diff --git a/backend/crates/providers/openai/src/admin.rs b/backend/crates/providers/openai/src/admin.rs
index 2eb3949be..15267f53a 100644
--- a/backend/crates/providers/openai/src/admin.rs
+++ b/backend/crates/providers/openai/src/admin.rs
@@ -1011,6 +1011,7 @@ struct PendingDocument {
     state: String,
     nonce: String,
     code_verifier: String,
+    installation_id: String,
     reauthorization_account_id: Option<String>,
     mutation: PendingMutationDocument,
 }
@@ -1071,6 +1072,10 @@ fn encode_pending(pending: &CodexPendingAuthorization) -> Map<String, Value> {
         "code_verifier".to_owned(),
         Value::String(pending.code_verifier().expose_secret().to_owned()),
     );
+    document.insert(
+        "installation_id".to_owned(),
+        Value::String(pending.installation_id().to_owned()),
+    );
     document.insert(
         "reauthorization_account_id".to_owned(),
         pending
@@ -1161,6 +1166,7 @@ fn decode_pending(
         state: SecretString::from(document.state),
         nonce: SecretString::from(document.nonce),
         code_verifier: SecretString::from(document.code_verifier),
+        installation_id: document.installation_id,
         reauthorization_account_id: document.reauthorization_account_id,
         mutation: decode_mutation(document.mutation)?,
     })
diff --git a/backend/crates/providers/openai/src/credential/admin.rs b/backend/crates/providers/openai/src/credential/admin.rs
index 565a9eb2e..32020dfa5 100644
--- a/backend/crates/providers/openai/src/credential/admin.rs
+++ b/backend/crates/providers/openai/src/credential/admin.rs
@@ -55,6 +55,7 @@ pub struct ImportCodexOAuthCredential {
 pub(crate) struct UnresolvedCodexOAuthCredential {
     pub(crate) account_id: String,
     pub(crate) name: String,
+    pub(crate) installation_id: String,
     pub(crate) secret: CodexOAuthSecret,
     pub(crate) metadata: CodexOAuthMetadata,
     pub(crate) access_token_expires_at: Option<DateTime<Utc>>,
@@ -68,6 +69,7 @@ impl fmt::Debug for UnresolvedCodexOAuthCredential {
             .debug_struct("UnresolvedCodexOAuthCredential")
             .field("account_id", &self.account_id)
             .field("name", &self.name)
+            .field("installation_id", &"<pseudonymous>")
             .field("secret", &"<redacted>")
             .field("metadata", &self.metadata)
             .field("access_token_expires_at", &self.access_token_expires_at)
@@ -473,8 +475,12 @@ impl CodexCredentialAdmin {
             chatgpt_account_id: upstream_account_id,
         } = input.metadata;
         let has_upstream_user_id = upstream_user_id.is_some();
-        let credential = CodexCredentialCodec::encode_unresolved(&input.secret, Vec::new())
-            .map_err(|_| CodexCredentialAdminError::InvalidCredential)?;
+        let credential = CodexCredentialCodec::encode_unresolved(
+            &input.secret,
+            input.installation_id,
+            Vec::new(),
+        )
+        .map_err(|_| CodexCredentialAdminError::InvalidCredential)?;
         let account = ProviderAccount::new(
             account_id,
             provider,
@@ -917,6 +923,7 @@ impl CodexCredentialAdminService {
                                 .or_else(|| metadata.email.clone())
                                 .filter(|name| !name.trim().is_empty())
                                 .unwrap_or_else(|| "Codex OAuth".to_owned()),
+                            installation_id: uuid::Uuid::new_v4().to_string(),
                             secret,
                             metadata,
                             access_token_expires_at,
diff --git a/backend/crates/providers/openai/src/credential/oauth.rs b/backend/crates/providers/openai/src/credential/oauth.rs
index 0f48317ac..23372e8b0 100644
--- a/backend/crates/providers/openai/src/credential/oauth.rs
+++ b/backend/crates/providers/openai/src/credential/oauth.rs
@@ -36,11 +36,16 @@ use super::token_client::{
     OFFICIAL_CODEX_OAUTH_CLIENT_ID, OFFICIAL_CODEX_REDIRECT_URI,
 };
 use super::types::parse_chatgpt_jwt_claims;
+use crate::transport::profile::CodexWireProfileState;
 
