diff --git a/packages/fold-agent/scripts/update-model-catalog.ts b/packages/fold-agent/scripts/update-model-catalog.ts
index 6bbbe20..a19517a 100644
--- a/packages/fold-agent/scripts/update-model-catalog.ts
+++ b/packages/fold-agent/scripts/update-model-catalog.ts
@@ -1,6 +1,6 @@
 /**
- * Regenerates `src/Catalog/BakedCatalog.ts` - the baked models.dev snapshot for the `anthropic` and
- * `openai` providers, already normalized to core `ModelCatalogEntry` rows. Reads a local snapshot
+ * Regenerates `src/Catalog/BakedCatalog.ts` - the baked models.dev snapshot for the `anthropic`,
+ * `openai`, and `xai` providers, normalized to core `ModelCatalogEntry` rows. Reads a local snapshot
  * from `/tmp/models_dev_api.json` when present (avoid hammering models.dev while iterating),
  * otherwise fetches `https://models.dev/api.json` fresh.
  *
@@ -19,7 +19,7 @@ import { modelCatalogEntriesFromModelsDev } from '../src/Catalog/Normalize'
 
 const SNAPSHOT_PATH = '/tmp/models_dev_api.json'
 const MODELS_DEV_URL = 'https://models.dev/api.json'
-const BAKED_PROVIDERS: ReadonlySet<string> = new Set(['anthropic', 'openai'])
+const BAKED_PROVIDERS: ReadonlySet<string> = new Set(['anthropic', 'openai', 'xai'])
 
 const scriptDir = dirname(fileURLToPath(import.meta.url))
 const targetPath = join(scriptDir, '..', 'src', 'Catalog', 'BakedCatalog.ts')
@@ -85,14 +85,14 @@ const entrySource = (entry: ModelCatalogEntry): string =>
 const fileSource = (entries: ReadonlyArray<ModelCatalogEntry>): string =>
 	[
 		'// GENERATED by scripts/update-model-catalog.ts - do not edit by hand.',
-		'// Baked models.dev snapshot for the anthropic and openai providers, normalized to ModelCatalogEntry.',
+		'// Baked models.dev snapshot for the anthropic, openai, and xai providers, normalized to ModelCatalogEntry.',
 		'// Regenerate: bun packages/fold-agent/scripts/update-model-catalog.ts',
 		"import type { ModelCatalogEntry } from '@humanlayer/fold-core'",
 		'',
 		'/**',
 		' * The offline model catalog: the last-resort fallback when neither a cached nor a freshly fetched',
-		' * models.dev catalog is available (D15). Covers every anthropic and openai model models.dev knew',
-		' * at generation time.',
+		' * models.dev catalog is available (D15). Covers every anthropic, openai, and xai model models.dev',
+		' * knew at generation time.',
 		' */',
 		'export const bakedModelCatalog: ReadonlyArray<ModelCatalogEntry> = [',
 		...entries.map(entrySource),
@@ -112,7 +112,7 @@ const main = Effect.gen(function* () {
 
 	if (entries.length === 0) {
 		return yield* new CatalogBakeError({
-			message: 'no anthropic/openai entries survived normalization; refusing to bake',
+			message: 'no anthropic/openai/xai entries survived normalization; refusing to bake',
 		})
 	}
 
diff --git a/packages/fold-agent/src/Catalog/BakedCatalog.ts b/packages/fold-agent/src/Catalog/BakedCatalog.ts
index 80e275b..9fb45d3 100644
--- a/packages/fold-agent/src/Catalog/BakedCatalog.ts
+++ b/packages/fold-agent/src/Catalog/BakedCatalog.ts
@@ -1,12 +1,12 @@
 // GENERATED by scripts/update-model-catalog.ts - do not edit by hand.
-// Baked models.dev snapshot for the anthropic and openai providers, normalized to ModelCatalogEntry.
+// Baked models.dev snapshot for the anthropic, openai, and xai providers, normalized to ModelCatalogEntry.
 // Regenerate: bun packages/fold-agent/scripts/update-model-catalog.ts
 import type { ModelCatalogEntry } from '@humanlayer/fold-core'
 
