--- title: "ElevenLabs API Multi-context turn boundary marker: 2026-09-21 | Harbyn" description: "ElevenLabs API Multi-context turn boundary marker, announced Sep 21, 2026." canonical: "https://harbyn.com/changes/elevenlabs/2026-09-21-text-to-speech" last-updated: 2026-10-02 --- # ElevenLabs API Multi-context turn boundary marker Markdown version of . Behavior change - ElevenLabs API. low severity. In effect. The is\_final\_audio\_for\_turn marker is now emitted after every buffered byte for a turn, including MP3 and Opus output. ## Facts | Fact | Value | | --- | --- | | Vendor | [ElevenLabs API](https://harbyn.com/vendors/elevenlabs.md) | | Kind | Behavior change | | Severity | low | | Status | In effect | | Announced | Sep 21, 2026 | | Added to Harbyn | Oct 2, 2026 | | Lead time | No dated deadline | | Symbols | `is_final_audio_for_turn` | | 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 ElevenLabs API, 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. - (changelog, fetched 2026-10-02 22:20 UTC, sha256 `43059b8c565217296a65aec4778d9144268c3e8a8f519bf3cab220b206846b58`) ## Related changes ### More from ElevenLabs API - [Conversation filters no longer accept the missing operator](https://harbyn.com/changes/elevenlabs/2026-09-21-api-12.md) (Breaking change, announced Sep 21, 2026) - [Crawl job max\_depth deprecated and now ignored](https://harbyn.com/changes/elevenlabs/2026-09-21-api-7.md) (Deprecation, announced Sep 21, 2026) - [JavaScript and Python SDK v2.69.0 fix Speech Engine JWT verification](https://harbyn.com/changes/elevenlabs/2026-09-21-sdk-releases-2.md) (Behavior change, announced Sep 21, 2026) - [Python SDK v2.69.0 play raises an error when ffplay fails](https://harbyn.com/changes/elevenlabs/2026-09-21-sdk-releases-5.md) (Behavior change, announced Sep 21, 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)