# Anthropic releases Fable 5.1 with lower cache-read pricing

_Published Tuesday, September 1, 2026 at 3:18 PM EDT · AI · Latest · Tier 1 — Major_

![Anthropic logo — Primary](https://cdn.sanity.io/images/4zrzovbb/website/932ca7d6f414ca22fd5a26dcc131410575b9b3e5-1200x630.jpg)

Anthropic introduced Claude Fable 5.1, which it says is generally available, alongside the more restricted Claude Mythos 5.1. Anthropic says Fable 5.1 will cost an estimated 25% less than Fable 5 for typical token-billed workloads because of lower cache-read pricing; it estimates savings of up to about 45% for highly agentic work. The company says enterprise safeguards will roll out in phases beginning later this fall, while eligible customers can use zero data retention in the interim.

## Sources

- [anthropic.com](https://www.anthropic.com/claude-fable-and-mythos-5-1)
- [TechCabal](https://techcabal.com/2026/09/03/claude-mythos-5-1-price-and-availability-explained/)

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Canonical: https://techandbusiness.org/newswire/VPjXFDwqS76lcFBlo9DLPt
Published: 2026-09-01T19:18:16.819Z
Story chronology: 2026-09-01T17:53:53.000Z
Retrieved: 2026-10-17T03:10:49.015Z
Publisher: Tech & Business (techandbusiness.org)