 const AUTHORIZATION_ENDPOINT: &str = "https://auth.openai.com/oauth/authorize";
+const DESKTOP_AUTH_ENDPOINT: &str = "https://chatgpt.com/codex/desktop-auth";
 const AUTHORIZATION_SCOPE: &str =
     "openid profile email offline_access api.connectors.read api.connectors.invoke";
 const AUTHORIZATION_ORIGINATOR: &str = "Codex Desktop";
+const STREAMLINED_LOGIN_QUERY: &str = "codex_streamlined_login";
+const NO_UNIVERSAL_LINKS_QUERY: &str = "no_universal_links";
+const SURFACE_STABLE_ID_DOMAIN: &[u8] = b"openai/codex-desktop/surface-stable-id/v1\0";
 const AUTHORIZATION_TTL: TimeDelta = TimeDelta::minutes(10);
 const AUTHORIZATION_CLAIM_TTL: Duration = Duration::from_secs(90);
 const MAX_CALLBACK_BYTES: usize = 16 * 1024;
@@ -139,6 +144,7 @@ pub struct CodexPendingAuthorization {
     state: SecretString,
     nonce: SecretString,
     code_verifier: SecretString,
+    installation_id: String,
     reauthorization: Option<ProviderAccountId>,
     mutation: PendingAuthorizationMutation,
 }
@@ -152,6 +158,7 @@ pub struct StoredCodexPendingAuthorization {
     pub state: SecretString,
     pub nonce: SecretString,
     pub code_verifier: SecretString,
+    pub installation_id: String,
     pub reauthorization_account_id: Option<String>,
     pub mutation: PendingAuthorizationMutation,
 }
@@ -174,6 +181,7 @@ impl CodexPendingAuthorization {
             state: input.state,
             nonce: input.nonce,
             code_verifier: input.code_verifier,
+            installation_id: input.installation_id,
             reauthorization,
             mutation: input.mutation,
         };
@@ -185,6 +193,7 @@ impl CodexPendingAuthorization {
             || !valid_secret(pending.state.expose_secret())
             || !valid_secret(pending.nonce.expose_secret())
             || !valid_secret(pending.code_verifier.expose_secret())
+            || !valid_installation_id(&pending.installation_id)
             || !pending_mutation_matches(&pending)
         {
             return Err(CodexOAuthPendingStoreError::InvalidValue);
@@ -232,6 +241,11 @@ impl CodexPendingAuthorization {
         &self.code_verifier
     }
 
+    #[must_use]
+    pub fn installation_id(&self) -> &str {
+        &self.installation_id
+    }
+
     #[must_use]
     pub const fn reauthorization(&self) -> Option<&ProviderAccountId> {
         self.reauthorization.as_ref()
@@ -255,6 +269,7 @@ impl fmt::Debug for CodexPendingAuthorization {
             .field("state", &"<redacted>")
             .field("nonce", &"<redacted>")
             .field("code_verifier", &"<redacted>")
+            .field("installation_id", &"<pseudonymous>")
             .field("reauthorization", &self.reauthorization)
             .field("mutation", &self.mutation)
             .finish()
@@ -350,6 +365,7 @@ pub struct CodexOAuthAdminService {
     store: Arc<dyn ProviderAccountStore>,
     credentials: CodexCredentialAdmin,
     oauth_client_id: String,
+    profile: CodexWireProfileState,
 }
 
 struct CodexOAuthAuthorizationCommitGuard {
@@ -399,6 +415,7 @@ impl CodexOAuthAdminService {
         exchanger: Arc<dyn AuthorizationCodeExchanger>,
         store: Arc<dyn ProviderAccountStore>,
         credentials: CodexCredentialAdmin,
+        profile: CodexWireProfileState,
     ) -> Self {
         Self {
             pending,
@@ -406,6 +423,7 @@ impl CodexOAuthAdminService {
             store,
             credentials,
             oauth_client_id: OFFICIAL_CODEX_OAUTH_CLIENT_ID.to_owned(),
+            profile,
         }
     }
 
@@ -422,8 +440,10 @@ impl CodexOAuthAdmin for CodexOAuthAdminService {
         &self,
         command: StartCodexOAuthAuthorization,
     ) -> Result<CodexOAuthAuthorizationStarted, CodexOAuthAdminError> {
-        let (name, reauthorization) = match command.mutation.target() {
-            AuthorizationMutationTarget::Create { name } => (name.clone(), None),
+        let (name, reauthorization, installation_id) = match command.mutation.target() {
+            AuthorizationMutationTarget::Create { name } => {
+                (name.clone(), None, Uuid::new_v4().to_string())
+            }
             AuthorizationMutationTarget::Reauthorize { account_id } => {
                 let current = self
                     .store
@@ -435,10 +455,15 @@ impl CodexOAuthAdmin for CodexOAuthAdminService {
                 {
                     return Err(CodexOAuthAdminError::NotFound);
                 }
-                (current.account.name().to_owned(), Some(account_id.clone()))
+                let installation_id = current_installation_id(&current)?;
+                (
+                    current.account.name().to_owned(),
+                    Some(account_id.clone()),
+                    installation_id,
+                )
             }
         };
-        self.start_pending(command.mutation, name, reauthorization)
+        self.start_pending(command.mutation, name, reauthorization, installation_id)
             .await
     }
 
