diff --git a/apps/server/src/provider/Layers/CodexProvider.ts b/apps/server/src/provider/Layers/CodexProvider.ts
index 57b0cab334bb..f65d4432ab6a 100644
--- a/apps/server/src/provider/Layers/CodexProvider.ts
+++ b/apps/server/src/provider/Layers/CodexProvider.ts
@@ -115,6 +115,8 @@ export function codexPlanLabel(planType: string | null | undefined): string | un
       return "ChatGPT Pro 20x Subscription";
     case "prolite":
       return "ChatGPT Pro 5x Subscription";
+    case "promax":
+      return "ChatGPT Pro 25x Subscription";
     case "team":
       return "ChatGPT Team Subscription";
     case "self_serve_business_prolite":
diff --git a/packages/effect-codex-app-server/scripts/generate.ts b/packages/effect-codex-app-server/scripts/generate.ts
index b2696097ef8c..dbcf55c6c663 100644
--- a/packages/effect-codex-app-server/scripts/generate.ts
+++ b/packages/effect-codex-app-server/scripts/generate.ts
@@ -145,6 +145,12 @@ const ManualSchemas: Record<string, Schema.Json> = {
   },
 };
 
+// Codex ships new ChatGPT plans between protocol refreshes and reads unknown
+// ones as `unknown`. Accept any plan so a new one cannot fail account reads.
+const DefinitionSchemaOverrides: Record<string, Schema.Json> = {
+  PlanType: { type: "string" },
+};
+
 const getGeneratedPaths = Effect.fn("getGeneratedPaths")(function* () {
   const path = yield* Path.Path;
   const generatedDir = path.join(import.meta.dirname, "..", "src", "_generated");
@@ -643,7 +649,7 @@ const generateFiles = Effect.fn("generateFiles")(function* () {
       aggregateSchemas[localDefinitionNames.get(definitionName)!] = stripNullDefaults(
         normalizeNullableTypes(
           rewriteExternalRefs(
-            definitionSchema,
+            DefinitionSchemaOverrides[definitionName] ?? definitionSchema,
             localDefinitionNames,
             file.namespace,
             exportNameByQualifiedName,
diff --git a/packages/effect-codex-app-server/src/_generated/schema.gen.ts b/packages/effect-codex-app-server/src/_generated/schema.gen.ts
index 9bc7b1ec1e9e..e9ac22ec120b 100644
--- a/packages/effect-codex-app-server/src/_generated/schema.gen.ts
+++ b/packages/effect-codex-app-server/src/_generated/schema.gen.ts
@@ -3204,43 +3204,10 @@ export const ServerNotification__AuthMode = Schema.Union(
   identifier: "ServerNotification__AuthMode",
 });
 
-export type ServerNotification__PlanType =
-  | "free"
-  | "go"
-  | "plus"
-  | "pro"
-  | "prolite"
-  | "team"
-  | "self_serve_business_prolite"
-  | "self_serve_business_usage_based"
-  | "business"
-  | "ent26"
-  | "enterprise_cbp_automation"
-  | "enterprise_cbp_usage_based"
-  | "enterprise"
-  | "edu"
-  | "edu_plus"
-  | "edu_pro"
-  | "unknown";
-export const ServerNotification__PlanType = Schema.Literals([
-  "free",
-  "go",
-  "plus",
-  "pro",
-  "prolite",
-  "team",
-  "self_serve_business_prolite",
-  "self_serve_business_usage_based",
-  "business",
-  "ent26",
-  "enterprise_cbp_automation",
-  "enterprise_cbp_usage_based",
-  "enterprise",
-  "edu",
-  "edu_plus",
-  "edu_pro",
-  "unknown",
-]).annotate({ identifier: "ServerNotification__PlanType" });
+export type ServerNotification__PlanType = string;
+export const ServerNotification__PlanType = Schema.String.annotate({
+  identifier: "ServerNotification__PlanType",
+});
 
 export type ServerNotification__CreditsSnapshot = {
   readonly balance?: string | null;
@@ -4138,43 +4105,10 @@ export const V2AccountRateLimitsUpdatedNotification__SpendControlLimitSnapshot =
   used: Schema.String,
 }).annotate({ identifier: "V2AccountRateLimitsUpdatedNotification__SpendControlLimitSnapshot" });
 
