diff --git a/util.go b/util.go
index d634868..05cee9a 100644
--- a/util.go
+++ b/util.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"github.com/Azure/azure-sdk-for-go/sdk/ai/azopenai"
+	"github.com/Azure/azure-sdk-for-go/sdk/azcore/policy"
 	"github.com/Azure/azure-sdk-for-go/sdk/azcore/to"
 	"github.com/cli/go-gh/v2/pkg/api"
 	"github.com/joho/godotenv"
@@ -118,7 +119,12 @@ func getChatCompletionResponse(messages []azopenai.ChatMessage) (string, error)
 	var client *azopenai.Client
 
 	if strings.Contains(url, "azure") {
-		client, err = azopenai.NewClientWithKeyCredential(url, keyCredential, nil)
+		clientOptions := &azopenai.ClientOptions{
+			ClientOptions: policy.ClientOptions{
+				APIVersion: "2024-12-01-preview",
+			},
+		}
+		client, err = azopenai.NewClientWithKeyCredential(url, keyCredential, clientOptions)
 		if err != nil {
 			return "", fmt.Errorf("error creating Azure OpenAI client: %v", err)
 		}
diff --git a/util_test.go b/util_test.go
index ad38973..df2ecc8 100644
--- a/util_test.go
+++ b/util_test.go
@@ -4,6 +4,7 @@ import (
 	"reflect"
 	"testing"
 	"github.com/Azure/azure-sdk-for-go/sdk/ai/azopenai"
+	"github.com/Azure/azure-sdk-for-go/sdk/azcore/policy"
 )
 
 func Test_getGitDiff(t *testing.T) {
@@ -188,3 +189,18 @@ func Test_formatResponse(t *testing.T) {
 		})
 	}
 }
+
+func Test_azureClientOptionsSetAPIVersion(t *testing.T) {
+	// Test that Azure client creation includes proper API version
+	// This test verifies the fix for o4-mini model compatibility
+	clientOptions := &azopenai.ClientOptions{
+		ClientOptions: policy.ClientOptions{
+			APIVersion: "2024-12-01-preview",
+		},
+	}
+	
+	// Verify the API version is set correctly
+	if clientOptions.ClientOptions.APIVersion != "2024-12-01-preview" {
+		t.Errorf("Expected API version to be '2024-12-01-preview', got '%s'", clientOptions.ClientOptions.APIVersion)
+	}
+}