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Map / Core AI / Foundation Models / Claude / Fable

Claude Fable

by Anthropic · part of Claude · Text

Anthropic's top Mythos-class line, above Opus, for demanding reasoning and long-horizon agentic work, released with extra safeguards.

Latest version

Fable 5.11 Sep 2026 · 57 days ago

Versions

2since Claude Fable 5 in June 2026

All versions

VersionReleasedAfter previousStatusComes asSource
Claude Fable 5.11 Sep 202684 daysLatestClaude Mythos 5.1anthropic.com
Claude Fable 59 Jun 2026FirstClaude Mythos 5anthropic.com

Dates from Anthropic's own announcements; each row links to its source.

The Claude family

2023202420252026TodayOpusClaude 3 Opus (Claude Opus 3), 4 Mar 20243Claude Opus 4, 22 May 20254Claude Opus 4.1, 5 Aug 20254.1Claude Opus 4.5, 24 Nov 20254.5Claude Opus 4.6, 5 Feb 20264.6Claude Opus 4.7, 16 Apr 20264.7Claude Opus 4.8, 28 May 2026Claude Opus 5, 24 Jul 20265Claude Opus 5.5, 22 Sep 20265.5SonnetClaude 3 Sonnet (Claude Sonnet 3), 4 Mar 20243Claude 3.5 Sonnet (Claude Sonnet 3.5), 20 Jun 20243.5Claude 3.7 Sonnet (Claude Sonnet 3.7), 24 Feb 20253.7Claude Sonnet 4, 22 May 20254Claude Sonnet 4.5, 29 Sep 20254.5Claude Sonnet 4.6, 17 Feb 20264.6Claude Sonnet 5, 30 Jun 20265Claude Sonnet 5.5, 28 Sep 20265.5HaikuClaude 3 Haiku (Claude Haiku 3), 13 Mar 20243Claude 3.5 Haiku (Claude Haiku 3.5), 4 Nov 20243.5Claude Haiku 4.5, 15 Oct 20254.5Claude Haiku 5.5, 7 Oct 20265.5FableClaude Fable 5, 9 Jun 20265Claude Fable 5.1, 1 Sep 20265.1LegacyClaude 1, 14 Mar 20231Claude 2, 11 Jul 20232Claude 2.1, 21 Nov 20232.1

VersionPreviewLatest version

Questions

What is the latest version of Claude Fable?

Claude Fable 5.1, released on 1 Sep 2026.

When was Claude Fable 5 released?

Claude Fable 5 came out on 9 Jun 2026.