# Anthropic's Claude Fable 5.1 and Mythos 5.1 arrive with a 75% cost reduction for Fable cache reads

> **Newsylist Open Intelligence Dossier** · First detected: 2026-09-02 02:29 UTC · Category: Business · Sources: 3 · Current Velocity: 1.3

## Multi-Source Evidence Table
| Source Outlet | Headline | Published (UTC) | Verification URL |
|---|---|---|---|
| South China Morning Post | Frontier AI at a cost: what Anthropic’s Fable 5.1 means for the US-China model race | 2026-09-01 18:41 | [Source Link](https://news.google.com/rss/articles/CBMiugFBVV95cUxPeGc3TXdfdXdxMTB1N2ZzWE42TzZKNFMyeUttSktKXzI0SWQzUHNWQWwzRmxnejlOUHZGdEpfcHR1MzhHNTJ2YXJCd3NxQ2RLbFJKcXZJQ0RER3RTTkxpWFRzcWpGOHpDQ1BUYVhWUFp1MlhfVERKTklUSFFHOXdueTNCVGFTaFhfTXdQOXNfZWhZZW1lZjN2aUljdVAyQzhxR0xmTWF6UC1IYmdlcjJzREVmcmdDZV9MZ0E?oc=5) |
| The Register | Anthropic promises zero data retention | 2026-09-01 18:41 | [Source Link](https://news.google.com/rss/articles/CBMiygFBVV95cUxQNDd5bUsxOGc2Wlp5dWNKX1FpTVhsWURtZTJJWWh5WjBoOF9BbF9TUi1MVm4xM2luZVNPdTA1bWlVb0YzUHVrV1k3emhhQzMxWWhlbEF6VjdIbEk1alN6Qk1yaGZWVzFFcTFtREwycG9vb21tUXpxNUtTaUZyVVNJUTlpSU44MW9nMzY2NlZNVzRDeTladTlrRHNrV2x4LWd3YTdJZ0FQaWViRnAxQVRMRTRzT3YzdFF2ZXlHMVVPOXZoM1VfTmRjb1pB?oc=5) |
| finance.yahoo.com | Anthropic Says New Fable AI Model Is Cheaper, Better at Coding | 2026-09-01 18:41 | [Source Link](https://news.google.com/rss/articles/CBMimAFBVV95cUxNVXB2cnN3RFNsLURPY2MyXzItenhKWm5OMENhckVtM3V1eFhUNjRXNGtsbDVleW1USUU2WVRTTnVZd1RDWmszMVNoOVZwQTlGRE9fbGJ1c3N6Z0VJSUhJWlJ5ZHlWcnhHNjNXaFRqcWF3eTRWWWh2NG5LMXlIeTBmVmU4NnFOY05CaXg4eHMwYnIzVHM1UkxoUQ?oc=5) |

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*Canonical Source: https://www.newsylist.com/trend/2026-09-02/anthropic-s-claude-fable-5-1-and-mythos-5-1-arrive-with-a-75-cost-reduction-for*
*Synthesized by Newsylist Open Intelligence Engine under E-E-A-T journalistic standards.*