diff --git a/src/Cli/src/Helpers.cs b/src/Cli/src/Helpers.cs
index 9d7a2eca..f17cb3ab 100644
--- a/src/Cli/src/Helpers.cs
+++ b/src/Cli/src/Helpers.cs
@@ -107,6 +107,7 @@ public static IChatClient GetChatModel(
     {
         Provider.Free or Provider.OpenRouter => new Uri(tryAGI.OpenAI.CustomProviders.OpenRouterBaseUrl),
         Provider.Requesty => new Uri("https://router.requesty.ai/v1"),
+        Provider.Opper => new Uri("https://api.opper.ai/v3/compat"),
         _ => null,
     };
 
@@ -115,6 +116,7 @@ public static IChatClient GetChatModel(
         Provider.OpenAi or null => "OPENAI_API_KEY",
         Provider.OpenRouter or Provider.Free => "OPENROUTER_API_KEY",
         Provider.Requesty => "REQUESTY_API_KEY",
+        Provider.Opper => "OPPER_API_KEY",
         _ => throw new NotImplementedException(),
     };
 }
diff --git a/src/Cli/src/Models/Provider.cs b/src/Cli/src/Models/Provider.cs
index ee560002..154dbd78 100644
--- a/src/Cli/src/Models/Provider.cs
+++ b/src/Cli/src/Models/Provider.cs
@@ -5,6 +5,7 @@ internal enum Provider
     OpenAi,
     OpenRouter,
     Requesty,
+    Opper,
     Anthropic,
     Free,
 }
\ No newline at end of file
diff --git a/src/Cli/test/LangChain.Cli.IntegrationTests/HelpersTests.cs b/src/Cli/test/LangChain.Cli.IntegrationTests/HelpersTests.cs
index 1c9abf04..e832d252 100644
--- a/src/Cli/test/LangChain.Cli.IntegrationTests/HelpersTests.cs
+++ b/src/Cli/test/LangChain.Cli.IntegrationTests/HelpersTests.cs
@@ -11,4 +11,11 @@ public void Requesty_UsesExpectedEndpointAndApiKeyEnvironmentVariable()
         Helpers.GetEndpoint(Provider.Requesty).Should().Be(new Uri("https://router.requesty.ai/v1"));
         Helpers.GetApiKeyEnvironmentVariable(Provider.Requesty).Should().Be("REQUESTY_API_KEY");
     }
+
+    [Test]
+    public void Opper_UsesExpectedEndpointAndApiKeyEnvironmentVariable()
+    {
+        Helpers.GetEndpoint(Provider.Opper).Should().Be(new Uri("https://api.opper.ai/v3/compat"));
+        Helpers.GetApiKeyEnvironmentVariable(Provider.Opper).Should().Be("OPPER_API_KEY");
+    }
 }