@@ -490,6 +515,9 @@ impl CodexOAuthAdminService {
                 .load_current_credential(target)
                 .await
                 .map_err(map_store_error)?;
+            if current_installation_id(&current)? != pending.installation_id() {
+                return Err(CodexOAuthAdminError::Conflict);
+            }
             Some(current)
         } else {
             None
@@ -527,6 +555,7 @@ impl CodexOAuthAdminService {
                     .prepare_unresolved_oauth(UnresolvedCodexOAuthCredential {
                         account_id,
                         name: pending.name,
+                        installation_id: pending.installation_id,
                         secret,
                         metadata,
                         access_token_expires_at,
@@ -546,6 +575,7 @@ impl CodexOAuthAdminService {
         mutation: PendingAuthorizationMutation,
         name: String,
         reauthorization: Option<ProviderAccountId>,
+        installation_id: String,
     ) -> Result<CodexOAuthAuthorizationStarted, CodexOAuthAdminError> {
         if !valid_text(&name) {
             return Err(CodexOAuthAdminError::InvalidInput);
@@ -564,17 +594,21 @@ impl CodexOAuthAdminService {
             state: SecretString::from(random_secret()?),
             nonce: SecretString::from(random_secret()?),
             code_verifier: SecretString::from(random_secret()?),
+            installation_id,
             reauthorization_account_id: reauthorization.as_ref().map(ToString::to_string),
             mutation,
         })
         .map_err(map_pending_error)?;
+        let profile = self.profile.snapshot();
+        let authorization_url =
+            authorization_url(&pending, &self.oauth_client_id, &profile.desktop_version)?;
         self.pending
             .create(&pending)
             .await
             .map_err(map_pending_error)?;
         Ok(CodexOAuthAuthorizationStarted {
             flow_id: pending.flow_id.clone(),
-            authorization_url: authorization_url(&pending, &self.oauth_client_id)?,
+            authorization_url,
             expires_at,
         })
     }
@@ -690,31 +724,70 @@ fn current_oauth_refresh_token(
         .and_then(|oauth| oauth.refresh_token.clone()))
 }
 
+fn current_installation_id(current: &LoadedCredential) -> Result<String, CodexOAuthAdminError> {
+    let runtime = CodexCredentialCodec::decode(&current.credential)
+        .map_err(|_| CodexOAuthAdminError::Credential)?;
+    if runtime.authentication.oauth().is_none() {
+        return Err(CodexOAuthAdminError::Credential);
+    }
+    Ok(runtime.installation_id)
+}
+
+fn derive_surface_stable_id(installation_id: &str) -> Result<String, CodexOAuthAdminError> {
+    let installation_id =
+        Uuid::parse_str(installation_id).map_err(|_| CodexOAuthAdminError::Credential)?;
+    let mut digest = Sha256::new();
+    digest.update(SURFACE_STABLE_ID_DOMAIN);
+    digest.update(installation_id.as_bytes());
+    let digest = digest.finalize();
+    let mut bytes = [0_u8; 16];
+    bytes.copy_from_slice(&digest[..16]);
+    bytes[6] = (bytes[6] & 0x0f) | 0x40;
+    bytes[8] = (bytes[8] & 0x3f) | 0x80;
+    Ok(Uuid::from_bytes(bytes).hyphenated().to_string())
+}
+
 fn authorization_url(
     pending: &CodexPendingAuthorization,
     oauth_client_id: &str,
+    desktop_version: &str,
 ) -> Result<String, CodexOAuthAdminError> {
-    let mut url =
+    if !valid_text(desktop_version) {
+        return Err(CodexOAuthAdminError::InvalidInput);
+    }
+    let mut inner =
         Url::parse(AUTHORIZATION_ENDPOINT).map_err(|_| CodexOAuthAdminError::InvalidInput)?;
     let challenge = URL_SAFE_NO_PAD.encode(Sha256::digest(
         pending.code_verifier.expose_secret().as_bytes(),
     ));
-    let query = [
-        ("response_type", "code"),
-        ("client_id", oauth_client_id),
-        ("redirect_uri", OFFICIAL_CODEX_REDIRECT_URI),
-        ("scope", AUTHORIZATION_SCOPE),
-        ("code_challenge", challenge.as_str()),
-        ("code_challenge_method", "S256"),
-        ("id_token_add_organizations", "true"),
-        ("codex_cli_simplified_flow", "true"),
-        ("state", pending.state.expose_secret()),
-        ("originator", AUTHORIZATION_ORIGINATOR),
-    ]
-    .map(|(name, value)| format!("{name}={}", urlencoding::encode(value)))
-    .join("&");
-    url.set_query(Some(&query));
-    Ok(url.into())
+    let stable_id = derive_surface_stable_id(pending.installation_id())?;
+    {
+        let mut query = inner.query_pairs_mut();
+        query
+            .append_pair("response_type", "code")
+            .append_pair("client_id", oauth_client_id)
+            .append_pair("redirect_uri", OFFICIAL_CODEX_REDIRECT_URI)
+            .append_pair("scope", AUTHORIZATION_SCOPE)
+            .append_pair("code_challenge", challenge.as_str())
+            .append_pair("code_challenge_method", "S256")
+            .append_pair("id_token_add_organizations", "true")
+            .append_pair("codex_cli_simplified_flow", "true")
+            .append_pair("state", pending.state.expose_secret())
+            .append_pair("originator", AUTHORIZATION_ORIGINATOR)
+            .append_pair("codex_app_version", desktop_version)
+            .append_pair("source_surface_stable_id", &stable_id)
+            .append_pair("codex_origin_stable_id", &stable_id)
+            .append_pair(STREAMLINED_LOGIN_QUERY, "true");
+    }
+
+    let mut outer =
+        Url::parse(DESKTOP_AUTH_ENDPOINT).map_err(|_| CodexOAuthAdminError::InvalidInput)?;
+    outer
+        .query_pairs_mut()
+        .append_pair("authorize_url", inner.as_str())
+        .append_pair(STREAMLINED_LOGIN_QUERY, "true")
+        .append_pair(NO_UNIVERSAL_LINKS_QUERY, "1");
+    Ok(outer.into())
 }
 