-export type V2AccountRateLimitsUpdatedNotification__PlanType =
-  | "free"
-  | "go"
-  | "plus"
-  | "pro"
-  | "prolite"
-  | "team"
-  | "self_serve_business_prolite"
-  | "self_serve_business_usage_based"
-  | "business"
-  | "ent26"
-  | "enterprise_cbp_automation"
-  | "enterprise_cbp_usage_based"
-  | "enterprise"
-  | "edu"
-  | "edu_plus"
-  | "edu_pro"
-  | "unknown";
-export const V2AccountRateLimitsUpdatedNotification__PlanType = Schema.Literals([
-  "free",
-  "go",
-  "plus",
-  "pro",
-  "prolite",
-  "team",
-  "self_serve_business_prolite",
-  "self_serve_business_usage_based",
-  "business",
-  "ent26",
-  "enterprise_cbp_automation",
-  "enterprise_cbp_usage_based",
-  "enterprise",
-  "edu",
-  "edu_plus",
-  "edu_pro",
-  "unknown",
-]).annotate({ identifier: "V2AccountRateLimitsUpdatedNotification__PlanType" });
+export type V2AccountRateLimitsUpdatedNotification__PlanType = string;
+export const V2AccountRateLimitsUpdatedNotification__PlanType = Schema.String.annotate({
+  identifier: "V2AccountRateLimitsUpdatedNotification__PlanType",
+});
 
 export type V2AccountRateLimitsUpdatedNotification__RateLimitWindow = {
   readonly resetsAt?: number | null;
@@ -4260,43 +4194,10 @@ export const V2AccountUpdatedNotification__AuthMode = Schema.Union(
   identifier: "V2AccountUpdatedNotification__AuthMode",
 });
 
-export type V2AccountUpdatedNotification__PlanType =
-  | "free"
-  | "go"
-  | "plus"
-  | "pro"
-  | "prolite"
-  | "team"
-  | "self_serve_business_prolite"
-  | "self_serve_business_usage_based"
-  | "business"
-  | "ent26"
-  | "enterprise_cbp_automation"
-  | "enterprise_cbp_usage_based"
-  | "enterprise"
-  | "edu"
-  | "edu_plus"
-  | "edu_pro"
-  | "unknown";
-export const V2AccountUpdatedNotification__PlanType = Schema.Literals([
-  "free",
-  "go",
-  "plus",
-  "pro",
-  "prolite",
-  "team",
-  "self_serve_business_prolite",
-  "self_serve_business_usage_based",
-  "business",
-  "ent26",
-  "enterprise_cbp_automation",
-  "enterprise_cbp_usage_based",
-  "enterprise",
-  "edu",
-  "edu_plus",
-  "edu_pro",
-  "unknown",
-]).annotate({ identifier: "V2AccountUpdatedNotification__PlanType" });
+export type V2AccountUpdatedNotification__PlanType = string;
+export const V2AccountUpdatedNotification__PlanType = Schema.String.annotate({
+  identifier: "V2AccountUpdatedNotification__PlanType",
+});
 
 export type V2AppListUpdatedNotification__AppReview = { readonly status: string };
 export const V2AppListUpdatedNotification__AppReview = Schema.Struct({
@@ -5484,43 +5385,10 @@ export const V2GetAccountRateLimitsResponse__SpendControlLimitSnapshot = Schema.
   used: Schema.String,
 }).annotate({ identifier: "V2GetAccountRateLimitsResponse__SpendControlLimitSnapshot" });
 
-export type V2GetAccountRateLimitsResponse__PlanType =
-  | "free"
-  | "go"
-  | "plus"
-  | "pro"
-  | "prolite"
-  | "team"
-  | "self_serve_business_prolite"
-  | "self_serve_business_usage_based"
-  | "business"
-  | "ent26"
-  | "enterprise_cbp_automation"
-  | "enterprise_cbp_usage_based"
-  | "enterprise"
-  | "edu"
-  | "edu_plus"
-  | "edu_pro"
-  | "unknown";
-export const V2GetAccountRateLimitsResponse__PlanType = Schema.Literals([
-  "free",
-  "go",
-  "plus",
-  "pro",
-  "prolite",
-  "team",
-  "self_serve_business_prolite",
-  "self_serve_business_usage_based",
-  "business",
-  "ent26",
-  "enterprise_cbp_automation",
-  "enterprise_cbp_usage_based",
-  "enterprise",
-  "edu",
-  "edu_plus",
-  "edu_pro",
-  "unknown",
-]).annotate({ identifier: "V2GetAccountRateLimitsResponse__PlanType" });
+export type V2GetAccountRateLimitsResponse__PlanType = string;
+export const V2GetAccountRateLimitsResponse__PlanType = Schema.String.annotate({
+  identifier: "V2GetAccountRateLimitsResponse__PlanType",
+});
 
