---
title: "AssemblyAI Summarization chapter count scales with audio length: 2026-09-29 | Harbyn"
description: "AssemblyAI Summarization chapter count scales with audio length, announced Sep 29, 2026."
canonical: "https://harbyn.com/changes/assemblyai/2026-09-29-summarization-chapter-count-scales-with-audio-length"
last-updated: 2026-10-14
---

# AssemblyAI Summarization chapter count scales with audio length

Markdown version of <https://harbyn.com/changes/assemblyai/2026-09-29-summarization-chapter-count-scales-with-audio-length>.

Behavior change - AssemblyAI. info severity. In effect.

Summarization now scales the number of chapters to the audio length, and chapter timestamps no longer overlap.

## Facts

| Fact | Value |
| --- | --- |
| Vendor | [AssemblyAI](https://harbyn.com/vendors/assemblyai.md) |
| Kind | Behavior change |
| Severity | info |
| Status | In effect |
| Announced | Sep 29, 2026 |
| Added to Harbyn | Oct 14, 2026 |
| Lead time | No dated deadline |
| Review | Reviewed by a person, extracted by a model |

## Find it in your code

```sh
npx harbyn scan
```

This change names no identifier the scanner can match line by line, so the scan tells you whether your repository uses AssemblyAI, from its packages and API hosts. Nothing leaves your machine.

## Sources

Where this event comes from: the page we read, when we read it, and the hash of that snapshot.

- <https://www.assemblyai.com/changelog> (changelog, fetched 2026-10-14 17:17 UTC, sha256 `e1e76df0230103047d31e7aaf135387333bf57125bec976087e4e96b9c665ff2`)

## Related changes

### More from AssemblyAI

- [Legacy Summarization and Auto Chapters retire October 20](https://harbyn.com/changes/assemblyai/2026-10-06-legacy-summarization-and-auto-chapters-models-deprecated.md) (Retirement, effective Oct 20, 2026)
- [Clearer error for deleted API keys](https://harbyn.com/changes/assemblyai/2026-10-07-clearer-error-for-deleted-api-keys.md) (Behavior change, announced Oct 7, 2026)
- [French transcript punctuation fix](https://harbyn.com/changes/assemblyai/2026-09-16-french-transcript-punctuation-fix.md) (Behavior change, announced Sep 16, 2026)
- [Improved speaker diarization for non-English audio](https://harbyn.com/changes/assemblyai/2026-09-16-improved-speaker-diarization-for-non-english-audio.md) (Behavior change, announced Sep 16, 2026)

### Changes at other vendors

- [Amazon Selling Partner API: ORDER\_CHANGE notifications add PreFulfillmentStatusChange for Amazon Autos](https://harbyn.com/changes/amazon-sp-api/2026-10-14-sp-api-updates-new-listings-items-api-ivp-values-in-eu5-jp-and-ca-stores-oct-3.md) (effective Oct 28, 2026)
- [BigCommerce: 301 redirects will apply only to storefront channels](https://harbyn.com/changes/bigcommerce/2026-10-07-301-redirects-now-apply-to-storefront-channels-only.md) (effective Nov 10, 2026)
- [GitHub: Secret scanning audit log business field changes to enterprise slug](https://harbyn.com/changes/github/2026-10-20-updates-to-github-secret-scanning-7.md) (effective Nov 12, 2026)
- [Jira / Atlassian Cloud: New IP address ranges in use from January 1, 2027](https://harbyn.com/changes/atlassian-jira/2026-10-16-atlassian-cloud-adds-new-ip-address-ranges.md) (effective Jan 1, 2027)

[All upcoming deadlines](https://harbyn.com/deadlines.md)