feat(providers): add xAI grok-4.5 model (#5511)

* feat(providers): add xAI grok-4.5 model

* fix(providers): correct grok-4.5 release date to API-availability date

Author: waleedlatif1

apps/sim/providers/models.ts

@@ -1852,6 +1852,20 @@ export const PROVIDER_DEFINITIONS: Record<string, ProviderDefinition> = {
       toolUsageControl: true,
     },
     models: [
+      {
+        id: 'grok-4.5',
+        pricing: {
+          input: 2.0,
+          output: 6.0,
+          updatedAt: '2026-07-08',
+        },
+        capabilities: {
+          temperature: { min: 0, max: 2 },
+        },
+        contextWindow: 500000,
+        releaseDate: '2026-07-08',
+        recommended: true,
+      },
       {
         id: 'grok-4.3',
         pricing: {
@@ -1865,7 +1879,6 @@ export const PROVIDER_DEFINITIONS: Record<string, ProviderDefinition> = {
         },
         contextWindow: 1000000,
         releaseDate: '2026-04-30',
-        recommended: true,
       },
       {
         id: 'grok-4-latest',