 fn callback_parts(value: &str) -> Result<(SecretString, SecretString), CodexOAuthAdminError> {
@@ -766,6 +839,12 @@ fn valid_secret(value: &str) -> bool {
     valid_text(value) && value.len() >= 16
 }
 
+fn valid_installation_id(value: &str) -> bool {
+    Uuid::parse_str(value)
+        .ok()
+        .is_some_and(|uuid| uuid.get_version_num() == 4)
+}
+
 pub(crate) fn oauth_owner_ref(owner: &AuthorizationOwner) -> String {
     let mut digest = Sha256::new();
     match owner {
diff --git a/backend/crates/providers/openai/src/credential/security.rs b/backend/crates/providers/openai/src/credential/security.rs
index 9805f1dd7..4f9b28389 100644
--- a/backend/crates/providers/openai/src/credential/security.rs
+++ b/backend/crates/providers/openai/src/credential/security.rs
@@ -108,6 +108,7 @@ impl CodexCredentialCodec {
                 oauth_subject: account.oauth_subject.clone(),
                 poid: account.poid.clone(),
             }),
+            uuid::Uuid::new_v4().to_string(),
             cookies,
         )
     }
@@ -115,20 +116,22 @@ impl CodexCredentialCodec {
     /// 为尚未解析资料的 OAuth 账号编码凭据。
     pub(crate) fn encode_unresolved(
         secret: &CodexOAuthSecret,
+        installation_id: String,
         cookies: Vec<CodexCookie>,
     ) -> Result<PlaintextCredential, CodexCredentialDataError> {
-        Self::encode_oauth(secret, None, cookies)
+        Self::encode_oauth(secret, None, installation_id, cookies)
     }
 
     fn encode_oauth(
         secret: &CodexOAuthSecret,
         principal: Option<CodexCredentialPrincipal>,
+        installation_id: String,
         cookies: Vec<CodexCookie>,
     ) -> Result<PlaintextCredential, CodexCredentialDataError> {
         Self::encode_complete(CodexCredentialData::OAuth(CodexOAuthCredentialData {
             schema_version: CODEX_CREDENTIAL_SCHEMA_VERSION,
             principal,
-            installation_id: uuid::Uuid::new_v4().to_string(),
+            installation_id,
             access_token: secret.access_token.expose_secret().to_owned(),
             refresh_token: secret
                 .refresh_token
diff --git a/backend/crates/providers/openai/src/lib.rs b/backend/crates/providers/openai/src/lib.rs
index 2d65dd2a2..ce53c64e6 100644
--- a/backend/crates/providers/openai/src/lib.rs
+++ b/backend/crates/providers/openai/src/lib.rs
@@ -176,6 +176,7 @@ pub async fn initialize(
             exchanger,
             Arc::clone(&accounts),
             CodexCredentialAdmin,
+            profile.clone(),
         )
         .with_oauth_client_id(config.oauth_client_id()),
     );
diff --git a/backend/crates/providers/openai/tests/admin.rs b/backend/crates/providers/openai/tests/admin.rs
index 688897230..c7977cbf9 100644
--- a/backend/crates/providers/openai/tests/admin.rs
+++ b/backend/crates/providers/openai/tests/admin.rs
@@ -33,7 +33,7 @@ use gateway_core::provider_ports::{
 use gateway_core::routing::{ProviderKind, UpstreamModelId};
 use gateway_core::task::{WorkerContribution, WorkerKind, WorkerRunnable};
 use provider_openai::config::{CodexWireProfileConfig, OpenAiConfig};
-use provider_openai::credential::ImportCodexOAuthCredential;
+use provider_openai::credential::{CodexCredentialCodec, ImportCodexOAuthCredential};
 use provider_openai::transport::profile::APPCAST_POLL_INTERVAL;
 use secrecy::SecretString;
 use serde_json::{Map, Value, json};
@@ -233,6 +233,14 @@ async fn openai_admin_provider_persists_the_full_pending_envelope_and_binds_owne
                 .get("reauthorization_credential_revision")
                 .is_none()
         );
+        assert!(
+            payload
+                .expose_to_provider()
+                .get("installation_id")
+                .and_then(Value::as_str)
+                .and_then(|value| uuid::Uuid::parse_str(value).ok())
+                .is_some_and(|value| value.get_version_num() == 4)
+        );
         assert_eq!(
             mutation.get("schema_version").and_then(Value::as_u64),
             Some(3)
@@ -268,7 +276,7 @@ async fn openai_admin_provider_persists_the_full_pending_envelope_and_binds_owne
 }
 
