September 2 News.Anthropic Release Claude Fable 5.1 and Claude Mythos 5.1. They use the same bottom model, Fable 5.1, which is open to ordinary users, and Mythos 5.1, which is provided only through a trusted access scheme, the latter ' s protective mechanism specifically dedicated to cybersecurity and life sciences。
According to the company, Fable 5.1 is expected to save approximately 251 TP3T by lowering the Cache Reader price in a typical token-based mission, which is less expensive than Fable 5, with savings of approximately 451 TP3T for a highly intelligent body. The network security protection of the new model, which reduces the wrong interception of normal requests by 60%, now allows users to look for software loopholes, but still prevents them from being exploited。
In the results published by Anthropic, Fable 5.1 scored 55.8% above Table 4 42.0%; CursorBench 3.2.0 scored 73.4%, Fable 5 was 70.5%. Enterprise Frontier Safeguards will keep client data in the cloud infrastructure under their own control and plan to go online in stages starting this fall。