diff --git a/components/chat/artifact.tsx b/components/chat/artifact.tsx
index b37c9cc..e233eff 100644
--- a/components/chat/artifact.tsx
+++ b/components/chat/artifact.tsx
@@ -162,7 +162,7 @@ function PureArtifact({
 
           const currentDocument = currentDocuments.at(-1);
 
-          if (!currentDocument || !currentDocument.content) {
+          if (!currentDocument?.content) {
             setIsContentDirty(false);
             return currentDocuments;
           }
diff --git a/lib/ai/providers.ts b/lib/ai/providers.ts
index 46f3185..afe224b 100644
--- a/lib/ai/providers.ts
+++ b/lib/ai/providers.ts
@@ -1,6 +1,10 @@
-import { customProvider, gateway } from "ai";
+import { createAnthropic } from "@ai-sdk/anthropic";
+import { customProvider } from "ai";
 import { isTestEnvironment } from "../constants";
-import { titleModel } from "./models";
+
+const anthropic = createAnthropic({
+  apiKey: process.env.ANTHROPIC_API_KEY,
+});
 
 export const myProvider = isTestEnvironment
   ? (() => {
@@ -19,12 +23,16 @@ export function getLanguageModel(modelId: string) {
     return myProvider.languageModel(modelId);
   }
 
-  return gateway.languageModel(modelId);
+  // Strip provider prefix (e.g. "anthropic/claude-sonnet-4-6" -> "claude-sonnet-4-6")
+  const id = modelId.includes("/")
+    ? modelId.split("/").slice(1).join("/")
+    : modelId;
+  return anthropic(id);
 }
 
 export function getTitleModel() {
   if (isTestEnvironment && myProvider) {
     return myProvider.languageModel("title-model");
   }
-  return gateway.languageModel(titleModel.id);
+  return anthropic("claude-haiku-4-5-20251001");
 }
diff --git a/lib/ai/tools/request-suggestions.ts b/lib/ai/tools/request-suggestions.ts
index 36ac13d..2c6c3cd 100644
--- a/lib/ai/tools/request-suggestions.ts
+++ b/lib/ai/tools/request-suggestions.ts
@@ -31,7 +31,7 @@ export const requestSuggestions = ({
     execute: async ({ documentId }) => {
       const document = await getDocumentById({ id: documentId });
 
-      if (!document || !document.content) {
+      if (!document?.content) {
         return {
           error: "Document not found",
         };
diff --git a/lib/editor/config.ts b/lib/editor/config.ts
index 1d73e85..6e30fe3 100644
--- a/lib/editor/config.ts
+++ b/lib/editor/config.ts
@@ -30,7 +30,7 @@ export const handleTransaction = ({
   editorRef: MutableRefObject<EditorView | null>;
   onSaveContent: (updatedContent: string, debounce: boolean) => void;
 }) => {
-  if (!editorRef || !editorRef.current) {
+  if (!editorRef?.current) {
     return;
   }
 
diff --git a/package.json b/package.json
index 220a564..6ca59d4 100644
--- a/package.json
+++ b/package.json
@@ -18,6 +18,7 @@
     "test": "export PLAYWRIGHT=True && pnpm exec playwright test"
   },
   "dependencies": {
+    "@ai-sdk/anthropic": "^3.0.66",
     "@ai-sdk/provider": "^3.0.3",
     "@ai-sdk/react": "3.0.118",
     "@codemirror/lang-python": "^6.1.6",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index b58ffa4..79aac94 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -8,6 +8,9 @@ importers:
 
   .:
     dependencies:
+      '@ai-sdk/anthropic':
+        specifier: ^3.0.66
+        version: 3.0.66(zod@3.25.76)
       '@ai-sdk/provider':
         specifier: ^3.0.3
         version: 3.0.3
@@ -258,6 +261,12 @@ importers:
 
 packages:
 
+  '@ai-sdk/anthropic@3.0.66':
+    resolution: {integrity: sha512-yJpQ2x6ACwbXo5D6HsVWd2FFnnWcetfGx4oxkG66P8FawusvrY2vL2qMiiNTruWrxEYDy+YHc3ctv8C769MMJA==}
+    engines: {node: '>=18'}
+    peerDependencies:
+      zod: ^3.25.76 || ^4.1.8
+
   '@ai-sdk/gateway@3.0.66':
     resolution: {integrity: sha512-SIQ0YY0iMuv+07HLsZ+bB990zUJ6S4ujORAh+Jv1V2KGNn73qQKnGO0JBk+w+Res8YqOFSycwDoWcFlQrVxS4A==}
     engines: {node: '>=18'}
@@ -270,6 +279,12 @@ packages:
     peerDependencies:
       zod: ^3.25.76 || ^4.1.8
 
+  '@ai-sdk/provider-utils@4.0.22':
+    resolution: {integrity: sha512-B2OTFcRw/Pdka9ZTjpXv6T6qZ6RruRuLokyb8HwW+aoW9ndJ3YasA3/mVswyJw7VMBF8ofXgqvcrCt9KYvFifg==}
+    engines: {node: '>=18'}
+    peerDependencies:
+      zod: ^3.25.76 || ^4.1.8
+
   '@ai-sdk/provider@3.0.3':
     resolution: {integrity: sha512-qGPYdoAuECaUXPrrz0BPX1SacZQuJ6zky0aakxpW89QW1hrY0eF4gcFm/3L9Pk8C5Fwe+RvBf2z7ZjDhaPjnlg==}
     engines: {node: '>=18'}
@@ -4071,6 +4086,12 @@ packages:
 
 snapshots:
 
+  '@ai-sdk/anthropic@3.0.66(zod@3.25.76)':
+    dependencies:
+      '@ai-sdk/provider': 3.0.8
+      '@ai-sdk/provider-utils': 4.0.22(zod@3.25.76)
+      zod: 3.25.76
+
   '@ai-sdk/gateway@3.0.66(zod@3.25.76)':
     dependencies:
       '@ai-sdk/provider': 3.0.8
@@ -4085,6 +4106,13 @@ snapshots:
       eventsource-parser: 3.0.6
       zod: 3.25.76
 
+  '@ai-sdk/provider-utils@4.0.22(zod@3.25.76)':
+    dependencies:
+      '@ai-sdk/provider': 3.0.8
+      '@standard-schema/spec': 1.1.0
+      eventsource-parser: 3.0.6
+      zod: 3.25.76
+
   '@ai-sdk/provider@3.0.3':
     dependencies:
       json-schema: 0.4.0