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Tuesday, September 8, 2026

Anthropic releases Claude Fable 5.1 and Mythos 5.1


Anthropic has launched Claude Fable 5.1 and Mythos 5.1, addressing points equivalent to efficiency, information retention, safeguards and value. The updates additionally goal scientific discovery, as the corporate examined the capabilities of the fashions throughout many domains.

Inner testing reveals that Fable 5.1 outperforms Fable 5 when is involves coding, information work and problem-solving duties, the corporate stated. And in low or medium effort assessments, the outcomes are related however at a a lot decrease value. Craig Falls, Head of Quantitative Analysis at Jane Road Capital, stated in an announcement: “In inner benchmarks, Claude Fable 5.1 solves extra of our coding issues than Fable 5 or Opus 5, and achieves state-of-the-art on buying and selling instinct. Whereas prior fashions turned laborious to comply with the longer they labored, Fable 5.1 stays readable over lengthy, multi-step duties.”

In the case of safeguards, the corporate’s Enterprise Frontier Safeguards (EFS) present the form of privateness that’s equal to a zero information retention coverage, and capable of stop malicious use. The safeguards retailer information in cloud infrastructure that a corporation fully controls. This functionality will likely be obtainable starting later this fall, the corporate stated.

The 2 mannequin updates are the identical, however differ when it comes to safeguards. Whereas Fable 5.1 is obtainable for common use, Mythos. 5.1’s safeguards are designed particularly to help cybersecurity and work in life sciences. The up to date safeguards cut back the quantity of alerts the place the system flags content material that’s benign. Anthropic additionally famous that the brand new safeguards block 60% fewer false positives than earlier than.

Claude Fable 5.1 and Claude Mythos 5.1 are the identical mannequin, however with completely different ranges of safeguards. Fable 5.1 is mostly obtainable, whereas Mythos 5.1 is obtainable solely by way of our trusted entry applications; its safeguards are particularly designed to help work in cybersecurity and the life sciences.

In response to the corporate, based mostly on token utilization, Fable 5.1 is predicted to be about 25% inexpensive that Fable 5. That, the corporate stated, has been achieved by reducing the pricing on cache reads — inputs beforehand processed and saved. It additionally stated extremely agentic work will likely be as much as about 45% less expensive.

To study extra in regards to the scientific developments of those up to date fashions, learn Anthropic’s announcement weblog.

David RubinsteinDavid Rubinstein

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