visible.name]
-  );
-  assert.equal(body.data[0].context_length, 32000);
+  // The visible combo must be present (noAuth provider models may also appear — that is correct
+  // behavior after the fix for Issue #2798, so we check membership rather than exact equality).
+  const ids = body.data.map((item) => item.id);
+  assert.ok(ids.includes(visible.name), "visible combo must appear");
+  const visibleCombo = body.data.find((item) => item.id === visible.name);
+  assert.ok(visibleCombo, "visible combo entry must exist");
+  assert.equal(visibleCombo.context_length, 32000);
   assert.equal(
     body.data.some((item) => item.id === hidden.name),
     false
@@ -1337,3 +1339,22 @@ test("v1 models catalog prefers manual combo context_length over auto-calculated
   assert.ok(comboModel);
   assert.equal(comboModel.context_length, 64000, "manual context_length should override auto-calc");
 });
+
+// Regression test for Issue #2798: noAuth providers (opencode/oc) have no DB connection rows
+// but their models must still appear in /v1/models.
+test("v1 models catalog includes noAuth provider models when no DB connections exist (#2798)", async () => {
+  // No connections seeded — empty DB, simulating a fresh install with no credentials added.
+  const response = await v1ModelsCatalog.getUnifiedModelsResponse(
+    new Request("http://localhost/api/v1/models")
+  );
+  const body = (await response.json()) as any;
+  const ids: string[] = body.data.map((item: any) => item.id);
+
+  assert.equal(response.status, 200);
+  // opencode (noAuth) models must surface even with zero connection rows.
+  // The registry defines models under alias "oc" (e.g. "oc/big-pickle").
+  assert.ok(
+    ids.some((id) => id.startsWith("oc/") || id.startsWith("opencode/")),
+    `Expected at least one oc/* or opencode/* model in /v1/models but got none. IDs sample: ${ids.slice(0, 10).join(", ")}`
+  );
+});