fix(models): mark NVIDIA Nemotron 3 Super retired and move the NVIDIA default

NVIDIA's model page states the nvidia/nemotron-3-super-120b-a12b API is no
longer supported after 2026-10-19, and Pi 1.0.1 dropped it as its NVIDIA
default for the same reason. Mark it deprecated (hidden from pickers, still a
known id for pinned workflows) and default the NVIDIA provider to Nemotron 3
Ultra, which the Pi catalog also serves.

The Mistral IDs Pi 1.5 dropped (mistral-large-2411, devstral-small-2507,
devstral-medium-2507) were retired by Mistral on 2026-05-31 and are already
deprecated here, so saved Pi blocks fail before credentials with the
choose-a-model error instead of being mapped onto a different model.

Author: waleedlatif1

apps/sim/providers/models.ts

@@ -3971,7 +3971,7 @@ export const PROVIDER_DEFINITIONS: Record<string, ProviderDefinition> = {
     id: 'nvidia',
     name: 'NVIDIA NIM',
     description: "NVIDIA's Nemotron models via NIM's OpenAI-compatible API",
-    defaultModel: 'nvidia/nemotron-3-super-120b-a12b',
+    defaultModel: 'nvidia/nemotron-3-ultra-550b-a55b',
     modelPatterns: [/^nvidia\//],
     icon: NvidiaIcon,
     color: '#77B900',
@@ -4069,7 +4069,7 @@ export const PROVIDER_DEFINITIONS: Record<string, ProviderDefinition> = {
         },
         contextWindow: 1048576,
         releaseDate: '2026-03-11',
-        recommended: true,
+        sunset: { status: 'deprecated' },
       },
       {
         id: 'nvidia/nemotron-3-ultra-550b-a55b',

apps/sim/providers/pi-providers.test.ts

@@ -32,11 +32,15 @@ describe('Pi provider catalog', () => {
     )
   })
 
-  it('rejects saved model IDs removed by Pi 1.0 without substituting another model', () => {
+  it('rejects saved model IDs removed by Pi without substituting another model', () => {
     expect(resolvePiModelId('anthropic', 'claude-opus-4-1')).toBeUndefined()
     expect(resolvePiModelId('cerebras', 'cerebras/zai-glm-4.7')).toBeUndefined()
     expect(resolvePiModelId('zai', 'glm-5.1')).toBeUndefined()
     expect(resolvePiModelId('zai', 'glm-4.5-air')).toBeUndefined()
+    expect(resolvePiModelId('mistral', 'mistral-large-2411')).toBeUndefined()
+    expect(resolvePiModelId('mistral', 'devstral-small-2507')).toBeUndefined()
+    expect(resolvePiModelId('mistral', 'devstral-medium-2507')).toBeUndefined()
+    expect(resolvePiModelId('nvidia', 'nvidia/nemotron-3-super-120b-a12b')).toBeUndefined()
   })
 
   it('rejects provider/model pairs absent from the installed Pi catalog', () => {