 /**
  * The offline model catalog: the last-resort fallback when neither a cached nor a freshly fetched
- * models.dev catalog is available (D15). Covers every anthropic and openai model models.dev knew
- * at generation time.
+ * models.dev catalog is available (D15). Covers every anthropic, openai, and xai model models.dev
+ * knew at generation time.
  */
 export const bakedModelCatalog: ReadonlyArray<ModelCatalogEntry> = [
 	{
@@ -1001,4 +1001,30 @@ export const bakedModelCatalog: ReadonlyArray<ModelCatalogEntry> = [
 		toolCall: false,
 		pricing: { inputPerMTokens: 0.1, outputPerMTokens: 0, cacheReadPerMTokens: null, cacheWritePerMTokens: null },
 	},
+	{
+		providerId: 'xai',
+		modelId: 'grok-4.5',
+		name: 'Grok 4.5',
+		contextWindow: 500000,
+		maxInputTokens: null,
+		maxOutputTokens: 500000,
+		reasoning: true,
+		reasoningEfforts: ['low', 'medium', 'high'],
+		vision: true,
+		toolCall: true,
+		pricing: { inputPerMTokens: 2, outputPerMTokens: 6, cacheReadPerMTokens: 0.3, cacheWritePerMTokens: null },
+	},
+	{
+		providerId: 'xai',
+		modelId: 'grok-4.6',
+		name: 'Grok 4.6',
+		contextWindow: 500000,
+		maxInputTokens: null,
+		maxOutputTokens: 500000,
+		reasoning: true,
+		reasoningEfforts: ['low', 'medium', 'high', 'xhigh'],
+		vision: true,
+		toolCall: true,
+		pricing: { inputPerMTokens: 2, outputPerMTokens: 6, cacheReadPerMTokens: 0.5, cacheWritePerMTokens: null },
+	},
 ]
diff --git a/packages/fold-agent/test/Catalog/BakedCatalog.vi.test.ts b/packages/fold-agent/test/Catalog/BakedCatalog.vi.test.ts
index 1f9427e..8ba8b9a 100644
--- a/packages/fold-agent/test/Catalog/BakedCatalog.vi.test.ts
+++ b/packages/fold-agent/test/Catalog/BakedCatalog.vi.test.ts
@@ -28,6 +28,15 @@ const openAiTerra: ActiveModel = {
 	reasoning: { _tag: 'effort', effort: 'max' },
 }
 
+const xaiGrok: ActiveModel = {
+	providerId: 'xai',
+	providerKind: 'openai-compatible',
+	modelId: 'grok-4.6',
+	role: null,
+	requestedReasoningLevel: 'xhigh',
+	reasoning: { _tag: 'effort', effort: 'xhigh' },
+}
+
 it('resolves a codex-kind gpt-5.6-sol to the baked openai entry', () => {
 	const entry = lookupCatalogEntry(bakedModelCatalog, codexSol)
 
@@ -51,3 +60,15 @@ it('resolves an openai-compatible gpt-5.6-terra to the baked openai entry', () =
 	expect(entry?.pricing?.outputPerMTokens).toBe(15)
 	expect(entry?.reasoningEfforts).toContain('max')
 })
+
+it('resolves the supported Grok model to the baked xAI entry', () => {
+	const entry = lookupCatalogEntry(bakedModelCatalog, xaiGrok)
+
+	expect(entry).not.toBeNull()
+	expect(entry?.providerId).toBe('xai')
+	expect(entry?.modelId).toBe('grok-4.6')
+	expect(entry?.contextWindow).toBe(500_000)
+	expect(entry?.pricing?.inputPerMTokens).toBe(2)
+	expect(entry?.pricing?.outputPerMTokens).toBe(6)
+	expect(entry?.reasoningEfforts).toContain('xhigh')
+})