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Announcements Chatter Podcasts Policy The week Models Connect your AI

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||Anthropic All models

Announcements Chatter Podcasts Policy The week Models Connect your AI

Claude Mythos 5.1

Name: Claude Mythos 5.1
Brand: Anthropic

Announcements Chatter Podcasts Policy The week Models Connect your AI

Anthropic modelsHaiku 5.5 Sonnet 5.5 Opus 5.5 Mythos 5.1 Fable 5.1 Opus 5 Sonnet 5 Fable 5

So far

1 Sep
announced2026
2
posts about itFirst-party
6
outlets reportedOn its posts

So far

1 Sep
announced2026
2
posts about itFirst-party
6
outlets reportedOn its posts

Anthropic·All models

Anthropic models

Claude Haiku 5.57 Oct
Claude Sonnet 5.528 Sep

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Claude Mythos 5.1 · Anthropic — forck

||Anthropic All models

Announcements Chatter Podcasts Policy The week Models Connect your AI

Claude Mythos 5.1

Announcements Chatter Podcasts Policy The week Models Connect your AI

Anthropic modelsHaiku 5.5 Sonnet 5.5 Opus 5.5 Mythos 5.1 Fable 5.1 Opus 5 Sonnet 5 Fable 5

So far

1 Sep
announced2026
2
posts about itFirst-party
6
outlets reportedOn its posts

So far

1 Sep
announced2026
2
posts about itFirst-party
6
outlets reportedOn its posts

Anthropic·All models

Anthropic models

Claude Haiku 5.57 Oct
Claude Sonnet 5.528 Sep

Claude Opus 5.5

22 Sep

Claude Fable 5.11 Sep

+12 →

Launch

Anthropic· 1 Sep

Introducing Claude Mythos and Fable 5.1

Claude Fable 5.1 costs 25% less than Fable 5 for typical workloads.

Most coveredNew model

TestingCatalog: “Anthropic launches Claude Fable 5.1 and Mythos 5.1”

Reporting · 6 outlets

Image from anthropic.com

Anthropic· 1 Sept

Introducing Claude Mythos and Fable 5.1

Everything else, by date

How Comcast and Booz Allen use Claude Mythos to find exploit chains and secure their codebases6 Oct

About the model

Lab: Anthropic
Price: cost an estimated 25% less than Fable 5 for typical workloads

Ask your AI

Your brief, straight from the record

Connect once, then ask Claude or ChatGPT what changed for the tools you use. Every item links to its page on forck.live.

+ any MCP app

Connect your AI →

About the model

Lab: Anthropic
Price: cost an estimated 25% less than Fable 5 for typical workloads

Ask your AI

Your brief, straight from the record

Connect once, then ask Claude or ChatGPT what changed for the tools you use. Every item links to its page on forck.live.

+ any MCP app

Connect your AI →