zen: support 1M claude context

packages/console/app/src/routes/zen/util/handler.ts

@@ -67,7 +67,7 @@ export async function handler(
         const headers = input.request.headers
         headers.delete("host")
         headers.delete("content-length")
-        providerInfo.modifyHeaders(headers, providerInfo.apiKey)
+        providerInfo.modifyHeaders(headers, body, providerInfo.apiKey)
         Object.entries(providerInfo.headerMappings ?? {}).forEach(([k, v]) => {
           headers.set(k, headers.get(v)!)
         })

packages/console/app/src/routes/zen/util/provider/anthropic.ts

@@ -17,9 +17,12 @@ type Usage = {
 export const anthropicHelper = {
   format: "anthropic",
   modifyUrl: (providerApi: string) => providerApi + "/messages",
-  modifyHeaders: (headers: Headers, apiKey: string) => {
+  modifyHeaders: (headers: Headers, body: Record<string, any>, apiKey: string) => {
     headers.set("x-api-key", apiKey)
     headers.set("anthropic-version", headers.get("anthropic-version") ?? "2023-06-01")
+    if (body.model.startsWith("claude-sonnet-")) {
+      headers.set("anthropic-beta", "context-1m-2025-08-07")
+    }
   },
   modifyBody: (body: Record<string, any>) => {
     return {

packages/console/app/src/routes/zen/util/provider/openai-compatible.ts

@@ -24,7 +24,7 @@ type Usage = {
 export const oaCompatHelper = {
   format: "oa-compat",
   modifyUrl: (providerApi: string) => providerApi + "/chat/completions",
-  modifyHeaders: (headers: Headers, apiKey: string) => {
+  modifyHeaders: (headers: Headers, body: Record<string, any>, apiKey: string) => {
     headers.set("authorization", `Bearer ${apiKey}`)
   },
   modifyBody: (body: Record<string, any>) => {

packages/console/app/src/routes/zen/util/provider/openai.ts

@@ -15,7 +15,7 @@ type Usage = {
 export const openaiHelper = {
   format: "openai",
   modifyUrl: (providerApi: string) => providerApi + "/responses",
-  modifyHeaders: (headers: Headers, apiKey: string) => {
+  modifyHeaders: (headers: Headers, body: Record<string, any>, apiKey: string) => {
     headers.set("authorization", `Bearer ${apiKey}`)
   },
   modifyBody: (body: Record<string, any>) => {

packages/console/app/src/routes/zen/util/provider/provider.ts

@@ -28,7 +28,7 @@ import {
 export type ProviderHelper = {
   format: Format
   modifyUrl: (providerApi: string) => string
-  modifyHeaders: (headers: Headers, apiKey: string) => void
+  modifyHeaders: (headers: Headers, body: Record<string, any>, apiKey: string) => void
   modifyBody: (body: Record<string, any>) => Record<string, any>
   createUsageParser: () => {
     parse: (chunk: string) => void