Product Radar Edition 01 · 12 Oct 2026

Anthropic

Claude Fable 5.1

Anthropic's Claude model for demanding reasoning and long-horizon agent work. API id: claude-fable-5-1.

AdoptOn the radar since 12 Oct 2026

platform.claude.com

Position on the radar

Konstantin's verdict: Adopt

Fable 5.1 is my main model. It plans the work with me and hands the building to other agents.

Movement

  1. Added in AdoptMain model in my daily sessions.

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Sources

Also in Models & Agents · Adopt

  • Claude Opus 5.5Anthropic's Claude model for long-running agentic coding and knowledge work. API id: claude-opus-5-5.
  • Claude Sonnet 5.5Anthropic's mid-size Claude model for everyday coding and agent work. API id: claude-sonnet-5-5.