Anthropic releases Fable 5.1 with a separate trusted-access configuration
Anthropic says Fable 5.1 is generally available and Mythos 5.1 uses the same underlying model with different safeguards through trusted-access programs. Reduced cache-read pricing is estimated by Anthropic to lower typical token-billed workload costs by 25%. Enterprise Frontier Safeguards are planned for phased availability later in the fall.
The release couples capability claims with inference economics and enterprise data handling. Cache-heavy agent workflows could change model selection and workload economics.
Anthropic source ↗ Anthropic source ↗
Confidence: high · Detected 2026-09-15
Evidence, exposure & uncertainty →