diff --git a/release/models/gnpsi/.spec.yml b/release/models/gnpsi/.spec.yml
new file mode 100644
index 000000000..a38191a7f
--- /dev/null
+++ b/release/models/gnpsi/.spec.yml
@@ -0,0 +1,6 @@
+- name: openconfig-gnpsi
+  docs:
+    - yang/gnpsi/openconfig-gnpsi-types.yang
+  build:
+    - yang/gnpsi/openconfig-gnpsi-types.yang
+  run-ci: false
diff --git a/release/models/gnpsi/openconfig-gnpsi-types.yang b/release/models/gnpsi/openconfig-gnpsi-types.yang
new file mode 100644
index 000000000..ef241b635
--- /dev/null
+++ b/release/models/gnpsi/openconfig-gnpsi-types.yang
@@ -0,0 +1,38 @@
+module openconfig-gnpsi-types {
+  yang-version "1";
+  namespace "http://openconfig.net/yang/gnpsi/types";
+  prefix "oc-gnpsit";
+
+  import openconfig-extensions {
+    prefix oc-ext;
+  }
+
+  import openconfig-grpc-types {
+    prefix oc-grpct;
+  }
+
+  organization
+    "OpenConfig working group";
+  contact
+    "www.openconfig.net";
+
+  description
+    "This module adds gRPC server type relating to gNPSI running on
+    a network device.";
+
+  oc-ext:openconfig-version "0.1.0";
+  oc-ext:catalog-organization "openconfig";
+  oc-ext:origin "openconfig";
+
+  revision 2024-05-29 {
+    description
+      "Initial revision.";
+    reference "0.1.0";
+  }
+
+  identity GNPSI {
+    base oc-grpct:GRPC_SERVICE;
+    description
+      "gNMI: gRPC Network Management Interface";
+  }
+}
diff --git a/release/models/grpc/.spec.yml b/release/models/grpc/.spec.yml
new file mode 100644
index 000000000..5e9761d03
--- /dev/null
+++ b/release/models/grpc/.spec.yml
@@ -0,0 +1,6 @@
+- name: openconfig-grpc
+  docs:
+    - yang/grpc/openconfig-grpc-types.yang
+  build:
+    - yang/grpc/openconfig-grpc-types.yang
+  run-ci: false
diff --git a/release/models/grpc/openconfig-grpc-types.yang b/release/models/grpc/openconfig-grpc-types.yang
new file mode 100644
index 000000000..d9944070b
--- /dev/null
+++ b/release/models/grpc/openconfig-grpc-types.yang
@@ -0,0 +1,36 @@
+module openconfig-grpc-types {
+  yang-version "1";
+  namespace "http://openconfig.net/yang/grpc/types";
+  prefix "oc-grpct";
+
+  import openconfig-extensions {
+    prefix oc-ext;
+  }
+
+  organization
+    "OpenConfig working group";
+  contact
+    "www.openconfig.net";
+
+  description
+    "This module adds gRPC server type relating to gRPC services running on
+    a network device.
+    The GRPC_SERVICE identity is used to create an extensible list of services
+    that can be instantiated, with a base set defined in this module. New
+    services can extend the identity to be included in the list.";
+
+  oc-ext:openconfig-version "0.1.0";
+  oc-ext:catalog-organization "openconfig";
+  oc-ext:origin "openconfig";
+
+  revision "2024-05-29" {
+    description
+      "Initial revision.";
+    reference "0.1.0";
+  }
+
+  identity GRPC_SERVICE {
+    description
+      "Base identity for a gRPC-based service.";
+  }
+}
diff --git a/release/models/system/openconfig-system-grpc.yang b/release/models/system/openconfig-system-grpc.yang
index fb16870a2..6560806c1 100644
--- a/release/models/system/openconfig-system-grpc.yang
+++ b/release/models/system/openconfig-system-grpc.yang
@@ -8,6 +8,7 @@ module openconfig-system-grpc {
   import openconfig-system { prefix oc-sys; }
   import openconfig-inet-types { prefix oc-inet; }
   import openconfig-network-instance { prefix oc-ni; }
+  import openconfig-yang-types { prefix oc-yang; }
 
   organization
     "OpenConfig working group";
@@ -22,10 +23,16 @@ module openconfig-system-grpc {
     to be included in the list.";
 
 
-  oc-ext:openconfig-version "1.0.0";
+  oc-ext:openconfig-version "1.1.0";
   oc-ext:catalog-organization "openconfig";
   oc-ext:origin "openconfig";
 
+  revision "2024-05-29" {
+    description
+      "Add support for gRPC connections.";
+    reference "1.1.0";
+  }
+
   revision "2022-04-19" {
     description
       "Description and default value updates for grpc-server
@@ -97,6 +104,7 @@ module openconfig-system-grpc {
             "Operational state relating to the gRPC service.";
           uses grpc-server-config;
         }
+        uses connections-top;
       }
     }
   }
@@ -200,6 +208,99 @@ module openconfig-system-grpc {
     }
   }
 
+  grouping grpc-counters {
+    description
+      "Top-level container for gRPC counters.";
+    container counters {
+      description
+        "Operational data for gRPC counters.";
+      uses grpc-counters-top;
+    }
+  }
+
+  grouping grpc-counters-top {
+    description
+      "Top-level container of operational data for gRPC counters.";
+
+    leaf bytes-sent {
+      type oc-yang:counter64;
+      description
+        "The total number of bytes sent to the client.";
+    }
+
+    leaf packets-sent {
+      type oc-yang:counter64;
+      description
+        "The total number of packets sent to the client.";
+    }
+
+    leaf data-send-error {
+      type oc-yang:counter64;
+      description
+        "A count of errors the gRPC server encountered when
+        sending data to a grpc client.";
+    }
+  }
+
+  grouping grpc-server-connections-state {
+    description
+      "Operational data for gRPC server connections.";
+
+    leaf address {
+      type oc-inet:ip-address;
+      description
+        "IPv4/IPv6 address of the gRPC server connection.";
+    }
+
+    leaf port {
+      type oc-inet:port-number;
+      description
+        "TCP/UDP port number for the gRPC server connection.";
+    }
+  }
+
+  grouping connections-top {
+    description
+      "Top-level grouping for data related to gRPC connections.";
+
+    container connections {
+      config false;
+      description
+        "Enclosing container for list of gRPC connections.";
+
+      list connection {
+        key "address port";
+        description
+          "List of gRPC connections";
+
+        leaf address {
+          type leafref {
+            path "../state/address";
+          }
+          description
+            "Reference to address list key.";
+        }
+
+        leaf port {
+          type leafref {
+            path "../state/port";
+          }
+          description
+            "Reference to port list key.";
+        }
+
+        container state {
+          config false;
+          description
+            "Operational state data for gRPC connections.";
+
+          uses grpc-server-connections-state;
+          uses grpc-counters;
+        }
+      }
+    }
+  }
+
   augment "/oc-sys:system" {
     description
       "Add gRPC service configuration to the openconfig-system model.";