diff --git a/packages/plugins/openapi/src/rest-generator.ts b/packages/plugins/openapi/src/rest-generator.ts
index 4e7c8bcb..c0447763 100644
--- a/packages/plugins/openapi/src/rest-generator.ts
+++ b/packages/plugins/openapi/src/rest-generator.ts
@@ -860,7 +860,7 @@ export class RESTfulOpenAPIGenerator extends OpenAPIGeneratorBase {
         // For compound ids each component is also exposed as a separate fields for read operations,
         // but not required for write operations
         const fields =
-            idFields.length > 1 && mode === 'read' ? model.fields : model.fields.filter((f) => !isIdField(f));
+            idFields.length > 1 && mode !== 'update' ? model.fields : model.fields.filter((f) => !isIdField(f));
 
         const attributes: Record<string, OAPI.SchemaObject> = {};
         const relationships: Record<string, OAPI.ReferenceObject | OAPI.SchemaObject> = {};
@@ -907,7 +907,7 @@ export class RESTfulOpenAPIGenerator extends OpenAPIGeneratorBase {
         if (mode === 'create') {
             // 'id' is required if there's no default value
             const idFields = model.fields.filter((f) => isIdField(f));
-            if (idFields.length && idFields.every((f) => !hasAttribute(f, '@default'))) {
+            if (idFields.length === 1 && idFields.every((f) => !hasAttribute(f, '@default'))) {
                 properties = { id: { type: 'string' }, ...properties };
                 toplevelRequired.unshift('id');
             }
diff --git a/packages/plugins/openapi/tests/baseline/rest-3.0.0.baseline.yaml b/packages/plugins/openapi/tests/baseline/rest-3.0.0.baseline.yaml
index adb9ded1..f0b46fc9 100644
--- a/packages/plugins/openapi/tests/baseline/rest-3.0.0.baseline.yaml
+++ b/packages/plugins/openapi/tests/baseline/rest-3.0.0.baseline.yaml
@@ -3135,14 +3135,11 @@ components:
                     type: object
                     description: The "PostLike" model
                     required:
-                        - id
                         - type
                         - attributes
                     properties:
                         type:
                             type: string
-                        attributes:
-                            type: object
                         relationships:
                             type: object
                             properties:
diff --git a/packages/plugins/openapi/tests/baseline/rest-3.1.0.baseline.yaml b/packages/plugins/openapi/tests/baseline/rest-3.1.0.baseline.yaml
index f69536b3..79e0c020 100644
--- a/packages/plugins/openapi/tests/baseline/rest-3.1.0.baseline.yaml
+++ b/packages/plugins/openapi/tests/baseline/rest-3.1.0.baseline.yaml
@@ -3149,7 +3149,6 @@ components:
                     type: object
                     description: The "PostLike" model
                     required:
-                        - id
                         - type
                         - attributes
                     properties: