diff --git a/buildSrc/build.gradle.kts b/buildSrc/build.gradle.kts
index b0b098c84..a241cc8c5 100644
--- a/buildSrc/build.gradle.kts
+++ b/buildSrc/build.gradle.kts
@@ -19,4 +19,8 @@ dependencies {
 
 tasks.test {
     useJUnitPlatform()
+    workingDir(layout.projectDirectory)
+    inputs
+        .file(layout.projectDirectory.file("../scripts/detect-breaking-changes"))
+        .withPathSensitivity(PathSensitivity.RELATIVE)
 }
diff --git a/buildSrc/src/test/kotlin/com/openai/gradle/ApiCompatibilityCachePolicyTest.kt b/buildSrc/src/test/kotlin/com/openai/gradle/ApiCompatibilityCachePolicyTest.kt
new file mode 100644
index 000000000..f3de36c55
--- /dev/null
+++ b/buildSrc/src/test/kotlin/com/openai/gradle/ApiCompatibilityCachePolicyTest.kt
@@ -0,0 +1,24 @@
+package com.openai.gradle
+
+import java.nio.file.Path
+import kotlin.io.path.readText
+import kotlin.test.Test
+import kotlin.test.assertContains
+import kotlin.test.assertFalse
+
+class ApiCompatibilityCachePolicyTest {
+    @Test
+    fun `compatibility compilation always executes while production caching stays enabled`() {
+        val detector = Path.of("../scripts/detect-breaking-changes").readText()
+
+        assertFalse(
+            detector.contains("--no-build-cache"),
+            "The API compatibility detector must leave the build cache enabled for production compilation.",
+        )
+        assertContains(detector, "compileExternalApiCompatibilityKotlin")
+        assertContains(detector, "compileProposedApiCompatibilityKotlin")
+        assertContains(detector, "project.tasks.named(taskName).configure")
+        assertContains(detector, "task.outputs.upToDateWhen { false }")
+        assertContains(detector, "task.outputs.doNotCacheIf")
+    }
+}
diff --git a/scripts/detect-breaking-changes b/scripts/detect-breaking-changes
index db524948e..f08f17f26 100755
--- a/scripts/detect-breaking-changes
+++ b/scripts/detect-breaking-changes
@@ -291,6 +291,18 @@ gradle.beforeProject { project ->
                 System.getenv("PROPOSED_FIXTURE_SOURCE_ROOT"),
                 System.getenv("PROPOSED_DEPENDENCIES_FILE")
             )
+
+            [
+                "compileExternalApiCompatibilityKotlin",
+                "compileProposedApiCompatibilityKotlin"
+            ].each { taskName ->
+                project.tasks.named(taskName).configure { task ->
+                    task.outputs.upToDateWhen { false }
+                    task.outputs.doNotCacheIf(
+                        "API compatibility compilation must always execute"
+                    ) { true }
+                }
+            }
         }
     }
 }
@@ -305,8 +317,7 @@ GENERATED_TEST_SOURCE_ROOT="${GENERATED_TEST_SOURCE_ROOT}" \
     ./scripts/gradle \
     --init-script "${COMPATIBILITY_INIT_SCRIPT}" \
     :openai-java-core:compileExternalApiCompatibilityKotlin \
-    :openai-java-core:compileProposedApiCompatibilityKotlin \
-    --no-build-cache
+    :openai-java-core:compileProposedApiCompatibilityKotlin
 
 validate_public_api_signatures() {
     local manifest_path="$1"