# auto_chapters on POST /v2/transcript stops working

Calls to POST /v2/transcript, body parameter auto_chapters on AssemblyAI API stopped working on October 20, 2026.

AssemblyAI removed support for the body parameter auto_chapters on October 20, 2026. This change affects calls to the POST /v2/transcript endpoint that rely on the legacy Auto Chapters model. Requests including this parameter fail and return errors since that date.

## What to use instead

Use Summarization under Speech Understanding instead, which returns headlined chapters with timestamps.

- API: AssemblyAI API (api.assemblyai.com)
- Kind: Parameter removal
- Announced: October 6, 2026
- Takes effect: October 20, 2026
- Calls after that day: fail
- Calls it hits: `POST /v2/transcript`, `body parameter auto_chapters`
- Source: [Announcement](https://www.assemblyai.com/changelog)
- Verified: November 6, 2026, against AssemblyAI API's own pages
- Page: https://www.okapi.bot/providers/assemblyai-api/breaking-changes/auto-chapters-on-post-v2-transcript-stops-working/

## AssemblyAI API's words

> The legacy Summarization model (the top-level summarization boolean and summary_model parameter) and the legacy Auto Chapters model are deprecated. Starting October 20, 2026, requests using them will return errors.

Okapi finds the calls this change hits in your repo and opens the pull request with the fix: https://github.com/apps/okapi-agent