diff --git a/FirebaseAuth/CHANGELOG.md b/FirebaseAuth/CHANGELOG.md
index 9c6bc4e9c9c..4263cf06d7e 100644
--- a/FirebaseAuth/CHANGELOG.md
+++ b/FirebaseAuth/CHANGELOG.md
@@ -1,6 +1,9 @@
 # Unreleased
 - [removed] **Breaking Change**: Removed
   `ActionCodeSettings.dynamicLinkDomain`.
+- [removed] **Breaking Change**: Remove deprecated Swift APIs using
+  `String`-typed `productID`s that were  in favor of API that leverages the
+  `AuthProviderID` enum. Note, this only affects Swift clients.
 
 # 11.15.0
 - [fixed] Fixed `Sendable` warnings introduced in the Xcode 26 beta. (#14996)
diff --git a/FirebaseAuth/Sources/Swift/AuthProvider/OAuthProvider.swift b/FirebaseAuth/Sources/Swift/AuthProvider/OAuthProvider.swift
index b8cca1f5fca..761f57cf5d1 100644
--- a/FirebaseAuth/Sources/Swift/AuthProvider/OAuthProvider.swift
+++ b/FirebaseAuth/Sources/Swift/AuthProvider/OAuthProvider.swift
@@ -34,13 +34,7 @@ import Foundation
   ///   - providerID: The provider ID of the IDP for which this auth provider instance will be
   /// configured.
   /// - Returns: An instance of OAuthProvider corresponding to the specified provider ID.
-  #if !FIREBASE_CI
-    @available(
-      swift,
-      deprecated: 0.01,
-      message: "Use `provider(providerID: AuthProviderID) -> OAuthProvider` instead."
-    )
-  #endif // !FIREBASE_CI
+  @available(swift 1000.0) // Objective-C only API
   @objc(providerWithProviderID:) open class func provider(providerID: String) -> OAuthProvider {
     return OAuthProvider(providerID: providerID, auth: Auth.auth())
   }
@@ -60,13 +54,7 @@ import Foundation
   /// configured.
   ///   - auth: The auth instance to be associated with the OAuthProvider instance.
   /// - Returns: An instance of OAuthProvider corresponding to the specified provider ID.
-  #if !FIREBASE_CI
-    @available(
-      swift,
-      deprecated: 0.01,
-      message: "Use `provider(providerID: AuthProviderID, auth: Auth) -> OAuthProvider` instead."
-    )
-  #endif // !FIREBASE_CI
+  @available(swift 1000.0) // Objective-C only API
   @objc(providerWithProviderID:auth:) open class func provider(providerID: String,
                                                                auth: Auth) -> OAuthProvider {
     return OAuthProvider(providerID: providerID, auth: auth)
@@ -136,13 +124,7 @@ import Foundation
   /// - Parameter accessToken: The access token associated with the Auth credential be created, if
   /// available.
   /// - Returns: An AuthCredential for the specified provider ID, ID token and access token.
-  #if !FIREBASE_CI
-    @available(
-      swift,
-      deprecated: 0.01,
-      message: "Use `credential(providerID: AuthProviderID, idToken: String, accessToken: String? = nil) -> OAuthCredential` instead."
-    )
-  #endif // !FIREBASE_CI
+  @available(swift 1000.0) // Objective-C only API
   @objc(credentialWithProviderID:IDToken:accessToken:)
   public static func credential(withProviderID providerID: String,
                                 idToken: String,
@@ -173,13 +155,7 @@ import Foundation
   /// - Parameter accessToken: The access token associated with the Auth credential be created, if
   /// available.
   /// - Returns: An AuthCredential for the specified provider ID, ID token and access token.
-  #if !FIREBASE_CI
-    @available(
-      swift,
-      deprecated: 0.01,
-      message: "Use `credential(providerID: AuthProviderID, accessToken: String) -> OAuthCredential` instead."
-    )
-  #endif // !FIREBASE_CI
+  @available(swift 1000.0) // Objective-C only API
   @objc(credentialWithProviderID:accessToken:)
   public static func credential(withProviderID providerID: String,
                                 accessToken: String) -> OAuthCredential {
@@ -203,13 +179,7 @@ import Foundation
   /// - Parameter rawNonce: The raw nonce associated with the Auth credential being created.
