diff --git a/packages/aws-cdk-lib/aws-stepfunctions-tasks/lib/bedrock/invoke-model.ts b/packages/aws-cdk-lib/aws-stepfunctions-tasks/lib/bedrock/invoke-model.ts
index 03a7837560676..6d789ff85a356 100644
--- a/packages/aws-cdk-lib/aws-stepfunctions-tasks/lib/bedrock/invoke-model.ts
+++ b/packages/aws-cdk-lib/aws-stepfunctions-tasks/lib/bedrock/invoke-model.ts
@@ -188,11 +188,11 @@ export class BedrockInvokeModel extends sfn.TaskStateBase {
     if (props.output?.s3Location?.objectVersion !== undefined) {
       throw new Error('Output S3 object version is not supported.');
     }
-    if (props.input?.s3InputUri && props.input.s3Location) {
-      throw new Error('Cannot specify both S3 InputUri and S3 location');
+    if (props.input?.s3InputUri && props.input.s3Location || props.output?.s3OutputUri && props.output.s3Location) {
+      throw new Error('Either specify S3 Uri or S3 location, but not both.');
     }
-    if (props.input?.s3InputUri === '') {
-      throw new Error('S3 InputUri cannot be an empty string');
+    if (useNewS3UriParamsForTask && (props.input?.s3InputUri === '' || props.output?.s3OutputUri === '')) {
+      throw new Error('S3 Uri cannot be an empty string');
     }
 
     //Warning to let users know about the newly introduced props
diff --git a/packages/aws-cdk-lib/aws-stepfunctions-tasks/test/bedrock/invoke-model.test.ts b/packages/aws-cdk-lib/aws-stepfunctions-tasks/test/bedrock/invoke-model.test.ts
index e66cd7301e7d2..4b5fdb894dba4 100644
--- a/packages/aws-cdk-lib/aws-stepfunctions-tasks/test/bedrock/invoke-model.test.ts
+++ b/packages/aws-cdk-lib/aws-stepfunctions-tasks/test/bedrock/invoke-model.test.ts
@@ -394,6 +394,50 @@ describe('Invoke Model', () => {
     });
   });
 
+  test('throws error S3 input Uri is specified as an empty string', () => {
+    const app = new cdk.App({ context: { [cxapi.USE_NEW_S3URI_PARAMETERS_FOR_BEDROCK_INVOKE_MODEL_TASK]: true } });
+    const stack = new cdk.Stack(app);
+    const model = bedrock.ProvisionedModel.fromProvisionedModelArn(stack, 'Imported', 'arn:aws:bedrock:us-turbo-2:123456789012:provisioned-model/abc-123');
+
+    expect(() => {
+      new BedrockInvokeModel(stack, 'Invoke', {
+        model,
+        input: {
+          s3InputUri: '',
+        },
+        output: {
+          s3OutputUri: '',
+        },
+      });
+    }).toThrow('S3 Uri cannot be an empty string');
+  });
+
+  test('cannot specify both s3 uri and s3 bucket', () => {
+    const app = new cdk.App({ context: { [cxapi.USE_NEW_S3URI_PARAMETERS_FOR_BEDROCK_INVOKE_MODEL_TASK]: true } });
+    const stack = new cdk.Stack(app);
+    const model = bedrock.ProvisionedModel.fromProvisionedModelArn(stack, 'Imported', 'arn:aws:bedrock:us-turbo-2:123456789012:provisioned-model/abc-123');
+
+    expect(() => {
+      new BedrockInvokeModel(stack, 'Invoke', {
+        model,
+        input: {
+          s3Location: {
+            bucketName: 'test-bucket',
+            objectKey: 'input-key',
+          },
+          s3InputUri: sfn.JsonPath.stringAt('$.prompt'),
+        },
+        output: {
+          s3Location: {
+            bucketName: 'test-bucket',
+            objectKey: 'output-key',
+          },
+          s3OutputUri: sfn.JsonPath.stringAt('$.prompt'),
+        },
+      });
+    }).toThrow('Either specify S3 Uri or S3 location, but not both.');
+  });
+
   test('S3 permissions are created in generated policy when input and output locations are specified', () => {
     // GIVEN
     const stack = new cdk.Stack();
@@ -475,8 +519,8 @@ describe('Invoke Model', () => {
     // WHEN
     const task = new BedrockInvokeModel(stack, 'Invoke', {
       model,
-      input: { s3InputUri: sfn.JsonPath.stringAt('$.prompt') },
-      output: { s3OutputUri: sfn.JsonPath.stringAt('$.prompt') },
+      input: { s3InputUri: 's3://input-bucket/input-key' },
+      output: { s3OutputUri: 's3://input-bucket/output-key' },
     });
 
