diff --git a/common/src/main/java/org/opensearch/ml/common/model/ModelGuardrail.java b/common/src/main/java/org/opensearch/ml/common/model/ModelGuardrail.java
index 07d75a32ce..d64050a8a3 100644
--- a/common/src/main/java/org/opensearch/ml/common/model/ModelGuardrail.java
+++ b/common/src/main/java/org/opensearch/ml/common/model/ModelGuardrail.java
@@ -28,7 +28,6 @@
 import org.opensearch.ml.common.transport.MLTaskResponse;
 import org.opensearch.ml.common.transport.prediction.MLPredictionTaskAction;
 import org.opensearch.ml.common.transport.prediction.MLPredictionTaskRequest;
-import org.opensearch.ml.common.utils.StringUtils;
 
 import java.io.IOException;
 import java.security.AccessController;
@@ -51,7 +50,7 @@
 public class ModelGuardrail extends Guardrail {
     public static final String MODEL_ID_FIELD = "model_id";
     public static final String RESPONSE_FILTER_FIELD = "response_filter";
-    public static final String RESPONSE_ACCEPT_FIELD = "response_accept";
+    public static final String RESPONSE_VALIDATION_REGEX_FIELD = "response_validation_regex";
 
     private String modelId;
     private String responseFilter;
@@ -67,7 +66,7 @@ public ModelGuardrail(String modelId, String responseFilter, String responseAcce
         this.responseAccept = responseAccept;
     }
     public ModelGuardrail(@NonNull Map<String, Object> params) {
-        this((String) params.get(MODEL_ID_FIELD), (String) params.get(RESPONSE_FILTER_FIELD), (String) params.get(RESPONSE_ACCEPT_FIELD));
+        this((String) params.get(MODEL_ID_FIELD), (String) params.get(RESPONSE_FILTER_FIELD), (String) params.get(RESPONSE_VALIDATION_REGEX_FIELD));
     }
 
     public ModelGuardrail(StreamInput input) throws IOException {
@@ -157,7 +156,7 @@ public XContentBuilder toXContent(XContentBuilder builder, Params params) throws
             builder.field(RESPONSE_FILTER_FIELD, responseFilter);
         }
         if (responseAccept != null) {
-            builder.field(RESPONSE_ACCEPT_FIELD, responseAccept);
+            builder.field(RESPONSE_VALIDATION_REGEX_FIELD, responseAccept);
         }
         builder.endObject();
         return builder;
@@ -180,7 +179,7 @@ public static ModelGuardrail parse(XContentParser parser) throws IOException {
                 case RESPONSE_FILTER_FIELD:
                     responseFilter = parser.text();
                     break;
-                case RESPONSE_ACCEPT_FIELD:
+                case RESPONSE_VALIDATION_REGEX_FIELD:
                     responseAccept = parser.text();
                     break;
                 default:
diff --git a/common/src/test/java/org/opensearch/ml/common/model/ModelGuardrailTests.java b/common/src/test/java/org/opensearch/ml/common/model/ModelGuardrailTests.java
index 9c30dc06e1..ebbbd0b9a4 100644
--- a/common/src/test/java/org/opensearch/ml/common/model/ModelGuardrailTests.java
+++ b/common/src/test/java/org/opensearch/ml/common/model/ModelGuardrailTests.java
@@ -83,12 +83,12 @@ public void toXContent() throws IOException {
         modelGuardrail.toXContent(builder, ToXContent.EMPTY_PARAMS);
         String content = TestHelper.xContentBuilderToString(builder);
 
-        Assert.assertEquals("{\"model_id\":\"test_model_id\",\"response_filter\":\"$.test\",\"response_accept\":\"^accept$\"}", content);
+        Assert.assertEquals("{\"model_id\":\"test_model_id\",\"response_filter\":\"$.test\",\"response_validation_regex\":\"^accept$\"}", content);
     }
 
     @Test
     public void parse() throws IOException {
-        String jsonStr = "{\"model_id\":\"test_model_id\",\"response_filter\":\"$.test\",\"response_accept\":\"^accept$\"}";
+        String jsonStr = "{\"model_id\":\"test_model_id\",\"response_filter\":\"$.test\",\"response_validation_regex\":\"^accept$\"}";
         XContentParser parser = XContentType.JSON.xContent().createParser(new NamedXContentRegistry(new SearchModule(Settings.EMPTY,
                 Collections.emptyList()).getNamedXContents()), null, jsonStr);
         parser.nextToken();
diff --git a/plugin/src/test/java/org/opensearch/ml/rest/RestMLGuardrailsIT.java b/plugin/src/test/java/org/opensearch/ml/rest/RestMLGuardrailsIT.java
index 0ca15a6220..44533d3ae5 100644
--- a/plugin/src/test/java/org/opensearch/ml/rest/RestMLGuardrailsIT.java
+++ b/plugin/src/test/java/org/opensearch/ml/rest/RestMLGuardrailsIT.java
@@ -467,13 +467,13 @@ protected Response registerRemoteModelWithModelGuardrails(String name, String co
             + "      \"model_id\": \""
             + guardrailModelId
             + "\",\n"
-            + "      \"response_accept\": \"^\\\"\\\\s*[Aa]ccept\\\\s*\\\"$\""
+            + "      \"response_validation_regex\": \"^\\\"\\\\s*[Aa]ccept\\\\s*\\\"$\""
             + "    },\n"
             + "    \"output_guardrail\": {\n"
             + "      \"model_id\": \""
             + guardrailModelId
             + "\",\n"
-            + "      \"response_accept\": \"^\\\"\\\\s*[Aa]ccept\\\\s*\\\"$\""
+            + "      \"response_validation_regex\": \"^\\\"\\\\s*[Aa]ccept\\\\s*\\\"$\""
             + "    }\n"
             + "  }\n"
             + "}";