 #[tokio::test]
-async fn openai_reauthorization_pending_payload_contains_only_stable_account_identity() {
+async fn openai_reauthorization_pending_payload_reuses_the_account_installation_id() {
     let accounts = Arc::new(MemoryAccountStore::default());
     accounts
         .seed_oauth_credential(ImportCodexOAuthCredential {
@@ -280,6 +288,14 @@ async fn openai_reauthorization_pending_payload_contains_only_stable_account_ide
             enabled: true,
         })
         .await;
+    let account_id = ProviderAccountId::new("acct_pending_reauth").expect("account id");
+    let existing = accounts
+        .load_current_credential(&account_id)
+        .await
+        .expect("seeded credential");
+    let expected_installation_id = CodexCredentialCodec::decode(&existing.credential)
+        .expect("decode seeded credential")
+        .installation_id;
     let pending = Arc::new(TestOAuthPending::default());
     let config = valid_config();
     let bundle = provider_openai::initialize(
@@ -297,9 +313,7 @@ async fn openai_reauthorization_pending_payload_contains_only_stable_account_ide
         .admin_provider()
         .start_authorization(PendingAuthorizationMutation::new(
             ProviderKind::new("openai").expect("provider"),
-            AuthorizationMutationTarget::Reauthorize {
-                account_id: ProviderAccountId::new("acct_pending_reauth").expect("account id"),
-            },
+            AuthorizationMutationTarget::Reauthorize { account_id },
             AuthorizationOwnerBinding::from_context(&context),
         ))
         .await
@@ -326,6 +340,10 @@ async fn openai_reauthorization_pending_payload_contains_only_stable_account_ide
             .and_then(Value::as_str),
         Some("acct_pending_reauth")
     );
+    assert_eq!(
+        document.get("installation_id").and_then(Value::as_str),
+        Some(expected_installation_id.as_str())
+    );
     assert!(
         document
             .get("reauthorization_credential_revision")
diff --git a/backend/crates/providers/openai/tests/credential/oauth.rs b/backend/crates/providers/openai/tests/credential/oauth.rs
index bfb50beed..f3bb75c23 100644
--- a/backend/crates/providers/openai/tests/credential/oauth.rs
+++ b/backend/crates/providers/openai/tests/credential/oauth.rs
@@ -8,22 +8,26 @@ use gateway_admin::model::provider_credentials::{
     AuthorizationMutationTarget, AuthorizationOwnerBinding, PendingAuthorizationMutation,
 };
 use gateway_admin::model::{MutationActor, MutationContext};
-use gateway_core::engine::credential::AccountStatus;
+use gateway_core::engine::credential::{AccountStatus, ProviderAccountId};
 use gateway_core::routing::ProviderKind;
+use provider_openai::OpenAiConfig;
 use provider_openai::credential::token_client::{
     AuthorizationCodeExchangeError, AuthorizationCodeExchanger, AuthorizationCodeGrant,
     AuthorizationTokenSet,
 };
 use provider_openai::credential::{
-    CodexCredentialAdmin, CodexOAuthAdmin, CodexOAuthAdminError, CodexOAuthAdminService,
-    CodexOAuthPendingClaimOutcome, CodexOAuthPendingStore, CodexOAuthPendingStoreError,
-    CodexOAuthSecret, CompleteCodexOAuthAuthorization, CompletedCodexOAuthCredential,
-    StartCodexOAuthAuthorization, StoredCodexPendingAuthorization,
+    CodexCredentialAdmin, CodexCredentialCodec, CodexOAuthAdmin, CodexOAuthAdminError,
+    CodexOAuthAdminService, CodexOAuthPendingClaimOutcome, CodexOAuthPendingStore,
+    CodexOAuthPendingStoreError, CodexOAuthSecret, CompleteCodexOAuthAuthorization,
+    CompletedCodexOAuthCredential, ImportCodexOAuthCredential, StartCodexOAuthAuthorization,
+    StoredCodexPendingAuthorization,
 };
+use provider_openai::transport::profile::CodexWireProfileState;
 use secrecy::SecretString;
 use url::Url;
+use uuid::Uuid;
 
-use crate::support::MemoryAccountStore;
+use crate::support::{MemoryAccountStore, profile as account_profile, secret};
 
 #[derive(Default)]
 struct PendingStore {
@@ -49,6 +53,7 @@ impl CodexOAuthPendingStore for PendingStore {
             state: pending.state().clone(),
             nonce: pending.nonce().clone(),
             code_verifier: pending.code_verifier().clone(),
+            installation_id: pending.installation_id().to_owned(),
             reauthorization_account_id: pending.reauthorization().map(ToString::to_string),
             mutation: pending.mutation().clone(),
         });
@@ -126,18 +131,37 @@ fn mutation() -> PendingAuthorizationMutation {
     )
 }
 
