#LLM pricing

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A reviewer's laptop on a launch-morning desk showing the Claude model picker with Claude Fable 5.1 in the list, a cursor arrow paused just short of clicking it, a second monitor and a steaming coffee cup soft in the background

Claude Fable 5.1 and Mythos 5.1: What Anthropic Actually Shipped

One weight set, two names — Fable 5.1 goes everywhere the API already reaches, Mythos 5.1 goes only to vetted programs. What actually launched, read off Anthropic's own pages and pricing tables.

By Brecht Corbeel · September 1, 2026 · 11 min read

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