diff --git a/modules/openapi-generator/src/main/resources/kotlin-client/data_class.mustache b/modules/openapi-generator/src/main/resources/kotlin-client/data_class.mustache
index 0ddf4793a444..1012709fd516 100644
--- a/modules/openapi-generator/src/main/resources/kotlin-client/data_class.mustache
+++ b/modules/openapi-generator/src/main/resources/kotlin-client/data_class.mustache
@@ -38,6 +38,10 @@ import kotlinx.parcelize.Parcelize
 import kotlinx.serialization.*
 import kotlinx.serialization.descriptors.*
 import kotlinx.serialization.encoding.*
+{{#discriminator}}import kotlinx.serialization.json.JsonContentPolymorphicSerializer
+import kotlinx.serialization.json.JsonElement
+import kotlinx.serialization.json.jsonObject
+{{/discriminator}}
 {{/multiplatform}}
 {{#serializableModel}}
 import java.io.Serializable
@@ -57,18 +61,18 @@ import {{packageName}}.infrastructure.ITransformForStorage
 {{#parcelizeModels}}
 @Parcelize
 {{/parcelizeModels}}
-{{#multiplatform}}{{^discriminator}}@Serializable{{/discriminator}}{{/multiplatform}}{{#kotlinx_serialization}}{{#serializableModel}}@KSerializable{{/serializableModel}}{{^serializableModel}}@Serializable{{/serializableModel}}{{/kotlinx_serialization}}{{#moshi}}{{#moshiCodeGen}}@JsonClass(generateAdapter = true){{/moshiCodeGen}}{{/moshi}}{{#jackson}}{{#discriminator}}{{>typeInfoAnnotation}}{{/discriminator}}{{/jackson}}
+{{#multiplatform}}@Serializable{{#discriminator}}(with = {{classname}}Serializer::class){{/discriminator}}{{/multiplatform}}{{#kotlinx_serialization}}{{#serializableModel}}@KSerializable{{/serializableModel}}{{^serializableModel}}@Serializable{{/serializableModel}}{{/kotlinx_serialization}}{{#moshi}}{{#moshiCodeGen}}@JsonClass(generateAdapter = true){{/moshiCodeGen}}{{/moshi}}{{#jackson}}{{#discriminator}}{{>typeInfoAnnotation}}{{/discriminator}}{{/jackson}}
 {{#isDeprecated}}
 @Deprecated(message = "This schema is deprecated.")
 {{/isDeprecated}}
 {{>additionalModelTypeAnnotations}}
-{{#nonPublicApi}}internal {{/nonPublicApi}}{{#discriminator}}interface{{/discriminator}}{{^discriminator}}data class{{/discriminator}} {{classname}}{{^discriminator}} (
+{{#nonPublicApi}}internal {{/nonPublicApi}}{{#discriminator}}sealed class{{/discriminator}}{{^discriminator}}data class{{/discriminator}} {{classname}}{{^discriminator}} (
 
 {{#allVars}}
 {{#required}}{{>data_class_req_var}}{{/required}}{{^required}}{{>data_class_opt_var}}{{/required}}{{^-last}},{{/-last}}
 