+fn reauthorization_mutation(
+    account_id: ProviderAccountId,
+    request_id: &str,
+) -> PendingAuthorizationMutation {
+    let context = MutationContext {
+        actor: MutationActor::System,
+        request_id: request_id.to_owned(),
+    };
+    PendingAuthorizationMutation::new(
+        ProviderKind::new("openai").expect("provider"),
+        AuthorizationMutationTarget::Reauthorize { account_id },
+        AuthorizationOwnerBinding::from_context(&context),
+    )
+}
+
 fn id_token(payload: serde_json::Value) -> String {
     let payload = URL_SAFE_NO_PAD.encode(serde_json::to_vec(&payload).expect("payload JSON"));
     // 官方逻辑只读取 payload；header/signature 不参与本地 metadata 解析。
     format!("unverified-header.{payload}.unverified-signature")
 }
 
-async fn complete(id_token: String) -> Result<CompletedCodexOAuthCredential, CodexOAuthAdminError> {
+async fn complete(
+    id_token: String,
+) -> Result<(CompletedCodexOAuthCredential, String, String), CodexOAuthAdminError> {
+    let pending_store = Arc::new(PendingStore::default());
     let service = CodexOAuthAdminService::new(
-        Arc::new(PendingStore::default()),
+        pending_store.clone(),
         Arc::new(Exchanger { id_token }),
         Arc::new(MemoryAccountStore::default()),
         CodexCredentialAdmin,
+        profile(),
     );
     let started = service
         .start_authorization(StartCodexOAuthAuthorization {
@@ -145,11 +169,26 @@ async fn complete(id_token: String) -> Result<CompletedCodexOAuthCredential, Cod
         })
         .await
         .expect("start OAuth authorization");
-    let state = Url::parse(&started.authorization_url)
-        .expect("authorization URL")
+    let outer = Url::parse(&started.authorization_url).expect("authorization URL");
+    let inner_url = outer
         .query_pairs()
-        .find_map(|(key, value)| (key == "state").then(|| value.into_owned()))
-        .expect("state parameter");
+        .find_map(|(key, value)| (key == "authorize_url").then(|| value.into_owned()))
+        .expect("inner authorization URL");
+    let inner = Url::parse(&inner_url).expect("authorization URL");
+    let parameters = inner.query_pairs().into_owned().collect::<BTreeMap<_, _>>();
+    let state = parameters.get("state").expect("state parameter");
+    let surface_stable_id = parameters
+        .get("source_surface_stable_id")
+        .expect("surface stable ID")
+        .to_owned();
+    let installation_id = pending_store
+        .pending
+        .lock()
+        .expect("pending lock")
+        .as_ref()
+        .expect("stored pending authorization")
+        .installation_id
+        .clone();
     let completed = service
         .complete_authorization(CompleteCodexOAuthAuthorization {
             owner_ref: "test-owner".to_owned(),
@@ -159,7 +198,7 @@ async fn complete(id_token: String) -> Result<CompletedCodexOAuthCredential, Cod
             )),
         })
         .await?;
-    Ok(completed.credential)
+    Ok((completed.credential, installation_id, surface_stable_id))
 }
 
 #[tokio::test]
@@ -171,6 +210,7 @@ async fn authorize_url_matches_the_official_desktop_parameter_contract() {
         }),
         Arc::new(MemoryAccountStore::default()),
         CodexCredentialAdmin,
+        profile(),
     );
     let started = service
         .start_authorization(StartCodexOAuthAuthorization {
@@ -179,7 +219,43 @@ async fn authorize_url_matches_the_official_desktop_parameter_contract() {
         .await
         .expect("start OAuth authorization");
     let url = Url::parse(&started.authorization_url).expect("authorization URL");
-    let ordered_parameters = url.query_pairs().into_owned().collect::<Vec<_>>();
+    let outer_parameters = url.query_pairs().into_owned().collect::<Vec<_>>();
+    assert_eq!(
+        outer_parameters
+            .iter()
+            .map(|(name, _)| name.as_str())
+            .collect::<Vec<_>>(),
+        vec![
+            "authorize_url",
+            "codex_streamlined_login",
+            "no_universal_links"
+        ]
+    );
+    let outer_parameters = outer_parameters.into_iter().collect::<BTreeMap<_, _>>();
+
+    assert_eq!(url.scheme(), "https");
+    assert_eq!(url.host_str(), Some("chatgpt.com"));
+    assert_eq!(url.path(), "/codex/desktop-auth");
+    assert_eq!(outer_parameters.len(), 3);
+    assert_eq!(
+        outer_parameters
+            .get("codex_streamlined_login")
+            .map(String::as_str),
+        Some("true")
+    );
+    assert_eq!(
+        outer_parameters
+            .get("no_universal_links")
+            .map(String::as_str),
+        Some("1")
+    );
+    let inner = Url::parse(
+        outer_parameters
+            .get("authorize_url")
+            .expect("authorize_url parameter"),
+    )
+    .expect("inner authorization URL");
+    let ordered_parameters = inner.query_pairs().into_owned().collect::<Vec<_>>();
     assert_eq!(
         ordered_parameters
             .iter()
@@ -196,19 +272,27 @@ async fn authorize_url_matches_the_official_desktop_parameter_contract() {
             "codex_cli_simplified_flow",
             "state",
             "originator",
+            "codex_app_version",
+            "source_surface_stable_id",
+            "codex_origin_stable_id",
+            "codex_streamlined_login",
         ]
     );
     let parameters = ordered_parameters.into_iter().collect::<BTreeMap<_, _>>();
 
-    assert_eq!(url.scheme(), "https");
-    assert_eq!(url.host_str(), Some("auth.openai.com"));
-    assert_eq!(url.path(), "/oauth/authorize");
-    assert_eq!(parameters.len(), 10);
+    assert_eq!(inner.host_str(), Some("auth.openai.com"));
+    assert_eq!(inner.path(), "/oauth/authorize");
+    assert_eq!(parameters.len(), 14);
     assert!(
-        url.query()
-            .is_some_and(|query| query.contains("scope=openid%20profile%20email%20offline_access"))
+        inner
+            .query()
+            .is_some_and(|query| query.contains("scope=openid+profile+email+offline_access"))
+    );
+    assert!(
+        !inner
+            .query()
+            .is_some_and(|query| query.contains("scope=openid%20profile"))
     );
-    assert!(!url.query().is_some_and(|query| query.contains('+')));
     assert_eq!(
         parameters.get("response_type").map(String::as_str),
         Some("code")
@@ -225,6 +309,25 @@ async fn authorize_url_matches_the_official_desktop_parameter_contract() {
         parameters.get("originator").map(String::as_str),
         Some("Codex Desktop")
     );
+    assert_eq!(
+        parameters.get("codex_app_version").map(String::as_str),
+        Some("26.803.81509")
+    );
+    let surface_stable_id = parameters
+        .get("source_surface_stable_id")
+        .expect("surface stable ID");
+    let parsed_surface_id = Uuid::parse_str(surface_stable_id).expect("UUID surface stable ID");
+    assert_eq!(parsed_surface_id.get_version_num(), 4);
+    assert_eq!(
+        parameters.get("codex_origin_stable_id"),
+        Some(surface_stable_id)
+    );
+    assert_eq!(
+        parameters
+            .get("codex_streamlined_login")
+            .map(String::as_str),
+        Some("true")
+    );
     assert_eq!(
         parameters.get("code_challenge_method").map(String::as_str),
         Some("S256")
@@ -259,9 +362,115 @@ async fn authorize_url_matches_the_official_desktop_parameter_contract() {
     assert!(!parameters.contains_key("nonce"));
 }
 
