diff --git a/build/bom/pom.xml b/build/bom/pom.xml
index 7dabb801a7d..0e68a2d543c 100644
--- a/build/bom/pom.xml
+++ b/build/bom/pom.xml
@@ -346,17 +346,6 @@
         <version>${version.ai.timefold.solver}</version>
         <classifier>sources</classifier>
       </dependency>
-      <dependency>
-        <groupId>ai.timefold.solver</groupId>
-        <artifactId>timefold-solver-model-rest-definition</artifactId>
-        <version>${version.ai.timefold.solver}</version>
-      </dependency>
-      <dependency>
-        <groupId>ai.timefold.solver</groupId>
-        <artifactId>timefold-solver-model-rest-definition</artifactId>
-        <version>${version.ai.timefold.solver}</version>
-        <classifier>sources</classifier>
-      </dependency>
       <dependency>
         <groupId>ai.timefold.solver</groupId>
         <artifactId>timefold-solver-model-rest</artifactId>
diff --git a/model/rest-definition/src/main/java/ai/timefold/solver/model/rest/definition/api/DatasetSelector.java b/model/definition/src/main/java/ai/timefold/solver/model/definition/api/rest/DatasetSelector.java
similarity index 69%
rename from model/rest-definition/src/main/java/ai/timefold/solver/model/rest/definition/api/DatasetSelector.java
rename to model/definition/src/main/java/ai/timefold/solver/model/definition/api/rest/DatasetSelector.java
index fd726b3d60d..04c1599e560 100644
--- a/model/rest-definition/src/main/java/ai/timefold/solver/model/rest/definition/api/DatasetSelector.java
+++ b/model/definition/src/main/java/ai/timefold/solver/model/definition/api/rest/DatasetSelector.java
@@ -1,4 +1,4 @@
-package ai.timefold.solver.model.rest.definition.api;
+package ai.timefold.solver.model.definition.api.rest;
 
 public enum DatasetSelector {
 
diff --git a/model/rest-definition/src/main/java/ai/timefold/solver/model/rest/definition/api/OperationId.java b/model/definition/src/main/java/ai/timefold/solver/model/definition/api/rest/OperationId.java
similarity index 96%
rename from model/rest-definition/src/main/java/ai/timefold/solver/model/rest/definition/api/OperationId.java
rename to model/definition/src/main/java/ai/timefold/solver/model/definition/api/rest/OperationId.java
index 850c823ddb8..f67503f7cd5 100644
--- a/model/rest-definition/src/main/java/ai/timefold/solver/model/rest/definition/api/OperationId.java
+++ b/model/definition/src/main/java/ai/timefold/solver/model/definition/api/rest/OperationId.java
@@ -1,4 +1,4 @@
-package ai.timefold.solver.model.rest.definition.api;
+package ai.timefold.solver.model.definition.api.rest;
 
 public final class OperationId {
 
diff --git a/model/rest-definition/src/main/java/ai/timefold/solver/model/rest/definition/api/OperationOnPost.java b/model/definition/src/main/java/ai/timefold/solver/model/definition/api/rest/OperationOnPost.java
similarity index 68%
rename from model/rest-definition/src/main/java/ai/timefold/solver/model/rest/definition/api/OperationOnPost.java
rename to model/definition/src/main/java/ai/timefold/solver/model/definition/api/rest/OperationOnPost.java
index e6122a8cbcc..6f8e6b5b9dc 100644
--- a/model/rest-definition/src/main/java/ai/timefold/solver/model/rest/definition/api/OperationOnPost.java
+++ b/model/definition/src/main/java/ai/timefold/solver/model/definition/api/rest/OperationOnPost.java
@@ -1,4 +1,4 @@
-package ai.timefold.solver.model.rest.definition.api;
+package ai.timefold.solver.model.definition.api.rest;
 
