Anthropic prices Fable 5.1 at $10/1M input tokens and $50/1M output tokens, unchanged from Fable 5, and cuts cache read pricing by 75% to $0.25/1M tokens (Frederic Lardinois/The New Stack)

Anthropic has released its latest AI models, Fable 5.1 and Mythos 5.1, which the company claims are its most capable large language models to date. Fable 5.1 is broadly available, while Mythos 5.1 is restricted to vetted partners working in cybersecurity and life sciences. According to The New Stack, the pricing for Fable 5.1 remains unchanged from Fable 5, at $10 per 1 million input tokens and $50 per 1 million output tokens.

The company has reduced its cache read pricing by 75% to $0.25 per 1 million tokens. This change is expected to result in cost savings for customers, with typical workloads costing around 25% less than with Fable 5, and up to 45% less for complex tasks, according to Mashable. The Verge reports that Fable 5.1 offers stronger performance than Fable 5.

Anthropic says Fable 5.1 has set records across several AI benchmarks, including Terminal-Bench-Science 0.1 and Terminal-Bench 4.0, as reported by SiliconANGLE. The model also has more relaxed guardrails, allowing researchers to use it to discover software vulnerabilities. Additionally, Anthropic claims that its updated biology safeguards now fire far less often on benign medical questions, and that cybersecurity safeguards produce about 60% fewer false interventions in Claude Code sessions than before, according to Mashable.

Brief written by urgent.news from Techmeme, The Verge, SiliconANGLE, Mashable, TechCrunch — 5 reports on this story. Machine-written — may contain errors; check the original before relying on it.