   /// - Parameter accessToken: The access token associated with the Auth credential be created.
   /// - Returns: An AuthCredential for the specified provider ID, ID token and access token.
-  #if !FIREBASE_CI
-    @available(
-      swift,
-      deprecated: 0.01,
-      message: "Use `credential(providerID: AuthProviderID, idToken: String, rawNonce: String, accessToken: String? = nil) -> OAuthCredential` instead."
-    )
-  #endif // !FIREBASE_CI
+  @available(swift 1000.0) // Objective-C only API
   @objc(credentialWithProviderID:IDToken:rawNonce:accessToken:)
   public static func credential(withProviderID providerID: String, idToken: String,
                                 rawNonce: String,
@@ -228,13 +198,7 @@ import Foundation
   /// - Parameter idToken: The IDToken associated with the Auth credential being created.
   /// - Parameter rawNonce: The raw nonce associated with the Auth credential being created.
   /// - Returns: An AuthCredential.
-  #if !FIREBASE_CI
-    @available(
-      swift,
-      deprecated: 0.01,
-      message: "Use `credential(providerID: AuthProviderID, idToken: String, rawNonce: String, accessToken: String? = nil) -> OAuthCredential` instead."
-    )
-  #endif // !FIREBASE_CI
+  @available(swift 1000.0) // Objective-C only API
   @objc(credentialWithProviderID:IDToken:rawNonce:)
   public static func credential(withProviderID providerID: String, idToken: String,
                                 rawNonce: String) -> OAuthCredential {
diff --git a/FirebaseAuth/Tests/Unit/SwiftAPI.swift b/FirebaseAuth/Tests/Unit/SwiftAPI.swift
index d24b8db59ad..dec351aff3e 100644
--- a/FirebaseAuth/Tests/Unit/SwiftAPI.swift
+++ b/FirebaseAuth/Tests/Unit/SwiftAPI.swift
@@ -474,34 +474,24 @@ class AuthAPI_hOnlyTests: XCTestCase {
   func FIROAuthProvider_h() {
     let _: (String, Auth) -> OAuthProvider = OAuthProvider.init(providerID:auth:)
     let _: (AuthProviderID, Auth) -> OAuthProvider = OAuthProvider.init(providerID:auth:)
-    let _: (String) -> OAuthProvider = OAuthProvider.provider(providerID:)
-    let _: (String, Auth) -> OAuthProvider = OAuthProvider.provider(providerID:auth:)
     let _: (AuthProviderID) -> OAuthProvider = OAuthProvider.provider(providerID:)
     let _: (AuthProviderID, Auth) -> OAuthProvider = OAuthProvider.provider(providerID:auth:)
     // `auth` defaults to `nil`
     let provider = OAuthProvider(providerID: "id")
     let _: String = provider.providerID
     #if os(iOS)
-      let _: (String, String, String?) -> OAuthCredential =
-        OAuthProvider.credential(withProviderID:idToken:accessToken:)
       let _: (AuthProviderID, String, String?) -> OAuthCredential =
         OAuthProvider.credential(providerID:idToken:accessToken:)
       // `accessToken` defaults to `nil`
       let _: OAuthCredential =
         OAuthProvider.credential(providerID: .apple, idToken: "")
-      let _: (String, String) -> OAuthCredential =
-        OAuthProvider.credential(withProviderID:accessToken:)
       let _: (AuthProviderID, String) -> OAuthCredential = OAuthProvider
         .credential(providerID:accessToken:)
-      let _: (String, String, String, String) -> OAuthCredential =
-        OAuthProvider.credential(withProviderID:idToken:rawNonce:accessToken:)
       let _: (AuthProviderID, String, String, String?) -> OAuthCredential =
         OAuthProvider.credential(providerID:idToken:rawNonce:accessToken:)
       // `accessToken` defaults to `nil`
       let _: OAuthCredential =
         OAuthProvider.credential(providerID: .apple, idToken: "", rawNonce: "")
-      let _: (String, String, String) -> OAuthCredential =
-        OAuthProvider.credential(withProviderID:idToken:rawNonce:)
 
       provider.getCredentialWith(provider as? AuthUIDelegate) { credential, error in
       }