diff --git a/onnxruntime/core/graph/model.cc b/onnxruntime/core/graph/model.cc
index 46cb19f531..3d03b2b4ef 100644
--- a/onnxruntime/core/graph/model.cc
+++ b/onnxruntime/core/graph/model.cc
@@ -3,6 +3,7 @@
 
 #include "core/graph/model.h"
 #include <memory>
+#include "core/common/logging/logging.h"
 
 #ifdef _MSC_VER
 #pragma warning(push)
@@ -104,7 +105,21 @@ Model::Model(std::unique_ptr<ModelProto> model_proto, const IOnnxRuntimeOpSchema
 
   std::unordered_map<std::string, int> domain_to_version;
   for (auto& opSet : model_proto_->opset_import()) {
-    domain_to_version[opSet.domain()] = gsl::narrow_cast<int>(opSet.version());
+    const auto& domain = opSet.domain();
+    const auto version = opSet.version();
+    // empty domain and 'ai.onnx' are equivalent
+    if ((domain.empty() || domain == "ai.onnx") && version < 7) {
+      // TODO: Check if we can upgrade all the current opset 6 models that are being tested
+      // in CI to opset 7 or above
+      LOGS_DEFAULT(WARNING) << "ONNX Runtime only *guarantees* support for models stamped "
+                               "with opset version 7 or above for opset domain 'ai.onnx'. "
+                               "Please upgrade your model to opset 7 or higher. "
+                               "For now, this opset "
+                            <<  version
+                            << " model may run depending upon legacy support "
+                               "of some older opset version operators.";
+    }
+    domain_to_version[domain] = gsl::narrow_cast<int>(version);
   }
 
   auto domain_map = schema_registry->GetLatestOpsetVersions(false);
diff --git a/onnxruntime/test/contrib_ops/dynamic_slice_op_test.cc b/onnxruntime/test/contrib_ops/dynamic_slice_op_test.cc
index fd590efbdc..3d450afd03 100644
--- a/onnxruntime/test/contrib_ops/dynamic_slice_op_test.cc
+++ b/onnxruntime/test/contrib_ops/dynamic_slice_op_test.cc
@@ -79,8 +79,8 @@ TEST(DynamicSliceTest, dynamic_slice_with_negative_axes) {
 
   OpTester test2 ("DynamicSlice", 1);
   test2.AddInput  <int32_t> ("data",   {3,3,3}, {1, 2, 3, 4, 5, 6, 7, 8, 9,
-					       10,11,12,13,14,15,16,17,18,
-					       19,20,21,22,23,24,25,26,27});
+                           10,11,12,13,14,15,16,17,18,
+                           19,20,21,22,23,24,25,26,27});
   test2.AddInput  <int32_t> ("starts", {2},     {-3,0});
   test2.AddInput  <int32_t> ("ends",   {2},     {-1,2});
   test2.AddInput  <int32_t> ("axes",   {2},     {0,2});