Updates
1. v2.1.257
What's changed Added Claude Fable 5.1 ( claude-fable-5-1 ), now the default Fable model - 1M context.
Proof: The source records 1M / v2.1.257.
Impact: Teams evaluating Anthropic v2.1.257 can compare its documented input scope, limits, and deployment fit.
Watch next: For Anthropic, watch access tiers, latency, pricing, benchmark updates, and where the model becomes available.
Canonical host: github.com