diff --git a/examples/agentic_vectorless_rag_demo.py b/examples/agentic_vectorless_rag_demo.py
index bb11cfd..c8d0674 100644
--- a/examples/agentic_vectorless_rag_demo.py
+++ b/examples/agentic_vectorless_rag_demo.py
@@ -24,7 +24,7 @@ import requests
 
 sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
-from agents import Agent, Runner, function_tool
+from agents import Agent, Runner, function_tool, set_tracing_disabled
 from agents.model_settings import ModelSettings
 from agents.stream_events import RawResponsesStreamEvent, RunItemStreamEvent
 from openai.types.responses import ResponseTextDeltaEvent, ResponseReasoningSummaryTextDeltaEvent
@@ -135,6 +135,8 @@ def query_agent(client: PageIndexClient, doc_id: str, prompt: str, verbose: bool
 
 if __name__ == "__main__":
 
+    set_tracing_disabled(True)
+
     # Download PDF if needed
     if not os.path.exists(PDF_PATH):
         print(f"Downloading {PDF_URL} ...")
diff --git a/pageindex/client.py b/pageindex/client.py
index f798bcf..894dab1 100644
--- a/pageindex/client.py
+++ b/pageindex/client.py
@@ -15,6 +15,16 @@ from .utils import ConfigLoader, remove_fields
 META_INDEX = "_meta.json"
 
 
+def _normalize_retrieve_model(model: str) -> str:
+    """Preserve supported Agents SDK prefixes and route other provider paths via LiteLLM."""
+    passthrough_prefixes = ("litellm/", "openai/")
+    if not model or "/" not in model:
+        return model
+    if model.startswith(passthrough_prefixes):
+        return model
+    return f"litellm/{model}"
+
+
 class PageIndexClient:
     """
     A client for indexing and retrieving document content.
@@ -35,7 +45,7 @@ class PageIndexClient:
             overrides["retrieve_model"] = retrieve_model
         opt = ConfigLoader().load(overrides or None)
         self.model = opt.model
-        self.retrieve_model = opt.retrieve_model or self.model
+        self.retrieve_model = _normalize_retrieve_model(opt.retrieve_model or self.model)
         if self.workspace:
             self.workspace.mkdir(parents=True, exist_ok=True)
         self.documents = {}
diff --git a/pageindex/config.yaml b/pageindex/config.yaml
index 468172b..591fe93 100644
--- a/pageindex/config.yaml
+++ b/pageindex/config.yaml
@@ -1,6 +1,6 @@
 model: "gpt-4o-2024-11-20"
 # model: "anthropic/claude-sonnet-4-6"
-retrieve_model: "gpt-5.4"  # defaults to model if not set
+retrieve_model: "gpt-5.4"  # defaults to `model` if not set
 toc_check_page_num: 20
 max_page_num_each_node: 10
 max_token_num_each_node: 20000