diff --git a/codex-rs/backend-client/src/client.rs b/codex-rs/backend-client/src/client.rs
index 553532ea71..e7fe145987 100644
--- a/codex-rs/backend-client/src/client.rs
+++ b/codex-rs/backend-client/src/client.rs
@@ -477,9 +477,6 @@ impl Client {
             crate::types::PlanType::Business => AccountPlanType::Business,
             crate::types::PlanType::Enterprise => AccountPlanType::Enterprise,
             crate::types::PlanType::Edu | crate::types::PlanType::Education => AccountPlanType::Edu,
-            crate::types::PlanType::SelfServeBusinessUsage => {
-                AccountPlanType::SelfServeBusinessUsage
-            }
             crate::types::PlanType::Guest
             | crate::types::PlanType::FreeWorkspace
             | crate::types::PlanType::Quorum
diff --git a/codex-rs/codex-backend-openapi-models/src/models/rate_limit_status_payload.rs b/codex-rs/codex-backend-openapi-models/src/models/rate_limit_status_payload.rs
index 8cf54aedb2..3d0492fa83 100644
--- a/codex-rs/codex-backend-openapi-models/src/models/rate_limit_status_payload.rs
+++ b/codex-rs/codex-backend-openapi-models/src/models/rate_limit_status_payload.rs
@@ -81,6 +81,4 @@ pub enum PlanType {
     Enterprise,
     #[serde(rename = "edu")]
     Edu,
-    #[serde(rename = "self_serve_business_usage_based")]
-    SelfServeBusinessUsage,
 }
diff --git a/codex-rs/core/src/error.rs b/codex-rs/core/src/error.rs
index ac60d2c1e1..b84180d160 100644
--- a/codex-rs/core/src/error.rs
+++ b/codex-rs/core/src/error.rs
@@ -460,7 +460,9 @@ impl std::fmt::Display for UsageLimitReachedError {
                 "You've hit your usage limit.{}",
                 retry_suffix(self.resets_at.as_ref())
             ),
-            Some(PlanType::SelfServeBusinessUsage) => {
+            Some(PlanType::Unknown(plan))
+                if plan.eq_ignore_ascii_case("self_serve_business_usage_based") =>
+            {
                 match self
                     .rate_limits
                     .as_ref()
diff --git a/codex-rs/exec/src/lib.rs b/codex-rs/exec/src/lib.rs
index 7ad3e6b6f2..f648a63952 100644
--- a/codex-rs/exec/src/lib.rs
+++ b/codex-rs/exec/src/lib.rs
@@ -1397,7 +1397,6 @@ fn local_external_chatgpt_tokens(
         AccountPlanType::Business => "business".to_string(),
         AccountPlanType::Enterprise => "enterprise".to_string(),
         AccountPlanType::Edu => "edu".to_string(),
-        AccountPlanType::SelfServeBusinessUsage => "self_serve_business_usage_based".to_string(),
         AccountPlanType::Unknown => "unknown".to_string(),
     });
 
diff --git a/codex-rs/login/src/auth/manager.rs b/codex-rs/login/src/auth/manager.rs
index a3dcbd17fb..1e4cd06d3a 100644
--- a/codex-rs/login/src/auth/manager.rs
+++ b/codex-rs/login/src/auth/manager.rs
@@ -275,9 +275,6 @@ impl CodexAuth {
                 .chatgpt_plan_type
                 .map(|pt| match pt {
                     InternalPlanType::Known(k) => map_known(&k),
-                    InternalPlanType::SelfServeBusinessUsage => {
-                        AccountPlanType::SelfServeBusinessUsage
-                    }
                     InternalPlanType::Unknown(_) => AccountPlanType::Unknown,
                 })
                 .unwrap_or(AccountPlanType::Unknown)
diff --git a/codex-rs/login/src/token_data.rs b/codex-rs/login/src/token_data.rs
index 7b8b8f3316..304bf765f4 100644
--- a/codex-rs/login/src/token_data.rs
+++ b/codex-rs/login/src/token_data.rs
@@ -39,7 +39,6 @@ impl IdTokenInfo {
     pub fn get_chatgpt_plan_type(&self) -> Option<String> {
         self.chatgpt_plan_type.as_ref().map(|t| match t {
             PlanType::Known(plan) => format!("{plan:?}"),
-            PlanType::SelfServeBusinessUsage => "self_serve_business_usage_based".to_string(),
             PlanType::Unknown(s) => s.clone(),
         })
     }
@@ -49,15 +48,15 @@ impl IdTokenInfo {
             self.chatgpt_plan_type,
             Some(PlanType::Known(
                 KnownPlan::Team | KnownPlan::Business | KnownPlan::Enterprise | KnownPlan::Edu
-            ) | PlanType::SelfServeBusinessUsage)
+            ))
         )
     }
 }
 
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(untagged)]
 pub enum PlanType {
     Known(KnownPlan),
-    SelfServeBusinessUsage,
     Unknown(String),
 }
 
@@ -72,46 +71,11 @@ impl PlanType {
             "business" => Self::Known(KnownPlan::Business),
             "enterprise" => Self::Known(KnownPlan::Enterprise),
             "education" | "edu" => Self::Known(KnownPlan::Edu),
-            "self_serve_business_usage_based" => Self::SelfServeBusinessUsage,
             _ => Self::Unknown(raw.to_string()),
         }
     }
 }
 
-impl Serialize for PlanType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: serde::Serializer,
-    {
-        let value = match self {
-            Self::Known(plan) => match plan {
-                KnownPlan::Free => "free",
-                KnownPlan::Go => "go",
-                KnownPlan::Plus => "plus",
-                KnownPlan::Pro => "pro",
-                KnownPlan::Team => "team",
-                KnownPlan::Business => "business",
-                KnownPlan::Enterprise => "enterprise",
-                KnownPlan::Edu => "edu",
-            },
-            Self::SelfServeBusinessUsage => "self_serve_business_usage_based",
-            Self::Unknown(raw) => raw,
-        };
-
-        serializer.serialize_str(value)
-    }
-}
-
-impl<'de> Deserialize<'de> for PlanType {
-    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
-    where
-        D: serde::Deserializer<'de>,
-    {
-        let raw = String::deserialize(deserializer)?;
-        Ok(Self::from_raw_value(&raw))
-    }
-}
-
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 #[serde(rename_all = "lowercase")]
 pub enum KnownPlan {
diff --git a/codex-rs/protocol/src/account.rs b/codex-rs/protocol/src/account.rs
index cf1e8a189d..1cb58a020f 100644
--- a/codex-rs/protocol/src/account.rs
+++ b/codex-rs/protocol/src/account.rs
@@ -16,9 +16,6 @@ pub enum PlanType {
     Business,
     Enterprise,
     Edu,
-    #[serde(rename = "self_serve_business_usage_based")]
-    #[ts(rename = "self_serve_business_usage_based")]
-    SelfServeBusinessUsage,
     #[serde(other)]
     Unknown,
 }