update model name to claude-sonnet-4-6 across docs and demos

Author: jamienewcomb

README.md

@@ -120,7 +120,7 @@ export async function POST(req: Request) {
   const newMsgs = messages.map((m) => m.message);
 
   const result = streamText({
-    model: anthropic('claude-sonnet-4-20250514'),
+    model: anthropic('claude-sonnet-4-6'),
     system: 'You are a helpful assistant.',
     messages: await convertToModelMessages([...historyMsgs, ...newMsgs]),
     abortSignal: turn.abortSignal,
@@ -315,7 +315,7 @@ await transport.cancel({ turnId: 'turn-abc' });
 
 // Server: the turn's abortSignal fires automatically
 const result = streamText({
-  model: anthropic('claude-sonnet-4-20250514'),
+  model: anthropic('claude-sonnet-4-6'),
   messages,
   abortSignal: turn.abortSignal, // Aborted when client cancels
 });

demo/vercel/react/use-chat/src/app/api/chat/route.ts

@@ -52,7 +52,7 @@ export async function POST(req: Request) {
   const allMessages = [...historyMsgs, ...newMsgs];
 
   const result = streamText({
-    model: anthropic('claude-sonnet-4-20250514'),
+    model: anthropic('claude-sonnet-4-6'),
     system: `You are a helpful assistant. When the user asks about weather, use the getWeather tool. If they don't specify a location, call getLocation first to get their coordinates, then call getWeather with a description of that location.`,
     messages: await convertToModelMessages(allMessages),
     tools,

demo/vercel/react/use-client-transport/src/app/api/chat/route.ts

@@ -210,7 +210,7 @@ export async function POST(req: Request) {
   const effectiveTools = disableApprovalForApprovedTools(toolApprovals);
 
   const result = streamText({
-    model: anthropic('claude-sonnet-4-20250514'),
+    model: anthropic('claude-sonnet-4-6'),
     system: `You are a helpful assistant. When the user asks about weather, use the getWeather tool. If they don't specify a location, call getLocation first to get their coordinates, then call getWeather with a description of that location. When the user asks about a weather forecast or upcoming weather, use getWeatherForecast.`,
     messages: modelMessages,
     tools: effectiveTools,

docs/get-started/vercel-use-chat.md

@@ -125,7 +125,7 @@ export async function POST(req: Request) {
   const allMessages = [...(history ?? []).map((h) => h.message), ...messages.map((m) => m.message)];
 
   const result = streamText({
-    model: anthropic('claude-sonnet-4-20250514'),
+    model: anthropic('claude-sonnet-4-6'),
     system: 'You are a helpful assistant.',
     messages: await convertToModelMessages(allMessages),
     abortSignal: turn.abortSignal,