 public enum OperationOnPost {
     NONE,
diff --git a/model/pom.xml b/model/pom.xml
index 6a50e1d1f4a..7fbaac32e68 100644
--- a/model/pom.xml
+++ b/model/pom.xml
@@ -35,7 +35,6 @@
     <module>facade/model</module>
     <module>facade/model-with-maps</module>
     <module>facade/model-parent</module>
-    <module>rest-definition</module>
     <module>model-defaults</module>
     <module>tools/maven-plugin</module>
   </modules>
diff --git a/model/quarkus/deployment/src/main/java/ai/timefold/solver/model/quarkus/deployment/TimefoldModelDescriptorProcessor.java b/model/quarkus/deployment/src/main/java/ai/timefold/solver/model/quarkus/deployment/TimefoldModelDescriptorProcessor.java
index b042e9fb446..4e6faa02c35 100644
--- a/model/quarkus/deployment/src/main/java/ai/timefold/solver/model/quarkus/deployment/TimefoldModelDescriptorProcessor.java
+++ b/model/quarkus/deployment/src/main/java/ai/timefold/solver/model/quarkus/deployment/TimefoldModelDescriptorProcessor.java
@@ -1,7 +1,7 @@
 package ai.timefold.solver.model.quarkus.deployment;
 
+import static ai.timefold.solver.model.definition.api.rest.OperationId.POST_OPERATIONS_ID_PATTERN;
 import static ai.timefold.solver.model.quarkus.deployment.util.ProcessorUtils.excludeType;
-import static ai.timefold.solver.model.rest.definition.api.OperationId.POST_OPERATIONS_ID_PATTERN;
 
 import java.io.IOException;
 import java.io.UncheckedIOException;
@@ -47,6 +47,7 @@
 import ai.timefold.solver.model.definition.api.domain.ConstraintReference;
 import ai.timefold.solver.model.definition.api.domain.DataFormat;
 import ai.timefold.solver.model.definition.api.domain.ModelRequest;
+import ai.timefold.solver.model.definition.api.rest.OperationId;
 import ai.timefold.solver.model.definition.internal.descriptor.ConstraintDescriptor;
 import ai.timefold.solver.model.definition.internal.descriptor.ConstraintGroupDescriptor;
 import ai.timefold.solver.model.definition.internal.descriptor.DocumentationDescriptor;
@@ -68,7 +69,6 @@
 import ai.timefold.solver.model.quarkus.deployment.descriptor.DefaultConstraintGroupDescriptorFactory;
 import ai.timefold.solver.model.quarkus.deployment.openapi.SchemaPostProcessor;
 import ai.timefold.solver.model.quarkus.deployment.openapi.SchemaUtils;
-import ai.timefold.solver.model.rest.definition.api.OperationId;
 
 import org.apache.commons.lang3.exception.UncheckedException;
 import org.eclipse.microprofile.config.Config;
diff --git a/model/rest-definition/pom.xml b/model/rest-definition/pom.xml
deleted file mode 100644
index 44a8a57cb1a..00000000000
--- a/model/rest-definition/pom.xml
+++ /dev/null
@@ -1,48 +0,0 @@
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
-  <modelVersion>4.0.0</modelVersion>
-  <parent>
-    <groupId>ai.timefold.solver</groupId>
-    <artifactId>timefold-solver-model-internal-parent</artifactId>
-    <version>${revision}</version>
-    <relativePath>../pom.xml</relativePath>
-  </parent>
-
-  <artifactId>timefold-solver-model-rest-definition</artifactId>
-  <name>(Preview) Timefold Solver Model REST definition</name>
-  <description>
-    This module contains REST API types definitions.
-    This module is in a preview state and thus is a subject to changes.
-  </description>
-
-  <dependencies>
-    <dependency>
-      <groupId>ai.timefold.solver</groupId>
-      <artifactId>timefold-solver-model-definition</artifactId>
-    </dependency>
-    <dependency>
-      <groupId>io.quarkus</groupId>
-      <artifactId>quarkus-rest-jackson</artifactId>
-    </dependency>
-
-    <dependency>
-      <groupId>org.junit.jupiter</groupId>
-      <artifactId>junit-jupiter-api</artifactId>
-      <scope>test</scope>
-    </dependency>
-    <dependency>
-      <groupId>org.assertj</groupId>
-      <artifactId>assertj-core</artifactId>
-      <scope>test</scope>
-    </dependency>
-  </dependencies>
-
-  <build>
-    <plugins>
-      <plugin>
-        <groupId>io.smallrye</groupId>
-        <artifactId>jandex-maven-plugin</artifactId>
-      </plugin>
-    </plugins>
-  </build>
-</project>
diff --git a/model/rest/pom.xml b/model/rest/pom.xml
index e8ed1e2af35..ae9cd7e246d 100644
--- a/model/rest/pom.xml
+++ b/model/rest/pom.xml
@@ -23,10 +23,6 @@
       <groupId>ai.timefold.solver</groupId>
       <artifactId>timefold-solver-model-json</artifactId>
     </dependency>
-    <dependency>
-      <groupId>ai.timefold.solver</groupId>
-      <artifactId>timefold-solver-model-rest-definition</artifactId>
-    </dependency>
     <dependency>
       <groupId>io.quarkus</groupId>
       <artifactId>quarkus-rest-jackson</artifactId>
diff --git a/model/rest/src/main/java/ai/timefold/solver/model/rest/impl/AbstractModelAPIResource.java b/model/rest/src/main/java/ai/timefold/solver/model/rest/impl/AbstractModelAPIResource.java
index ef7f83f0064..e85cab63e35 100644
--- a/model/rest/src/main/java/ai/timefold/solver/model/rest/impl/AbstractModelAPIResource.java
+++ b/model/rest/src/main/java/ai/timefold/solver/model/rest/impl/AbstractModelAPIResource.java
@@ -43,6 +43,9 @@
 import ai.timefold.solver.model.definition.api.log.LogInfo;
 import ai.timefold.solver.model.definition.api.metrics.ModelInputMetrics;
 import ai.timefold.solver.model.definition.api.metrics.ModelOutputMetrics;
+import ai.timefold.solver.model.definition.api.rest.DatasetSelector;
+import ai.timefold.solver.model.definition.api.rest.OperationId;
+import ai.timefold.solver.model.definition.api.rest.OperationOnPost;
 import ai.timefold.solver.model.definition.api.validation.Issue;
 import ai.timefold.solver.model.definition.api.validation.IssueCode;
 import ai.timefold.solver.model.definition.api.validation.ModelValidator;
@@ -62,9 +65,6 @@
 import ai.timefold.solver.model.definition.internal.events.SolverChannels;
 import ai.timefold.solver.model.definition.internal.storage.AbstractStorageService;
 import ai.timefold.solver.model.json.internal.patch.JsonPatch;
-import ai.timefold.solver.model.rest.definition.api.DatasetSelector;
-import ai.timefold.solver.model.rest.definition.api.OperationId;
-import ai.timefold.solver.model.rest.definition.api.OperationOnPost;
 