     new sfn.StateMachine(stack, 'StateMachine', {
diff --git a/packages/aws-cdk-lib/cx-api/FEATURE_FLAGS.md b/packages/aws-cdk-lib/cx-api/FEATURE_FLAGS.md
index 87785d00f7478..105449326312a 100644
--- a/packages/aws-cdk-lib/cx-api/FEATURE_FLAGS.md
+++ b/packages/aws-cdk-lib/cx-api/FEATURE_FLAGS.md
@@ -72,7 +72,7 @@ Flags come in three types:
 | [@aws-cdk/aws-ecs:removeDefaultDeploymentAlarm](#aws-cdkaws-ecsremovedefaultdeploymentalarm) | When enabled, remove default deployment alarm settings | 2.143.0 | (default) |
 | [@aws-cdk/custom-resources:logApiResponseDataPropertyTrueDefault](#aws-cdkcustom-resourceslogapiresponsedatapropertytruedefault) | When enabled, the custom resource used for `AwsCustomResource` will configure the `logApiResponseData` property as true by default | 2.145.0 | (fix) |
 | [@aws-cdk/aws-s3:keepNotificationInImportedBucket](#aws-cdkaws-s3keepnotificationinimportedbucket) | When enabled, Adding notifications to a bucket in the current stack will not remove notification from imported stack. | 2.155.0 | (fix) |
-| [@aws-cdk:aws-stepfunctions-tasks:useNewS3UriParametersForBedrockInvokeModelTask](#aws-cdkaws-stepfunctions-tasksusenews3uriparametersforbedrockinvokemodeltask) | When enabled, use new props for S3 URI field in task definition of state machine for bedrock invoke model. | 2.156.0 | (fix) |
+| [@aws-cdk:aws-stepfunctions-tasks:useNewS3UriParametersForBedrockInvokeModelTask](#aws-cdkaws-stepfunctions-tasksusenews3uriparametersforbedrockinvokemodeltask) | When enabled, use new props for S3 URI field in task definition of state machine for bedrock invoke model. | V2NEXT | (fix) |
 
 <!-- END table -->
 
@@ -1372,7 +1372,7 @@ When this feature flag is enabled, specify newly introduced props 's3InputUri' a
 | Since | Default | Recommended |
 | ----- | ----- | ----- |
 | (not in v1) |  |  |
-| 2.156.0 | `true` | `true` |
+| V2NEXT | `false` | `true` |
 
 
 <!-- END details -->
diff --git a/packages/aws-cdk-lib/cx-api/lib/features.ts b/packages/aws-cdk-lib/cx-api/lib/features.ts
index 9463ca7ca8848..db501b3ea03be 100644
--- a/packages/aws-cdk-lib/cx-api/lib/features.ts
+++ b/packages/aws-cdk-lib/cx-api/lib/features.ts
@@ -1121,7 +1121,7 @@ export const FLAGS: Record<string, FlagInfo> = {
     's3OutputUri' to populate S3 uri under input and output fields in state machine task definition for Bedrock invoker model.  
 
     `,
-    introducedIn: { v2: '2.155.1' },
+    introducedIn: { v2: 'V2NEXT' },
     recommendedValue: true,
   },
 };