 {{/allVars}}
-){{/discriminator}}{{#parent}}{{^serializableModel}}{{^parcelizeModels}} : {{{parent}}}{{#isMap}}(){{/isMap}}{{#isArray}}(){{/isArray}}{{/parcelizeModels}}{{/serializableModel}}{{/parent}}{{#parent}}{{#serializableModel}}{{^parcelizeModels}} : {{{parent}}}{{#isMap}}(){{/isMap}}{{#isArray}}(){{/isArray}}, Serializable{{/parcelizeModels}}{{/serializableModel}}{{/parent}}{{#parent}}{{^serializableModel}}{{#parcelizeModels}} : {{{parent}}}{{#isMap}}(){{/isMap}}{{#isArray}}(){{/isArray}}, Parcelable{{/parcelizeModels}}{{/serializableModel}}{{/parent}}{{#parent}}{{#serializableModel}}{{#parcelizeModels}} : {{{parent}}}{{#isMap}}(){{/isMap}}{{#isArray}}(){{/isArray}}, Serializable, Parcelable{{/parcelizeModels}}{{/serializableModel}}{{/parent}}{{^parent}}{{#serializableModel}}{{^parcelizeModels}} : Serializable{{/parcelizeModels}}{{/serializableModel}}{{/parent}}{{^parent}}{{^serializableModel}}{{#parcelizeModels}} : Parcelable{{/parcelizeModels}}{{/serializableModel}}{{/parent}}{{^parent}}{{#serializableModel}}{{#parcelizeModels}} : Serializable, Parcelable{{/parcelizeModels}}{{/serializableModel}}{{/parent}}{{#generateRoomModels}}{{#parent}}, {{/parent}}{{^discriminator}}{{^parent}}:{{/parent}} ITransformForStorage<{{classname}}RoomModel>{{/discriminator}}{{/generateRoomModels}}{{#vendorExtensions.x-has-data-class-body}} {
+){{/discriminator}}{{#parent}}{{^serializableModel}}{{^parcelizeModels}} : {{{parent}}}(){{/parcelizeModels}}{{/serializableModel}}{{/parent}}{{#parent}}{{#serializableModel}}{{^parcelizeModels}} : {{{parent}}}(), Serializable{{/parcelizeModels}}{{/serializableModel}}{{/parent}}{{#parent}}{{^serializableModel}}{{#parcelizeModels}} : {{{parent}}}(), Parcelable{{/parcelizeModels}}{{/serializableModel}}{{/parent}}{{#parent}}{{#serializableModel}}{{#parcelizeModels}} : {{{parent}}}(), Serializable, Parcelable{{/parcelizeModels}}{{/serializableModel}}{{/parent}}{{^parent}}{{#serializableModel}}{{^parcelizeModels}} : Serializable{{/parcelizeModels}}{{/serializableModel}}{{/parent}}{{^parent}}{{^serializableModel}}{{#parcelizeModels}} : Parcelable{{/parcelizeModels}}{{/serializableModel}}{{/parent}}{{^parent}}{{#serializableModel}}{{#parcelizeModels}} : Serializable, Parcelable{{/parcelizeModels}}{{/serializableModel}}{{/parent}}{{#generateRoomModels}}{{#parent}}, {{/parent}}{{^discriminator}}{{^parent}}:{{/parent}} ITransformForStorage<{{classname}}RoomModel>{{/discriminator}}{{/generateRoomModels}}{{#vendorExtensions.x-has-data-class-body}} {
 {{/vendorExtensions.x-has-data-class-body}}
 {{#generateRoomModels}}
     companion object { }
@@ -146,3 +150,13 @@ import {{packageName}}.infrastructure.ITransformForStorage
 {{#vendorExtensions.x-has-data-class-body}}
 }
 {{/vendorExtensions.x-has-data-class-body}}
+{{#discriminator}}
+
+internal object {{classname}}Serializer : JsonContentPolymorphicSerializer<{{classname}}>({{classname}}::class) {
+    override fun selectDeserializer(element: JsonElement) = when {
+    {{#mappedModels}}
+        "{{mappingName}}" in element.jsonObject["{{discriminatorName}}"].toString() -> {{modelName}}.serializer()
+    {{/mappedModels}}
+        else -> {{classname}}.serializer()
+    }
+}{{/discriminator}}
\ No newline at end of file
diff --git a/modules/openapi-generator/src/main/resources/kotlin-client/interface_req_var.mustache b/modules/openapi-generator/src/main/resources/kotlin-client/interface_req_var.mustache
index 743069ff554d..241bf514b0e0 100644
--- a/modules/openapi-generator/src/main/resources/kotlin-client/interface_req_var.mustache
