diff --git a/scripts/download-oas.sh b/scripts/download-oas.sh
index 0d62d8d..a226a1f 100755
--- a/scripts/download-oas.sh
+++ b/scripts/download-oas.sh
@@ -57,6 +57,7 @@ EOF
 	fi
 	cd ${work_dir}/${OAS_REPO_NAME} >/dev/null
 	git checkout -q $apiVersion || (echo "version ${apiVersion} does not exist, using main instead" && git checkout -q main)
+	echo "$service=$(git rev-parse HEAD)" >> oas_commits
 	cd - >/dev/null
 
 	# Prioritize GA over Beta over Alpha versions
@@ -121,3 +122,4 @@ EOF
 	fi
 	mv -f ${max_version_dir}/*.json ${ROOT_DIR}/oas
 done
+mv -f ${work_dir}/${OAS_REPO_NAME}/oas_commits ${ROOT_DIR}/oas/oas_commits
\ No newline at end of file
diff --git a/scripts/generate-sdk/languages/go.sh b/scripts/generate-sdk/languages/go.sh
index cc11165..97c3eee 100644
--- a/scripts/generate-sdk/languages/go.sh
+++ b/scripts/generate-sdk/languages/go.sh
@@ -216,6 +216,12 @@ generate_go_sdk() {
             cp -r "${sdk_services_backup_dir}/${service}/VERSION" "${SERVICES_FOLDER}/${service}/VERSION"
         fi
 
+        # If the service has oas_commit file, move it inside the service folder
+        if [ -f "${sdk_services_backup_dir}/${service}/oas_commit" ]; then
+            echo "Found ${service} \"oas_commit\" file"
+            cp -r "${sdk_services_backup_dir}/${service}/oas_commit" "${SERVICES_FOLDER}/${service}/oas_commit"
+        fi
+
         cd "${SERVICES_FOLDER}/${service}"
         go work use .
         # Make sure that dependencies are uptodate
diff --git a/scripts/generate-sdk/languages/java.sh b/scripts/generate-sdk/languages/java.sh
index 0c19407..62da43f 100644
--- a/scripts/generate-sdk/languages/java.sh
+++ b/scripts/generate-sdk/languages/java.sh
@@ -180,6 +180,12 @@ generate_java_sdk() {
             cp -r "${sdk_services_backup_dir}/${service}/VERSION" "${SERVICES_FOLDER}/${service}/VERSION"
         fi
 
+        # If the service has oas_commit file, move it inside the service folder
+        if [ -f "${sdk_services_backup_dir}/${service}/oas_commit" ]; then
+            echo "Found ${service} \"oas_commit\" file"
+            cp -r "${sdk_services_backup_dir}/${service}/oas_commit" "${SERVICES_FOLDER}/${service}/oas_commit"
+        fi
+
     done
 
     cd "${SDK_REPO_LOCAL_PATH}"
diff --git a/scripts/generate-sdk/languages/python.sh b/scripts/generate-sdk/languages/python.sh
index 330baee..d476cd0 100644
--- a/scripts/generate-sdk/languages/python.sh
+++ b/scripts/generate-sdk/languages/python.sh
@@ -170,6 +170,12 @@ generate_python_sdk() {
             cp -r "${sdk_services_backup_dir}/${service}/NOTICE.txt" "${SERVICES_FOLDER}/${service}/NOTICE.txt"
         fi
 
+        # If the service has oas_commit file, move it inside the service folder
+        if [ -f "${sdk_services_backup_dir}/${service}/oas_commit" ]; then
+            echo "Found ${service} \"oas_commit\" file"
+            cp -r "${sdk_services_backup_dir}/${service}/oas_commit" "${SERVICES_FOLDER}/${service}/oas_commit"
+        fi
+
         cd "${SERVICES_FOLDER}/${service}"
         # Run formatter
         isort .
diff --git a/scripts/sdk-create-pr.sh b/scripts/sdk-create-pr.sh
index 6c103a0..6c0ea36 100755
--- a/scripts/sdk-create-pr.sh
+++ b/scripts/sdk-create-pr.sh
@@ -119,6 +119,17 @@ for service_path in ${work_dir}/sdk_to_push/services/*; do
             fi
         fi
 
+        # write OAS commit hash of service into source tree, create compare link
+        old_commit=$(cat "services/${service}/oas_commit")
+        new_commit=$(grep "${service}=" "${ROOT_DIR}/oas/oas_commits" | cut -d = -f 2)
+        compare_link=""
+        if [[ -n "${old_commit}" ]] && [[ -n "${new_commit}" ]]; then
+          compare_link=https://github.com/stackitcloud/stackit-api-specifications/compare/${old_commit}...${new_commit}
+        fi
+        if [[ -n "${new_commit}" ]]; then
+          echo "${new_commit}" > "services/${service}/oas_commit"
+        fi
+
         git add "services/${service}/"
         if [ "${LANGUAGE}" == "go" ] && [ ! -d "${work_dir}/sdk_backup/services/${service}/" ]; then # Check if it is a newly added SDK module
             git add go.work
@@ -128,7 +139,7 @@ for service_path in ${work_dir}/sdk_to_push/services/*; do
             echo ">> Creating PR for $service"
             git commit -m "Generate $service"
             git push origin "$branch"
-            gh pr create --title "Generator: Update SDK /services/$service" --body "$COMMIT_INFO" --head "$branch" --base "main"
+            echo -e "$COMMIT_INFO\nspec comparison: ${compare_link}" | gh pr create --title "Generator: Update SDK /services/$service" --body-file - --head "$branch" --base "main"
         else
             echo ">> Pushing changes for $service service..."
             git commit -m "Generate $service: $COMMIT_INFO"