> ## Documentation Index
> Fetch the complete documentation index at: https://exa.ai/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# API Deprecation Notice

**Date: April 1, 2026**

<Warning>
  Status as of May 1, 2026: these removals are complete. The fields, parameters, and endpoints below no longer exist.
</Warning>

We're retiring a few legacy fields, parameters, and one endpoint from the Exa API. If your integration uses any of the items below, please update before May 1, 2026.

 

## What's Changing

**/research endpoint**
<br />Sunsetting on May 1. Migrate to /search with type: "deep-reasoning". [See here for an example.](https://dashboard.exa.ai/playground/search?q=Latest%20news%20on%20Nvidia\&filters=%7B%22highlights%22%3Atrue%2C%22outputSchema%22%3A%7B%22description%22%3A%22Answer%20in%20detail%20with%20multiple%20sections%20and%20specific%20details%22%2C%22type%22%3A%22text%22%7D%2C%22type%22%3A%22deep-reasoning%22%7D)

**resolvedSearchType (response field)**
<br />Will return null on April 15, removed on May 1. If you parse this field, stop reading it before the sunset date.

**highlightScores (response field)**
<br />Will return null on April 15, removed on May 1. Highlights themselves are unaffected.

**startCrawlDate / endCrawlDate (request parameters)**
<br />On April 15, these will be silently ignored (requests will succeed, but the filter will have no effect).

 

## Timeline

1. **April 1** — This notice
2. **April 15** — Deprecated features return null / are ignored
3. **May 1** — Hard removal. Removed features will stop working.

 

## Questions?

Reach out at [support@exa.ai](mailto:support@exa.ai).