+++ b/modules/openapi-generator/src/main/resources/kotlin-client/interface_req_var.mustache
@@ -15,4 +15,4 @@
     {{^isEnum}}{{^isArray}}{{^isPrimitiveType}}{{^isModel}}@Contextual {{/isModel}}{{/isPrimitiveType}}{{/isArray}}{{/isEnum}}@SerialName(value = "{{{vendorExtensions.x-base-name-literal}}}")
     {{/kotlinx_serialization}}
     {{/multiplatform}}
-    {{#multiplatform}}@SerialName(value = "{{{vendorExtensions.x-base-name-literal}}}") @Required {{/multiplatform}}{{>modelMutable}} {{{name}}}: {{#isArray}}{{#isList}}kotlin.collections.{{#modelMutable}}Mutable{{/modelMutable}}List{{/isList}}{{^isList}}kotlin.Array{{/isList}}<{{^items.isEnum}}{{^items.isPrimitiveType}}{{^items.isModel}}{{#kotlinx_serialization}}@Contextual {{/kotlinx_serialization}}{{/items.isModel}}{{/items.isPrimitiveType}}{{{items.dataType}}}{{/items.isEnum}}{{#items.isEnum}}{{classname}}.{{{nameInCamelCase}}}{{/items.isEnum}}>{{/isArray}}{{^isEnum}}{{^isArray}}{{{dataType}}}{{/isArray}}{{/isEnum}}{{#isEnum}}{{^isArray}}{{classname}}.{{{nameInCamelCase}}}{{/isArray}}{{/isEnum}}{{#isNullable}}?{{/isNullable}}
\ No newline at end of file
+    {{#multiplatform}}@SerialName(value = "{{{vendorExtensions.x-base-name-literal}}}") @Required {{^isInherited}}abstract {{/isInherited}}{{/multiplatform}}{{>modelMutable}} {{{name}}}: {{#isArray}}{{#isList}}kotlin.collections.{{#modelMutable}}Mutable{{/modelMutable}}List{{/isList}}{{^isList}}kotlin.Array{{/isList}}<{{^items.isEnum}}{{^items.isPrimitiveType}}{{^items.isModel}}{{#kotlinx_serialization}}@Contextual {{/kotlinx_serialization}}{{/items.isModel}}{{/items.isPrimitiveType}}{{{items.dataType}}}{{/items.isEnum}}{{#items.isEnum}}{{classname}}.{{{nameInCamelCase}}}{{/items.isEnum}}>{{/isArray}}{{^isEnum}}{{^isArray}}{{{dataType}}}{{/isArray}}{{/isEnum}}{{#isEnum}}{{^isArray}}{{classname}}.{{{nameInCamelCase}}}{{/isArray}}{{/isEnum}}{{#isNullable}}?{{/isNullable}}
\ No newline at end of file
diff --git a/samples/client/petstore/kotlin-allOff-discriminator/src/main/kotlin/org/openapitools/client/models/Animal.kt b/samples/client/petstore/kotlin-allOff-discriminator/src/main/kotlin/org/openapitools/client/models/Animal.kt
index f3a877f5a8ea..62300942a107 100644
--- a/samples/client/petstore/kotlin-allOff-discriminator/src/main/kotlin/org/openapitools/client/models/Animal.kt
+++ b/samples/client/petstore/kotlin-allOff-discriminator/src/main/kotlin/org/openapitools/client/models/Animal.kt
@@ -25,9 +25,15 @@ import com.squareup.moshi.Json
  */
 
 
-interface Animal {
+sealed class Animal {
 
     @Json(name = "id")
     val id: java.util.UUID
 }
 
+internal object AnimalSerializer : JsonContentPolymorphicSerializer<Animal>(Animal::class) {
+    override fun selectDeserializer(element: JsonElement) = when {
+        "BIRD" in element.jsonObject["type"].toString() -> Bird.serializer()
+        else -> Animal.serializer()
+    }
+}
diff --git a/samples/client/petstore/kotlin-allOff-discriminator/src/main/kotlin/org/openapitools/client/models/Bird.kt b/samples/client/petstore/kotlin-allOff-discriminator/src/main/kotlin/org/openapitools/client/models/Bird.kt
index 64a248fcc3bd..8b06fad79768 100644
--- a/samples/client/petstore/kotlin-allOff-discriminator/src/main/kotlin/org/openapitools/client/models/Bird.kt
+++ b/samples/client/petstore/kotlin-allOff-discriminator/src/main/kotlin/org/openapitools/client/models/Bird.kt
@@ -35,5 +35,5 @@ data class Bird (
     @Json(name = "featherType")
     val featherType: kotlin.String
 
-) : Animal
+) : Animal()