diff --git a/tests/integration/test_api_endpoints.py b/tests/integration/test_api_endpoints.py
index 869928fe..6c28e51c 100644
--- a/tests/integration/test_api_endpoints.py
+++ b/tests/integration/test_api_endpoints.py
@@ -204,6 +204,144 @@ async def test_upload_and_search_endpoint(tmp_path: Path, disable_langflow_inges
             pass
 
 
+@pytest.mark.asyncio
+async def test_search_multi_embedding_models(
+    tmp_path: Path, monkeypatch: pytest.MonkeyPatch
+):
+    """Ensure /search fans out across multiple embedding models when present."""
+    os.environ["DISABLE_INGEST_WITH_LANGFLOW"] = "true"
+    os.environ["DISABLE_STARTUP_INGEST"] = "true"
+    os.environ["GOOGLE_OAUTH_CLIENT_ID"] = ""
+    os.environ["GOOGLE_OAUTH_CLIENT_SECRET"] = ""
+
+    import sys
+
+    for mod in [
+        "src.api.router",
+        "api.router",
+        "src.api.connector_router",
+        "api.connector_router",
+        "src.config.settings",
+        "config.settings",
+        "src.auth_middleware",
+        "auth_middleware",
+        "src.main",
+        "services.search_service",
+        "src.services.search_service",
+    ]:
+        sys.modules.pop(mod, None)
+
+    from src.main import create_app, startup_tasks
+    from src.config.settings import clients, INDEX_NAME
+    from src.config.config_manager import config_manager
+
+    await clients.initialize()
+    try:
+        await clients.opensearch.indices.delete(index=INDEX_NAME)
+        await asyncio.sleep(1)
+    except Exception:
+        pass
+
+    app = await create_app()
+    await startup_tasks(app.state.services)
+
+    # Mark configuration as edited so /settings accepts updates
+    config = config_manager.get_config()
+    config.edited = True
+
+    from src.main import _ensure_opensearch_index
+
+    await _ensure_opensearch_index()
+
+    transport = httpx.ASGITransport(app=app)
+
+    try:
+        async with httpx.AsyncClient(transport=transport, base_url="http://testserver") as client:
+            await wait_for_service_ready(client)
+
+            async def _upload_doc(name: str, text: str) -> None:
+                file_path = tmp_path / name
+                file_path.write_text(text)
+                files = {
+                    "file": (
+                        name,
+                        file_path.read_bytes(),
+                        "text/markdown",
+                    )
+                }
+                resp = await client.post("/upload", files=files)
+                assert resp.status_code == 201, resp.text
+
+            async def _wait_for_models(expected_models: set[str], query: str = "physics"):
+                deadline = asyncio.get_event_loop().time() + 30.0
+                last_payload = None
+                while asyncio.get_event_loop().time() < deadline:
+                    resp = await client.post(
+                        "/search",
+                        json={"query": query, "limit": 10, "scoreThreshold": 0},
+                    )
+                    if resp.status_code != 200:
+                        last_payload = resp.text
+                        await asyncio.sleep(0.5)
+                        continue
+                    payload = resp.json()
+                    buckets = (
+                        payload.get("aggregations", {})
+                        .get("embedding_models", {})
+                        .get("buckets", [])
+                    )
+                    models = {b.get("key") for b in buckets if b.get("key")}
+                    if expected_models <= models:
+                        return payload
+                    last_payload = payload
+                    await asyncio.sleep(0.5)
+                raise AssertionError(
+                    f"Embedding models not detected. Last payload: {last_payload}"
+                )
+
+            # Start with explicit small embedding model
+            resp = await client.post(
+                "/settings",
+                json={"embedding_model": "text-embedding-3-small"},
+            )
+            assert resp.status_code == 200, resp.text
+
+            # Ingest first document (small model)
+            await _upload_doc("doc-small.md", "Physics basics and fundamental principles.")
+            payload_small = await _wait_for_models({"text-embedding-3-small"})
+            result_models_small = {r.get("embedding_model") for r in payload_small.get("results", []) if r.get("embedding_model")}
+            assert "text-embedding-3-small" in result_models_small or not result_models_small
+
+            # Update embedding model via settings
+            resp = await client.post(
+                "/settings",
+                json={"embedding_model": "text-embedding-3-large"},
+            )
+            assert resp.status_code == 200, resp.text
+
+            # Ingest second document which should use the large embedding model
+            await _upload_doc("doc-large.md", "Advanced physics covers quantum topics extensively.")
+
+            payload = await _wait_for_models({"text-embedding-3-small", "text-embedding-3-large"})
+            buckets = payload.get("aggregations", {}).get("embedding_models", {}).get("buckets", [])
+            models = {b.get("key") for b in buckets}
+            assert {"text-embedding-3-small", "text-embedding-3-large"} <= models
+
+            result_models = {
+                r.get("embedding_model")
+                for r in payload.get("results", [])
+                if r.get("embedding_model")
+            }
+            assert {"text-embedding-3-small", "text-embedding-3-large"} <= result_models
+    finally:
+        from src.config.settings import clients
+
+        try:
+            await clients.close()
+        except Exception:
+            pass
+
+
 @pytest.mark.parametrize("disable_langflow_ingest", [True, False])
 @pytest.mark.asyncio
 async def test_router_upload_ingest_traditional(tmp_path: Path, disable_langflow_ingest: bool):