# GET /get-chat-agent-versions/{} stops working

Calls to GET /get-chat-agent-versions/{} on Retell AI API stopped working on September 15, 2026.

- API: Retell AI API (api.retellai.com)
- Kind: Endpoint removal
- Takes effect: September 15, 2026
- Calls after that day: fail
- Calls it hits: `GET /get-chat-agent-versions/{}`
- Source: [Announcement](https://docs.retellai.com/deprecation-notice/2026/09-15_get_agent_versions)
- Page: https://www.okapi.bot/providers/retell-ai-api/breaking-changes/get-get-chat-agent-versions-stops-working/

## What to use instead

Call GET /list-agent-versions/{agent_id} instead.

## Retell AI API's words

> The following APIs are deprecated as of 09/15/2026. Migrate to the listed replacements.