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Cursor Docs

Cursor · Docs

Cursor Docs

September 1, 2026 at 6:20 PM UTC

New page: Claude Fable 5.1 — Anthropic’s latest Mythos-class model for long-running agentic work; replaces Fable 5 with matching input/output rates and 75% cheaper prompt-cache reads. Privacy Mode and Enterprise customers need admin appr…

Changelog

Models

  • New page: Claude Fable 5.1 — Anthropic’s latest Mythos-class model for long-running agentic work; replaces Fable 5 with matching input/output rates and 75% cheaper prompt-cache reads. Privacy Mode and Enterprise customers need admin approval of Anthropic’s data retention policy before use.
  • Claude Fable 5 now recommends Fable 5.1 (cheaper prompt-cache reads); Fable 5 remains available.
  • Claude Opus 5 ZDR notes updated to call out that both Fable 5 and Fable 5.1 require Anthropic data-retention opt-in.

Enterprise

  • Privacy and data governance now lists Claude Fable 5.1 alongside Fable 5 under models that need provider data retention and admin approval.

API

  • Origin API docs now include scope and auth details on endpoints such as Get Rate Limit and Get Authenticated App, with clearer example rate-limit response values.
Older release← Sep 1, 16:20 UTCNewer release→ Sep 2, 00:20 UTC
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