diff --git a/src/sentry/api/endpoints/organization_artifactbundle_assemble.py b/src/sentry/api/endpoints/organization_artifactbundle_assemble.py
index 33dabcee3ec8ac..669b22f7828d74 100644
--- a/src/sentry/api/endpoints/organization_artifactbundle_assemble.py
+++ b/src/sentry/api/endpoints/organization_artifactbundle_assemble.py
@@ -1,5 +1,6 @@
 import jsonschema
 import orjson
+from django.db.models import Q
 from rest_framework.request import Request
 from rest_framework.response import Response
 
@@ -56,16 +57,26 @@ def post(self, request: Request, organization) -> Response:
         except Exception:
             return Response({"error": "Invalid json body"}, status=400)
 
-        projects = set(data.get("projects", []))
-        if len(projects) == 0:
+        input_projects = data.get("projects", [])
+        if len(input_projects) == 0:
             return Response({"error": "You need to specify at least one project"}, status=400)
 
-        project_ids = list(
-            Project.objects.filter(
-                organization=organization, status=ObjectStatus.ACTIVE, slug__in=projects
-            ).values_list("id", flat=True)
-        )
-        if len(project_ids) != len(projects):
+        input_project_slug = set()
+        input_project_id = set()
+        for project in input_projects:
+            # IDs are always numeric, slugs cannot be numeric
+            if str(project).isdecimal():
+                input_project_id.add(project)
+            else:
+                input_project_slug.add(project)
+
+        project_ids = Project.objects.filter(
+            (Q(id__in=input_project_id) | Q(slug__in=input_project_slug)),
+            organization=organization,
+            status=ObjectStatus.ACTIVE,
+        ).values_list("id", flat=True)
+
+        if len(project_ids) != len(input_projects):
             return Response({"error": "One or more projects are invalid"}, status=400)
 
         if not self.has_release_permission(request, organization, project_ids=set(project_ids)):
@@ -131,6 +142,6 @@ def post(self, request: Request, organization) -> Response:
         )
 
         if is_org_auth_token_auth(request.auth):
-            update_org_auth_token_last_used(request.auth, project_ids)
+            update_org_auth_token_last_used(request.auth, list(project_ids))
 
         return Response({"state": ChunkFileState.CREATED, "missingChunks": []}, status=200)
diff --git a/tests/sentry/api/endpoints/test_organization_artifactbundle_assemble.py b/tests/sentry/api/endpoints/test_organization_artifactbundle_assemble.py
index ba0761e18e7cde..4fe8b0285820c0 100644
--- a/tests/sentry/api/endpoints/test_organization_artifactbundle_assemble.py
+++ b/tests/sentry/api/endpoints/test_organization_artifactbundle_assemble.py
@@ -141,6 +141,86 @@ def test_assemble_with_invalid_projects(self):
         assert response.status_code == 400, response.content
         assert response.data["error"] == "One or more projects are invalid"
 
+    def test_assemble_with_valid_project_slugs(self):
+        # Test with all valid project slugs
+        valid_project = self.create_project()
+        another_valid_project = self.create_project()
+
+        bundle_file = self.create_artifact_bundle_zip(
+            org=self.organization.slug, release=self.release.version
+        )
+        total_checksum = sha1(bundle_file).hexdigest()
+
+        blob = FileBlob.from_file(ContentFile(bundle_file))
+        FileBlobOwner.objects.get_or_create(organization_id=self.organization.id, blob=blob)
+
+        response = self.client.post(
+            self.url,
+            data={
+                "checksum": total_checksum,
+                "chunks": [blob.checksum],
+                "projects": [valid_project.slug, another_valid_project.slug],
+            },
+            HTTP_AUTHORIZATION=f"Bearer {self.token.token}",
+        )
+
+        self.assertEqual(response.status_code, 200)
+
+    def test_assemble_with_valid_project_ids(self):
+        # Test with all valid project IDs
+        valid_project = self.create_project()
+        another_valid_project = self.create_project()
+
+        bundle_file = self.create_artifact_bundle_zip(
+            org=self.organization.slug, release=self.release.version
+        )
+        total_checksum = sha1(bundle_file).hexdigest()
+
+        blob = FileBlob.from_file(ContentFile(bundle_file))
+        FileBlobOwner.objects.get_or_create(organization_id=self.organization.id, blob=blob)
+
+        response = self.client.post(
+            self.url,
+            data={
+                "checksum": total_checksum,
+                "chunks": [blob.checksum],
+                "projects": [str(valid_project.id), str(another_valid_project.id)],
+            },
+            HTTP_AUTHORIZATION=f"Bearer {self.token.token}",
+        )
+
+        self.assertEqual(response.status_code, 200)
+
+    def test_assemble_with_mix_of_slugs_and_ids(self):
+        # Test with a mix of valid project slugs and IDs
+        valid_project = self.create_project()
+        another_valid_project = self.create_project()
+        third_valid_project = self.create_project()
+
+        bundle_file = self.create_artifact_bundle_zip(
+            org=self.organization.slug, release=self.release.version
+        )
+        total_checksum = sha1(bundle_file).hexdigest()
+
+        blob = FileBlob.from_file(ContentFile(bundle_file))
+        FileBlobOwner.objects.get_or_create(organization_id=self.organization.id, blob=blob)
+
+        response = self.client.post(
+            self.url,
+            data={
+                "checksum": total_checksum,
+                "chunks": [blob.checksum],
+                "projects": [
+                    valid_project.slug,
+                    str(another_valid_project.id),
+                    str(third_valid_project.id),
+                ],
+            },
+            HTTP_AUTHORIZATION=f"Bearer {self.token.token}",
+        )
+
+        self.assertEqual(response.status_code, 200)
+
     @patch("sentry.tasks.assemble.assemble_artifacts")
     def test_assemble_without_version_and_dist(self, mock_assemble_artifacts):
         bundle_file = self.create_artifact_bundle_zip(