/rag/query

RAG Query endpoint: Search Vector Store → (Rerank) → LLM Completion

Feature	Supported
Logging	Yes
Streaming	Yes
Reranking	Yes (optional)
Supported Providers	openai, bedrock, vertex_ai

Quick Start

RAG Query with OpenAI

curl -X POST "http://localhost:4000/v1/rag/query" \
    -H "Authorization: Bearer sk-1234" \
    -H "Content-Type: application/json" \
    -d '{
        "model": "gpt-4o-mini",
        "messages": [{"role": "user", "content": "What is LiteLLM?"}],
        "retrieval_config": {
            "vector_store_id": "vs_abc123",
            "custom_llm_provider": "openai",
            "top_k": 5
        }
    }'

How It Works

The RAG query endpoint performs the following steps:

1. Extract Query: Extracts the query text from the last user message
2. Search Vector Store: Searches the specified vector store for relevant context
3. Rerank (Optional): Reranks the search results using a reranking model
4. Generate Response: Calls the LLM with the retrieved context prepended to the messages

Response

The response follows the standard OpenAI chat completion format, with additional search metadata:

{
  "id": "chatcmpl-abc123",
  "object": "chat.completion",
  "created": 1703123456,
  "model": "gpt-4o-mini",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "LiteLLM is a unified interface for 100+ LLMs..."
      },
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 150,
    "completion_tokens": 50,
    "total_tokens": 200
  },
  "_hidden_params": {
    "search_results": {...},
    "rerank_results": {...}
  }
}

With Reranking

Add a rerank configuration to improve result quality:

RAG Query with Reranking

curl -X POST "http://localhost:4000/v1/rag/query" \
    -H "Authorization: Bearer sk-1234" \
    -H "Content-Type: application/json" \
    -d '{
        "model": "gpt-4o-mini",
        "messages": [{"role": "user", "content": "What is LiteLLM?"}],
        "retrieval_config": {
            "vector_store_id": "vs_abc123",
            "custom_llm_provider": "openai",
            "top_k": 10
        },
        "rerank": {
            "enabled": true,
            "model": "cohere/rerank-english-v3.0",
            "top_n": 3
        }
    }'

Streaming

Enable streaming for real-time responses:

RAG Query with Streaming

curl -X POST "http://localhost:4000/v1/rag/query" \
    -H "Authorization: Bearer sk-1234" \
    -H "Content-Type: application/json" \
    -d '{
        "model": "gpt-4o-mini",
        "messages": [{"role": "user", "content": "What is LiteLLM?"}],
        "retrieval_config": {
            "vector_store_id": "vs_abc123",
            "custom_llm_provider": "openai"
        },
        "stream": true
    }'

Request Parameters

Top-Level

Parameter	Type	Required	Description
model	string	Yes	The LLM model to use for generation
messages	array	Yes	Array of chat messages (OpenAI format)
retrieval_config	object	Yes	Vector store search configuration
rerank	object	No	Reranking configuration
stream	boolean	No	Enable streaming (default: false)

retrieval_config

Parameter	Type	Default	Description
vector_store_id	string	required	ID of the vector store to search
custom_llm_provider	string	"openai"	Vector store provider
top_k	integer	10	Number of results to retrieve

rerank

Parameter	Type	Default	Description
enabled	boolean	false	Enable reranking
model	string	-	Reranking model (e.g., cohere/rerank-english-v3.0)
top_n	integer	5	Number of results after reranking

End-to-End Example

1. Ingest a Document

First, ingest a document using the /rag/ingest endpoint:

Step 1: Ingest

curl -X POST "http://localhost:4000/v1/rag/ingest" \
    -H "Authorization: Bearer sk-1234" \
    -H "Content-Type: application/json" \
    -d "{
        \"file\": {
            \"filename\": \"company_docs.txt\",
            \"content\": \"$(base64 -i company_docs.txt)\",
            \"content_type\": \"text/plain\"
        },
        \"ingest_options\": {
            \"vector_store\": {
                \"custom_llm_provider\": \"openai\"
            }
        }
    }"

Response:

{
  "id": "ingest_abc123",
  "status": "completed",
  "vector_store_id": "vs_xyz789",
  "file_id": "file-123"
}

2. Query with RAG

Now query the ingested documents:

Step 2: Query

curl -X POST "http://localhost:4000/v1/rag/query" \
    -H "Authorization: Bearer sk-1234" \
    -H "Content-Type: application/json" \
    -d '{
        "model": "gpt-4o-mini",
        "messages": [
            {"role": "user", "content": "What products does the company offer?"}
        ],
        "retrieval_config": {
            "vector_store_id": "vs_xyz789",
            "custom_llm_provider": "openai",
            "top_k": 5
        }
    }'

Response:

{
  "id": "chatcmpl-abc123",
  "object": "chat.completion",
  "model": "gpt-4o-mini",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "Based on the company documents, the company offers..."
      },
      "finish_reason": "stop"
    }
  ]
}

Provider Examples

Bedrock

RAG Query with Bedrock

curl -X POST "http://localhost:4000/v1/rag/query" \
    -H "Authorization: Bearer sk-1234" \
    -H "Content-Type: application/json" \
    -d '{
        "model": "bedrock/anthropic.claude-3-sonnet-20240229-v1:0",
        "messages": [{"role": "user", "content": "What is LiteLLM?"}],
        "retrieval_config": {
            "vector_store_id": "KNOWLEDGE_BASE_ID",
            "custom_llm_provider": "bedrock",
            "top_k": 5
        }
    }'

Vertex AI

RAG Query with Vertex AI

curl -X POST "http://localhost:4000/v1/rag/query" \
    -H "Authorization: Bearer sk-1234" \
    -H "Content-Type: application/json" \
    -d '{
        "model": "vertex_ai/gemini-1.5-pro",
        "messages": [{"role": "user", "content": "What is LiteLLM?"}],
        "retrieval_config": {
            "vector_store_id": "your-corpus-id",
            "custom_llm_provider": "vertex_ai",
            "top_k": 5
        }
    }'

Python SDK

Using litellm.aquery()

import litellm

response = await litellm.aquery(
    model="gpt-4o-mini",
    messages=[{"role": "user", "content": "What is LiteLLM?"}],
    retrieval_config={
        "vector_store_id": "vs_abc123",
        "custom_llm_provider": "openai",
        "top_k": 5,
    },
    rerank={
        "enabled": True,
        "model": "cohere/rerank-english-v3.0",
        "top_n": 3,
    },
)

print(response.choices[0].message.content)