 import org.eclipse.microprofile.openapi.annotations.Operation;
 import org.eclipse.microprofile.openapi.annotations.enums.SchemaType;
diff --git a/model/test-model/src/test/java/ai/timefold/solver/model/testmodel/EmployeeScheduleResourceTest.java b/model/test-model/src/test/java/ai/timefold/solver/model/testmodel/EmployeeScheduleResourceTest.java
index f0762ed4279..a3deb471ffa 100644
--- a/model/test-model/src/test/java/ai/timefold/solver/model/testmodel/EmployeeScheduleResourceTest.java
+++ b/model/test-model/src/test/java/ai/timefold/solver/model/testmodel/EmployeeScheduleResourceTest.java
@@ -43,7 +43,7 @@
 import ai.timefold.solver.model.definition.internal.events.InitSolutionEvent;
 import ai.timefold.solver.model.definition.internal.events.SolverChannels;
 import ai.timefold.solver.model.quarkus.deployment.defaults.EmptyModelConfigOverrides;
-import ai.timefold.solver.model.rest.definition.api.OperationOnPost;
+import ai.timefold.solver.model.definition.api.rest.OperationOnPost;
 import ai.timefold.solver.model.testmodel.domain.Employee;
 import ai.timefold.solver.model.testmodel.domain.EmployeeSchedule;
 import ai.timefold.solver.model.testmodel.domain.Shift;
diff --git a/model/test-model/src/test/java/ai/timefold/solver/model/testmodel/OpenApiTest.java b/model/test-model/src/test/java/ai/timefold/solver/model/testmodel/OpenApiTest.java
index fccee069c79..8cecdeb766c 100644
--- a/model/test-model/src/test/java/ai/timefold/solver/model/testmodel/OpenApiTest.java
+++ b/model/test-model/src/test/java/ai/timefold/solver/model/testmodel/OpenApiTest.java
@@ -12,7 +12,7 @@
 import java.util.List;
 import java.util.Optional;
 
-import ai.timefold.solver.model.rest.definition.api.OperationId;
+import ai.timefold.solver.model.definition.api.rest.OperationId;
 
 import org.eclipse.microprofile.config.inject.ConfigProperty;
 import org.eclipse.microprofile.openapi.models.OpenAPI;