Claude Fable model releases

A source-backed timeline for the Claude Fable model family, collecting release dates, labs, access details, context windows, and major lifecycle changes.

Models

Labs

Open

Recent

All models·Latest releases·Coding models·Reasoning models·Changelog

Most recent in this set

Jun 9, 2026

Claude Fable 5

Anthropic

Sort

1 model

Claude Fable 5

Withdrawn

AnthropicFrontierProprietary

The public, guardrailed sibling of Mythos and Anthropic's most capable widely-released model, built for long-horizon agentic work. Launched June 9, 2026 across the Claude API, AWS, and Microsoft Foundry — then pulled three days later under a US government export-control directive barring access by foreign nationals.

—Undisc.— ctxJun 9, 2026