diff --git a/openapi-codegen/core/src/main/scala/sttp/tapir/codegen/BasicGenerator.scala b/openapi-codegen/core/src/main/scala/sttp/tapir/codegen/BasicGenerator.scala
index 84200a4845..cd5be2730a 100644
--- a/openapi-codegen/core/src/main/scala/sttp/tapir/codegen/BasicGenerator.scala
+++ b/openapi-codegen/core/src/main/scala/sttp/tapir/codegen/BasicGenerator.scala
@@ -61,6 +61,29 @@ object BasicGenerator {
            |}""".stripMargin
         headTag -> taggedObj
     }
+
+    val maybeSpecificationExtensionKeys = doc.paths
+      .flatMap { p =>
+        p.specificationExtensions.toSeq ++ p.methods.flatMap(_.specificationExtensions.toSeq)
+      }
+      .groupBy(_._1)
+      .map { case (keyName, pairs) =>
+        val values = pairs.map(_._2)
+        val distinctTypes = values.map(_.tpe).distinct
+        if (distinctTypes.size != 1)
+          throw new IllegalArgumentException(
+            s"specification extensions with the same key are expected to all have the same type. Found $distinctTypes for $keyName"
+          )
+        val `type` = distinctTypes.head
+        val name = strippedToCamelCase(keyName)
+        val uncapitalisedName = name.head.toLower + name.tail
+        val capitalisedName = name.head.toUpper + name.tail
+        s"""type ${capitalisedName}Extension = ${`type`}
+           |val ${uncapitalisedName}ExtensionKey = new sttp.tapir.AttributeKey[${capitalisedName}Extension]("$packagePath.$objName.${capitalisedName}Extension")
+           |""".stripMargin
+      }
+      .mkString("\n")
+
     val mainObj = s"""|
         |package $packagePath
         |
@@ -70,8 +93,9 @@ object BasicGenerator {
         |
         |${indent(2)(classGenerator.classDefs(doc, targetScala3, queryParamRefs, normalisedJsonLib, jsonParamRefs).getOrElse(""))}
         |
-        |${indent(2)(endpointsByTag.getOrElse(None, ""))}
+        |${indent(2)(maybeSpecificationExtensionKeys)}
         |
+        |${indent(2)(endpointsByTag.getOrElse(None, ""))}
         |}
         |""".stripMargin
     taggedObjs + (objName -> mainObj)
@@ -127,4 +151,11 @@ object BasicGenerator {
       case x => throw new NotImplementedError(s"Not all simple types supported! Found $x")
     }
   }
+
+  def strippedToCamelCase(string: String): String = string
+    .split("[^0-9a-zA-Z$_]")
+    .filter(_.nonEmpty)
+    .zipWithIndex
+    .map { case (part, 0) => part; case (part, _) => part.capitalize }
+    .mkString
 }
diff --git a/openapi-codegen/core/src/main/scala/sttp/tapir/codegen/EndpointGenerator.scala b/openapi-codegen/core/src/main/scala/sttp/tapir/codegen/EndpointGenerator.scala
index bb1f64f8ca..c8c032b14b 100644
--- a/openapi-codegen/core/src/main/scala/sttp/tapir/codegen/EndpointGenerator.scala
+++ b/openapi-codegen/core/src/main/scala/sttp/tapir/codegen/EndpointGenerator.scala
@@ -1,5 +1,5 @@
 package sttp.tapir.codegen
-import sttp.tapir.codegen.BasicGenerator.{indent, mapSchemaSimpleTypeToType}
+import sttp.tapir.codegen.BasicGenerator.{indent, mapSchemaSimpleTypeToType, strippedToCamelCase}
 import sttp.tapir.codegen.openapi.models.OpenapiModels.{
   OpenapiDocument,
   OpenapiParameter,
@@ -98,13 +98,7 @@ class EndpointGenerator {
               |$attributeString
               |""".stripMargin.linesIterator.filterNot(_.trim.isEmpty).mkString("\n")
 
