AssemblyAI API
auto_chapters body parameter removal on POST /v2/transcript
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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.
Calls it hits
POST /v2/transcriptbody parameter auto_chapters
What to use instead of these calls
Use Summarization under Speech Understanding instead, which returns headlined chapters with timestamps.
In 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.
Facts
- API
- AssemblyAI API
api.assemblyai.com - Kind
- Parameter removal
- Announced
- October 6, 2026
- Takes effect
- October 20, 2026
- Calls after that day
- Fail
- Source
- Announcement
- Last updated
- Verified
- , against AssemblyAI API's own pages
Questions
When does this change take effect?
Calls to POST /v2/transcript, body parameter auto_chapters on AssemblyAI API stopped working on October 20, 2026.
What happens to calls after October 20, 2026?
They have failed since October 20, 2026.
How do I find the calls this hits in my code?
Okapi reads your repository, finds the calls this change hits and opens a pull request with the fix. It never commits to your branches: every change comes as a pull request you review.
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POST /v2/transcriptParameter removal Stopped working -
POST /v2/transcriptParameter removal Stopped working -
No date
POST /v2/transcriptParameter removal Deprecated, no date
You fixed this one by hand.
Okapi opens the pull request with the fix before the next breaking change reaches your code.