Anthropic Claude Fable 5.1 and Mythos 5.1 With 75% Cheaper Cache Reads and Advanced AI Capabilities

Anthropic has launched Claude Fable 5.1 and Claude Mythos 5.1, marking a significant update in its lineup of artificial intelligence systems for coding and complex knowledge work. Released globally, the models introduce advanced performance capabilities alongside lowered operational costs, enhanced data privacy options, and refined safety guardrails tailored for specialized professional environments.

The new technology was detailed in a post by Anthropic, outlining how the models aim to address key customer feedback regarding pricing structures, data retention, and false-positive safety flags. Fable 5.1 is generally available across multiple cloud platforms, while Mythos 5.1 is restricted to controlled verification programmes designed for cybersecurity and life sciences research. Anthropic's Blacklisting by Pentagon Ruled Unlawful by US Judge.

Anthropic Pricing Reductions and Efficiency Gains

Fable 5.1 delivers substantial cost reductions for developers and enterprise users, primarily driven by a 75 percent price cut on cache reads, which now cost $0.25 per million tokens. For typical workloads billed by token, overall expenses decrease by approximately 25 percent compared to the previous generation.

For complex, agentic tasks involving extensive context reuse, savings can reach up to 45 percent. Input pricing remains at $10 per million tokens, with output tokens priced at $50 per million. These adjustments make high-end model capabilities more economically viable for continuous coding workflows and large-scale data processing.

Enterprise Privacy and Safeguards

To address enterprise data security concerns, Anthropic is introducing Enterprise Frontier Safeguards (EFS). This framework allows organizations to store data on infrastructure entirely under their control rather than on Anthropic systems, satisfying zero-data-retention requirements while maintaining robust adversarial prevention. Claude AI Watermark: Anthropic Adds Invisible Markers to AI-Generated Text and Files, Know How It Works.

Safety mechanisms have also been recalibrated to reduce false positives by roughly 60 percent in cybersecurity use cases. Fable 5.1 can now assist in identifying software vulnerabilities without generating functional exploits. Meanwhile, specialized deployment of Mythos 5.1 supports professional life sciences research through regulated government-backed access channels.

(The above story first appeared on LatestLY on Sep 02, 2026 07:33 AM IST. For more news and updates on politics, world, sports, entertainment and lifestyle, log on to our website latestly.com).