diff --git a/incubator/binding-openapi/src/main/java/io/aklivity/zilla/runtime/binding/openapi/internal/config/OpenapiClientNamespaceGenerator.java b/incubator/binding-openapi/src/main/java/io/aklivity/zilla/runtime/binding/openapi/internal/config/OpenapiClientNamespaceGenerator.java
index 1b8e5cd33d..af7c0344b2 100644
--- a/incubator/binding-openapi/src/main/java/io/aklivity/zilla/runtime/binding/openapi/internal/config/OpenapiClientNamespaceGenerator.java
+++ b/incubator/binding-openapi/src/main/java/io/aklivity/zilla/runtime/binding/openapi/internal/config/OpenapiClientNamespaceGenerator.java
@@ -31,6 +31,7 @@
 import io.aklivity.zilla.runtime.binding.openapi.internal.model.OpenapiHeader;
 import io.aklivity.zilla.runtime.binding.openapi.internal.model.OpenapiResponse;
 import io.aklivity.zilla.runtime.binding.openapi.internal.model.OpenapiResponseByContentType;
+import io.aklivity.zilla.runtime.binding.openapi.internal.model.OpenapiSchema;
 import io.aklivity.zilla.runtime.binding.openapi.internal.view.OpenapiOperationView;
 import io.aklivity.zilla.runtime.binding.openapi.internal.view.OpenapiOperationsView;
 import io.aklivity.zilla.runtime.binding.openapi.internal.view.OpenapiPathView;
@@ -173,7 +174,10 @@ private <C> HttpResponseConfigBuilder<C> injectResponseHeaders(
             for (Map.Entry<String, OpenapiHeader> header : responses.headers.entrySet())
             {
                 String name = header.getKey();
-                ModelConfig model = models.get(header.getValue().schema.type);
+                OpenapiSchema schema = header.getValue().schema;
+                String modelName = schema.format != null ? String.format("%s:%s", schema.type, schema.format) :
+                        schema.type;
+                ModelConfig model = models.get(modelName);
                 if (model != null)
                 {
                     response
diff --git a/incubator/binding-openapi/src/main/java/io/aklivity/zilla/runtime/binding/openapi/internal/config/OpenapiNamespaceGenerator.java b/incubator/binding-openapi/src/main/java/io/aklivity/zilla/runtime/binding/openapi/internal/config/OpenapiNamespaceGenerator.java
index a74fa0d0c5..9ed52ad14f 100644
--- a/incubator/binding-openapi/src/main/java/io/aklivity/zilla/runtime/binding/openapi/internal/config/OpenapiNamespaceGenerator.java
+++ b/incubator/binding-openapi/src/main/java/io/aklivity/zilla/runtime/binding/openapi/internal/config/OpenapiNamespaceGenerator.java
@@ -39,6 +39,7 @@
 import io.aklivity.zilla.runtime.engine.config.NamespaceConfigBuilder;
 import io.aklivity.zilla.runtime.engine.config.TelemetryRefConfigBuilder;
 import io.aklivity.zilla.runtime.model.core.config.Int32ModelConfig;
+import io.aklivity.zilla.runtime.model.core.config.Int64ModelConfig;
 import io.aklivity.zilla.runtime.model.core.config.StringModelConfig;
 
 public abstract class OpenapiNamespaceGenerator
@@ -52,7 +53,9 @@ public abstract class OpenapiNamespaceGenerator
     protected final Matcher jsonContentType = JSON_CONTENT_TYPE.matcher("");
     protected final Map<String, ModelConfig> models = Map.of(
         "string", StringModelConfig.builder().build(),
-        "integer", Int32ModelConfig.builder().build()
+        "integer", Int32ModelConfig.builder().build(),
+        "integer:int32", Int32ModelConfig.builder().build(),
+        "integer:int64", Int64ModelConfig.builder().build()
     );
 
     public abstract NamespaceConfig generate(
diff --git a/incubator/binding-openapi/src/main/java/io/aklivity/zilla/runtime/binding/openapi/internal/config/OpenapiServerNamespaceGenerator.java b/incubator/binding-openapi/src/main/java/io/aklivity/zilla/runtime/binding/openapi/internal/config/OpenapiServerNamespaceGenerator.java
index 5900ba8e8c..907d354d95 100644
--- a/incubator/binding-openapi/src/main/java/io/aklivity/zilla/runtime/binding/openapi/internal/config/OpenapiServerNamespaceGenerator.java
+++ b/incubator/binding-openapi/src/main/java/io/aklivity/zilla/runtime/binding/openapi/internal/config/OpenapiServerNamespaceGenerator.java
@@ -226,7 +226,10 @@ private <C> HttpRequestConfigBuilder<C> injectParams(
             {
                 if (parameter.schema != null && parameter.schema.type != null)
                 {
-                    ModelConfig model = models.get(parameter.schema.type);
+                    OpenapiSchema schema = parameter.schema;
+                    String modelName = schema.format != null ? String.format("%s:%s", schema.type, schema.format) :
+                        schema.type;
+                    ModelConfig model = models.get(modelName);
                     if (model != null)
                     {
                         switch (parameter.in)