-        val name = m.operationId
-          .getOrElse(m.methodType + p.url.capitalize)
-          .split("[^0-9a-zA-Z$_]")
-          .filter(_.nonEmpty)
-          .zipWithIndex
-          .map { case (part, 0) => part; case (part, _) => part.capitalize }
-          .mkString
+        val name = strippedToCamelCase(m.operationId.getOrElse(m.methodType + p.url.capitalize))
         val maybeTargetFileName = if (useHeadTagForObjectNames) m.tags.flatMap(_.headOption) else None
         val queryParamRefs = m.resolvedParameters
           .collect { case queryParam: OpenapiParameter if queryParam.in == "query" => queryParam.schema }
@@ -217,7 +211,13 @@ class EndpointGenerator {
   }
 
   private def attributes(atts: Map[String, SpecificationExtensionValue]): Option[String] = if (atts.nonEmpty) Some {
-    atts.map { case (k, v) => s""".attribute[${v.tpe}](new AttributeKey[${v.tpe}]("${k}"), ${v.render})""" }.mkString("\n")
+    atts
+      .map { case (k, v) =>
+        val camelCaseK = strippedToCamelCase(k)
+        val uncapitalisedName = camelCaseK.head.toLower + camelCaseK.tail
+        s""".attribute(${uncapitalisedName}ExtensionKey, ${v.render})"""
+      }
+      .mkString("\n")
   }
   else None
 
diff --git a/openapi-codegen/core/src/test/scala/sttp/tapir/codegen/EndpointGeneratorSpec.scala b/openapi-codegen/core/src/test/scala/sttp/tapir/codegen/EndpointGeneratorSpec.scala
index f858a14fb7..b00c584d1e 100644
--- a/openapi-codegen/core/src/test/scala/sttp/tapir/codegen/EndpointGeneratorSpec.scala
+++ b/openapi-codegen/core/src/test/scala/sttp/tapir/codegen/EndpointGeneratorSpec.scala
@@ -259,19 +259,23 @@ class EndpointGeneratorSpec extends CompileCheckTestBase {
       useHeadTagForObjectNames = false,
       jsonSerdeLib = "circe"
     )("TapirGeneratedEndpoints")
+    generatedCode shouldCompile ()
     generatedCode should include(
-      """.attribute[String](new AttributeKey[String]("custom-string-extension-on-path"), "foobar")"""
+      """.attribute(customStringExtensionOnPathExtensionKey, "foobar")"""
     )
     generatedCode should include(
-      """.attribute[String](new AttributeKey[String]("custom-string-extension-on-operation"), "bazquux")"""
+      """.attribute(customStringExtensionOnOperationExtensionKey, "bazquux")"""
     )
     generatedCode should include(
-      """.attribute[Seq[String]](new AttributeKey[Seq[String]]("custom-list-extension-on-operation"), Vector("baz", "quux"))"""
+      """.attribute(customListExtensionOnOperationExtensionKey, Vector("baz", "quux"))"""
     )
     generatedCode should include(
-      """.attribute[Map[String, Any]](new AttributeKey[Map[String, Any]]("custom-map-extension-on-path"), Map("bazkey" -> "bazval", "quuxkey" -> Vector("quux1", "quux2"))"""
+      """.attribute(customMapExtensionOnPathExtensionKey, Map("bazkey" -> "bazval", "quuxkey" -> Vector("quux1", "quux2"))"""
+    )
+    generatedCode should include("""type CustomMapExtensionOnOperationExtension = Map[String, Any]""")
+    generatedCode should include(
+      """val customMapExtensionOnOperationExtensionKey = new sttp.tapir.AttributeKey[CustomMapExtensionOnOperationExtension]("sttp.tapir.generated.TapirGeneratedEndpoints.CustomMapExtensionOnOperationExtension")""".stripMargin
     )
-    generatedCode shouldCompile ()
   }
 
 }