Home/Events/Anthropic Releases Fable and Mythos 5.1 with Reduced Costs and Enhanced Privacy Features

Anthropic Releases Fable and Mythos 5.1 with Reduced Costs and Enhanced Privacy Features

Confirmed

Confidence

90%

Impact: 80%

Updated 1h ago

Consensus Brief

Anthropic has launched Fable and Mythos 5.1, introducing performance upgrades and reduced token costs. The new models also feature Zero Data Retention, allowing clients to run models on their own infrastructure while maintaining control over monitoring.

Sourced from

TechCrunchT2

Primary: TechCrunch

What Changed Since Last Update

1h ago

The Fable release now includes Zero Data Retention and a high-privacy service called Enterprise Frontier Safeguards, which was previously unavailable.

Claim Ledger

4 claims tracked across sources

Confirmed Fact

Mythos 5.1 is rated as 'low-risk' for concerns related to automated AI development.

Official Claim

Anthropic has never trained on enterprise data without explicit permission.

Confirmed Fact

Mythos 5.1 is slightly more prone to misbehavior compared to Opus 5.

Confirmed Fact

The models set records in benchmarks including Terminal-Bench 4.0 and Humanity’s Last Exam.

Role-Based Impact Analysis

Source Timeline

1 source corroborating

Anthropic’s new Fable release is cheaper, less restrictive

TechCrunch·2h ago