+fn profile() -> CodexWireProfileState {
+    OpenAiConfig::default().wire_profile_state()
+}
+
+#[tokio::test]
+async fn separate_new_authorizations_use_distinct_surface_stable_ids() {
+    let mut ids = Vec::new();
+    for _ in 0..2 {
+        let service = CodexOAuthAdminService::new(
+            Arc::new(PendingStore::default()),
+            Arc::new(Exchanger {
+                id_token: "unused".to_owned(),
+            }),
+            Arc::new(MemoryAccountStore::default()),
+            CodexCredentialAdmin,
+            profile(),
+        );
+        let started = service
+            .start_authorization(StartCodexOAuthAuthorization {
+                mutation: mutation(),
+            })
+            .await
+            .expect("start OAuth authorization");
+        let outer = Url::parse(&started.authorization_url).expect("outer authorization URL");
+        let inner = outer
+            .query_pairs()
+            .find_map(|(key, value)| (key == "authorize_url").then(|| value.into_owned()))
+            .and_then(|value| Url::parse(&value).ok())
+            .expect("inner authorization URL");
+        let surface_stable_id = inner
+            .query_pairs()
+            .find_map(|(key, value)| {
+                (key == "source_surface_stable_id").then(|| value.into_owned())
+            })
+            .expect("surface stable ID");
+        ids.push(surface_stable_id);
+    }
+    assert_ne!(ids[0], ids[1]);
+}
+
+#[tokio::test]
+async fn repeated_reauthorization_derives_the_same_surface_id_for_one_account() {
+    let store = Arc::new(MemoryAccountStore::default());
+    store
+        .seed_oauth_credential(ImportCodexOAuthCredential {
+            account_id: "acct_surface_reauth".to_owned(),
+            name: "surface reauthorization".to_owned(),
+            secret: secret("surface-reauth-access"),
+            verified_account: account_profile("chatgpt-surface-reauth"),
+            next_refresh_at: None,
+            enabled: true,
+        })
+        .await;
+    let account_id = ProviderAccountId::new("acct_surface_reauth").expect("account id");
+    let mut surface_ids = Vec::new();
+    for request_id in ["surface-reauth-first", "surface-reauth-second"] {
+        let service = CodexOAuthAdminService::new(
+            Arc::new(PendingStore::default()),
+            Arc::new(Exchanger {
+                id_token: "unused".to_owned(),
+            }),
+            store.clone(),
+            CodexCredentialAdmin,
+            profile(),
+        );
+        let started = service
+            .start_authorization(StartCodexOAuthAuthorization {
+                mutation: reauthorization_mutation(account_id.clone(), request_id),
+            })
+            .await
+            .expect("start OAuth reauthorization");
+        let outer = Url::parse(&started.authorization_url).expect("outer authorization URL");
+        let inner = outer
+            .query_pairs()
+            .find_map(|(key, value)| (key == "authorize_url").then(|| value.into_owned()))
+            .and_then(|value| Url::parse(&value).ok())
+            .expect("inner authorization URL");
+        surface_ids.push(
+            inner
+                .query_pairs()
+                .find_map(|(key, value)| {
+                    (key == "source_surface_stable_id").then(|| value.into_owned())
+                })
+                .expect("surface stable ID"),
+        );
+    }
+
+    assert_eq!(surface_ids[0], surface_ids[1]);
+}
+
+#[tokio::test]
+async fn first_exchange_persists_the_installation_id_without_reusing_it_as_the_surface_id() {
+    let (credential, pending_installation_id, surface_stable_id) = complete(id_token(
+        serde_json::json!({ "email": "identity@example.com" }),
+    ))
+    .await
+    .expect("completed OAuth exchange");
+    let CompletedCodexOAuthCredential::Create(account) = credential else {
+        panic!("expected account creation");
+    };
+    let runtime = CodexCredentialCodec::decode(&account.credential).expect("stored credential");
+
+    assert_eq!(runtime.installation_id, pending_installation_id);
+    assert_ne!(runtime.installation_id, surface_stable_id);
+}
+
 #[tokio::test]
 async fn first_exchange_uses_official_id_token_claim_mapping_without_signature_validation() {
-    let credential = complete(id_token(serde_json::json!({
+    let (credential, _, _) = complete(id_token(serde_json::json!({
         "email": "top@example.com",
         "https://api.openai.com/profile": { "email": "fallback@example.com" },
         "https://api.openai.com/auth": {
@@ -296,7 +505,7 @@ async fn first_exchange_uses_official_id_token_claim_mapping_without_signature_v
 
 #[tokio::test]
 async fn first_exchange_permits_missing_identity_claims_but_requires_a_parseable_id_token() {
-    let credential = complete(id_token(serde_json::json!({
+    let (credential, _, _) = complete(id_token(serde_json::json!({
         "https://api.openai.com/profile": { "email": "profile@example.com" }
     })))
     .await
diff --git a/docs/architecture.md b/docs/architecture.md
index c94369997..c853b7cbd 100644
--- a/docs/architecture.md
+++ b/docs/architecture.md
@@ -148,7 +148,16 @@ OpenAI OAuth 导入先取得 access token（仅有 refresh token 时先交换）
 由 `accessToken` 补齐。解析器只读取 `email`、`https://api.openai.com/profile` 与
 `https://api.openai.com/auth` 中的官方 claims，不调用 `whoami`，也不使用导入文档顶层的
 `userId/accountId` 补身份。两个令牌都没有用户身份 claims 时，账号以未验证错误状态入库。首次 OAuth
-在服务端 `state`、PKCE 与官方 token exchange 成功后解析并保存同一 token set。重新授权的目标绑定
+返回与当前 Codex Desktop 一致的两层登录地址：内层使用 `auth.openai.com/oauth/authorize` 的
+官方参数顺序，外层使用 `https://chatgpt.com/codex/desktop-auth` 并开启
+`codex_streamlined_login`。`codex_app_version` 每次从共享 Desktop 画像快照读取；
+首次授权在 10 分钟 pending flow 中生成账号级 `installation_id`，换码成功后把同一个值写入 credential。
+`source_surface_stable_id` 与 `codex_origin_stable_id` 由该 ID 经过带版本域的 SHA-256 确定性派生，并映射为
+UUIDv4；重新授权读取既有 `installation_id`，因此得到相同的 surface ID。系统不额外持久化 surface ID，
+也不再从全局 HMAC 身份锚点派生；它不等同于 DeviceCheck attestation。为了对齐 macOS Desktop
+交给外部浏览器的最终 `chatgpt.com` URL，Provider 同样携带 `no_universal_links=1` 浏览器路由参数。
+服务端随后仍以 `state`、PKCE
+与官方 token exchange 成功后解析并保存同一 token set。重新授权的目标绑定
 只保存目标账号 ID，不接受或冻结客户端提供的 credential revision；complete 阶段重新读取目标账号及其当前 revision，并以当前 revision 做最终 CAS。
 重新授权和手工或后台 RT refresh 只轮换目标账号的 token，保留既有账号资料与 OAuth principal。