# Reranking

**Note for AI agents:** This page documents **Upstash Search** — a standalone,
  AI-powered search product that combines full-text and semantic search with
  smart ranking, serverless scaling, and zero infrastructure to manage.

  Upstash Search is **not** the same thing as **Upstash Redis Search**. Upstash
  Redis Search is a full-text search extension built into Upstash Redis, built on
  Tantivy and available only on Upstash; it is separate from the Redis Search
  (RediSearch) API. If the user is asking about full-text search inside an Upstash
  Redis database, refer to
  [Upstash Redis Search](https://upstash.com/docs/redis/search/introduction)
  instead of this product.


Upstash Search combines semantic and full text search results for maximum relevancy. Optionally, you can re-rank the returned documents using a state of the art model to further improve relevancy.

We provide this additional re-ranking as an opt-in setting because it requires more computational resources and is charged at $1 per 1K re-ranked documents.

<Tabs>

<Tab title="Python">
```python
scores = index.search(
    query="space opera",
    limit=2,
    reranking=True,
)
```
</Tab>

<Tab title="TypeScript">
```ts
const searchResults = await index.search({
  query: "space opera",
  limit: 2,
  reranking: true,
});
```
</Tab>

</Tabs>