diff --git a/packages/core/src/__tests__/bootstrap-connections.test.ts b/packages/core/src/__tests__/bootstrap-connections.test.ts
index 74de9047a8..b60b240164 100644
--- a/packages/core/src/__tests__/bootstrap-connections.test.ts
+++ b/packages/core/src/__tests__/bootstrap-connections.test.ts
@@ -20,11 +20,22 @@ import {
   OPENCODE_FREE_DEFAULT_ENABLED_MODELS,
   OPENCODE_FREE_DEFAULT_MODEL,
   OPENCODE_FREE_LEGACY_DEFAULT_MODEL,
+  defaultEnabledModelIdsWhenOmitted,
   resolveBootstrapConnections,
   resolveOpenCodeFreeBootstrapMigration,
 } from '../bootstrap-connections.js';
 import type { LlmConnection } from '../llm-connections.js';
 
+describe('defaultEnabledModelIdsWhenOmitted', () => {
+  it('fills OpenCode Free with the default free inventory and leaves others unset', () => {
+    assert.deepEqual(defaultEnabledModelIdsWhenOmitted('opencode-free'), [
+      ...OPENCODE_FREE_DEFAULT_ENABLED_MODELS,
+    ]);
+    assert.equal(defaultEnabledModelIdsWhenOmitted('openai'), undefined);
+    assert.equal(defaultEnabledModelIdsWhenOmitted('openrouter'), undefined);
+  });
+});
+
 describe('resolveBootstrapConnections — zero-credential default seed', () => {
   it('selects one default while keeping the credential-free fallback', () => {
     const cases = [
diff --git a/packages/core/src/bootstrap-connections.ts b/packages/core/src/bootstrap-connections.ts
index 94a5deb112..f7b79bfe13 100644
--- a/packages/core/src/bootstrap-connections.ts
+++ b/packages/core/src/bootstrap-connections.ts
@@ -16,7 +16,7 @@
 import type { LlmConnection, ProviderType, UpdateConnectionInput } from './llm-connections.js';
 
 export const OPENCODE_FREE_DEFAULT_MODEL = 'nemotron-3-ultra-free';
-/** Models enabled on a fresh OpenCode Free bootstrap (default first). */
+/** Models enabled on a fresh OpenCode Free connection (default first). */
 export const OPENCODE_FREE_DEFAULT_ENABLED_MODELS = [
   OPENCODE_FREE_DEFAULT_MODEL,
   'mimo-v2.5-free',
@@ -68,6 +68,25 @@ const OPENAI_ENV_SEED: Omit<BootstrapConnectionSeed, 'isDefault'> = {
   defaultModel: 'gpt-4o-mini',
 };
 
+/**
+ * Default `enabledModelIds` when a create call omits them.
+ *
+ * Most providers stay on the historical "only the default model" seed. OpenCode
+ * Free is the exception: #2431 made the free inventory the product default for
+ * both bootstrap and a user-driven "保存供应商" create, so omitting the field
+ * must not collapse back to a one-model connection.
+ *
+ * Returns `undefined` when create should keep the generic single-default rule.
+ * An explicit empty or partial list from the caller is still honored — this
+ * only fills a missing selection.
+ */
+export function defaultEnabledModelIdsWhenOmitted(
+  providerType: ProviderType,
+): readonly string[] | undefined {
+  if (providerType === 'opencode-free') return OPENCODE_FREE_DEFAULT_ENABLED_MODELS;
+  return undefined;
+}
+
 /**
  * Resolve the bootstrap connection seeds for a fresh install.
  *
diff --git a/packages/core/src/index.ts b/packages/core/src/index.ts
index 3614fbb742..ae93d39053 100644
--- a/packages/core/src/index.ts
+++ b/packages/core/src/index.ts
@@ -1500,6 +1500,7 @@ export {
   OPENCODE_FREE_DEFAULT_ENABLED_MODELS,
   OPENCODE_FREE_DEFAULT_MODEL,
   OPENCODE_FREE_LEGACY_DEFAULT_MODEL,
+  defaultEnabledModelIdsWhenOmitted,
   resolveBootstrapConnections,
   resolveOpenCodeFreeBootstrapMigration,
 } from './bootstrap-connections.js';
diff --git a/packages/storage/src/__tests__/connection-store.test.ts b/packages/storage/src/__tests__/connection-store.test.ts
index 5af78c40c3..1803eab998 100644
--- a/packages/storage/src/__tests__/connection-store.test.ts
+++ b/packages/storage/src/__tests__/connection-store.test.ts
@@ -38,6 +38,40 @@ describe('FileConnectionStore', () => {
     });
   });
 
+  // Onboarding "保存供应商" (and any other create path that only states a
+  // defaultModel) must land the same free inventory bootstrap seeds — not a
+  // one-model connection that then fails the first-run e2e contract.
+  test('creates OpenCode Free with the default free inventory when enabled models are omitted', async () => {
+    await withConnectionStore(async (store) => {
+      const created = await store.create({
+        slug: 'opencode-free',
+        name: 'OpenCode Free',
+        providerType: 'opencode-free',
+        defaultModel: 'nemotron-3-ultra-free',
+      });
+
+      assert.deepEqual(created.enabledModelIds, [
+        'nemotron-3-ultra-free',
+        'mimo-v2.5-free',
+        'deepseek-v4-flash-free',
+      ]);
+    });
+  });
+
+  test('still honors an explicit subset when creating OpenCode Free', async () => {
+    await withConnectionStore(async (store) => {
+      const created = await store.create({
+        slug: 'opencode-free',
+        name: 'OpenCode Free',
+        providerType: 'opencode-free',
+        defaultModel: 'nemotron-3-ultra-free',
+        enabledModelIds: ['nemotron-3-ultra-free'],
+      });
+
+      assert.deepEqual(created.enabledModelIds, ['nemotron-3-ultra-free']);
+    });
+  });
+
   test('migrates a legacy connection to only its default model enabled', async () => {
     await withConnectionStore(async (store, dir) => {
       await writeFile(
diff --git a/packages/storage/src/connection-store.ts b/packages/storage/src/connection-store.ts
index fd616deaaf..835f4662d3 100644
--- a/packages/storage/src/connection-store.ts
+++ b/packages/storage/src/connection-store.ts
@@ -1,5 +1,6 @@
 import { mkdir, readFile, rename, writeFile } from 'node:fs/promises';
 import { dirname, join } from 'node:path';
+import { defaultEnabledModelIdsWhenOmitted } from '@maka/core';
 import {
   PROVIDER_DEFAULTS,
   connectionEnabledModelIds,
@@ -83,7 +84,9 @@ class FileConnectionStore implements ConnectionStore {
         enabled: true,
         enabledModelIds: connectionEnabledModelIds({
           defaultModel,
-          enabledModelIds: input.enabledModelIds,
+          // Only fill a missing selection. Explicit [] / subset stays as stated.
+          enabledModelIds:
+            input.enabledModelIds ?? defaultEnabledModelIdsWhenOmitted(input.providerType),
         }),
         createdAt: now,
         updatedAt: now,