diff --git a/sdk/core/System.ClientModel/CHANGELOG.md b/sdk/core/System.ClientModel/CHANGELOG.md
index 6878bacb6092..e924704c34ea 100644
--- a/sdk/core/System.ClientModel/CHANGELOG.md
+++ b/sdk/core/System.ClientModel/CHANGELOG.md
@@ -10,6 +10,8 @@
 
 ### Other Changes
 
+- Removed implicit cast from `string` to `ApiKeyCredential`.
+
 ## 1.1.0-beta.7 (2024-08-14)
 
 ### Features Added
diff --git a/sdk/core/System.ClientModel/api/System.ClientModel.net6.0.cs b/sdk/core/System.ClientModel/api/System.ClientModel.net6.0.cs
index 38a53857153d..a510e31d07d7 100644
--- a/sdk/core/System.ClientModel/api/System.ClientModel.net6.0.cs
+++ b/sdk/core/System.ClientModel/api/System.ClientModel.net6.0.cs
@@ -4,7 +4,6 @@ public partial class ApiKeyCredential
     {
         public ApiKeyCredential(string key) { }
         public void Deconstruct(out string key) { throw null; }
-        public static implicit operator System.ClientModel.ApiKeyCredential (string key) { throw null; }
         public void Update(string key) { }
     }
     public abstract partial class AsyncCollectionResult<T> : System.ClientModel.ClientResult, System.Collections.Generic.IAsyncEnumerable<T>
diff --git a/sdk/core/System.ClientModel/api/System.ClientModel.netstandard2.0.cs b/sdk/core/System.ClientModel/api/System.ClientModel.netstandard2.0.cs
index 2a716c72f50d..ad3a7a378fc0 100644
--- a/sdk/core/System.ClientModel/api/System.ClientModel.netstandard2.0.cs
+++ b/sdk/core/System.ClientModel/api/System.ClientModel.netstandard2.0.cs
@@ -4,7 +4,6 @@ public partial class ApiKeyCredential
     {
         public ApiKeyCredential(string key) { }
         public void Deconstruct(out string key) { throw null; }
-        public static implicit operator System.ClientModel.ApiKeyCredential (string key) { throw null; }
         public void Update(string key) { }
     }
     public abstract partial class AsyncCollectionResult<T> : System.ClientModel.ClientResult, System.Collections.Generic.IAsyncEnumerable<T>
diff --git a/sdk/core/System.ClientModel/src/Convenience/ApiKeyCredential.cs b/sdk/core/System.ClientModel/src/Convenience/ApiKeyCredential.cs
index 25968d7b4550..5549597debbb 100644
--- a/sdk/core/System.ClientModel/src/Convenience/ApiKeyCredential.cs
+++ b/sdk/core/System.ClientModel/src/Convenience/ApiKeyCredential.cs
@@ -65,7 +65,4 @@ public void Update(string key)
 
         Volatile.Write(ref _key, key);
     }
-
-    /// <summary> Converts a string to an <see cref="ApiKeyCredential"/>. </summary>
-    public static implicit operator ApiKeyCredential(string key) => new(key);
 }
diff --git a/sdk/core/System.ClientModel/tests/Pipeline/ApiKeyAuthenticationPolicyTests.cs b/sdk/core/System.ClientModel/tests/Pipeline/ApiKeyAuthenticationPolicyTests.cs
index e5638343fbfb..874e6ba0c7b6 100644
--- a/sdk/core/System.ClientModel/tests/Pipeline/ApiKeyAuthenticationPolicyTests.cs
+++ b/sdk/core/System.ClientModel/tests/Pipeline/ApiKeyAuthenticationPolicyTests.cs
@@ -16,19 +16,6 @@ public ApiKeyAuthenticationPolicyTests(bool isAsync) : base(isAsync)
     {
     }
 
-    [Test]
-    public void CanImplicitlyCastApiKeyCredential()
-    {
-        string keyValue = "test_key";
-        ApiKeyCredential credential1 = new(keyValue);
-        ApiKeyCredential credential2 = keyValue;
-
-        credential1.Deconstruct(out string deconstructed1);
-        credential2.Deconstruct(out string deconstructed2);
-
-        Assert.AreEqual(deconstructed1, deconstructed2);
-    }
-
     [Test]
     public async Task HeaderPolicySetsKey()
     {