 export type V2GetAccountRateLimitsResponse__RateLimitWindow = {
   readonly resetsAt?: number | null;
@@ -5563,43 +5431,10 @@ export const V2GetAccountRateLimitsResponse__RateLimitReachedType = Schema.Liter
   "workspace_member_usage_limit_reached",
 ]).annotate({ identifier: "V2GetAccountRateLimitsResponse__RateLimitReachedType" });
 
-export type V2GetAccountResponse__PlanType =
-  | "free"
-  | "go"
-  | "plus"
-  | "pro"
-  | "prolite"
-  | "team"
-  | "self_serve_business_prolite"
-  | "self_serve_business_usage_based"
-  | "business"
-  | "ent26"
-  | "enterprise_cbp_automation"
-  | "enterprise_cbp_usage_based"
-  | "enterprise"
-  | "edu"
-  | "edu_plus"
-  | "edu_pro"
-  | "unknown";
-export const V2GetAccountResponse__PlanType = Schema.Literals([
-  "free",
-  "go",
-  "plus",
-  "pro",
-  "prolite",
-  "team",
-  "self_serve_business_prolite",
-  "self_serve_business_usage_based",
-  "business",
-  "ent26",
-  "enterprise_cbp_automation",
-  "enterprise_cbp_usage_based",
-  "enterprise",
-  "edu",
-  "edu_plus",
-  "edu_pro",
-  "unknown",
-]).annotate({ identifier: "V2GetAccountResponse__PlanType" });
+export type V2GetAccountResponse__PlanType = string;
+export const V2GetAccountResponse__PlanType = Schema.String.annotate({
+  identifier: "V2GetAccountResponse__PlanType",
+});
 
 export type V2GetAccountResponse__AccountRoutingOverride = "NO_CONSTRAINT" | "us" | "us_cr";
 export const V2GetAccountResponse__AccountRoutingOverride = Schema.Literals([
diff --git a/packages/effect-codex-app-server/src/schema.test.ts b/packages/effect-codex-app-server/src/schema.test.ts
index b12b33e02854..9f5e2c7beaf7 100644
--- a/packages/effect-codex-app-server/src/schema.test.ts
+++ b/packages/effect-codex-app-server/src/schema.test.ts
@@ -4,6 +4,10 @@ import * as Schema from "effect/Schema";
 import * as CodexSchema from "./schema.ts";
 
 const isGetAccountResponse = Schema.is(CodexSchema.V2GetAccountResponse);
+const isAccountUpdatedNotification = Schema.is(CodexSchema.V2AccountUpdatedNotification);
+const isAccountRateLimitsUpdatedNotification = Schema.is(
+  CodexSchema.V2AccountRateLimitsUpdatedNotification,
+);
 const isThreadReadResponse = Schema.is(CodexSchema.V2ThreadReadResponse);
 const isThreadResumeResponse = Schema.is(CodexSchema.V2ThreadResumeResponse);
 const isThreadForkResponse = Schema.is(CodexSchema.V2ThreadForkResponse);
@@ -201,16 +205,8 @@ it("accepts Codex misalignment policy errors for thread responses", () => {
   );
 });
 
-it("accepts Codex 0.150 account plan values", () => {
-  const planTypes = [
-    "self_serve_business_prolite",
-    "ent26",
-    "enterprise_cbp_automation",
-    "edu_plus",
-    "edu_pro",
-  ];
-
-  for (const planType of planTypes) {
+it("accepts account plans newer than the generated protocol", () => {
+  for (const planType of ["promax", "a_plan_codex_adds_later"]) {
     const accountResponse = {
       account: {
         email: "user@example.com",
@@ -221,5 +217,7 @@ it("accepts Codex 0.150 account plan values", () => {
     };
 
     assert.equal(isGetAccountResponse(accountResponse), true);
+    assert.equal(isAccountUpdatedNotification({ authMode: "chatgpt", planType }), true);
+    assert.equal(isAccountRateLimitsUpdatedNotification({ rateLimits: { planType } }), true);
   }
 });