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Anthropic confirms Claude Mythos-class models will roll out to the public

BACKGROUND
1 SIGNALFIRST DETECTED 29 May 2026
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How the story developed
Other feeds and industry voices
25 May
Anthropic’s restricted Claude Mythos model may be coming to Claude Code

Anthropic appears to be preparing for the public rollout of the Mythos model, which was announced in April as a restricted model that poses major security risks to private and

REPORT · WHAT · BleepingComputerOPEN STORY
24 Jul
Anthropic releases Opus 5 with ‘close’ to Fable 5’s capabilities

Weeks after Anthropic's latest toe-to-toe with the US government, and days after an OpenAI security incident that dominated tech industry discussions, Anthropic on Thursday

REPORT · WHO · The Verge TechOPEN STORY
16 Apr
Anthropic releases a new Opus model amid Mythos Preview buzz

Anthropic releases a new Opus model amid Mythos Preview buzz

OPINION · WHAT · The VergeOPEN STORY
28 Sept
Anthropic rolls out second Claude 5.5 model as it builds toward IPO reut.rs/4hqED7K

Anthropic rolls out second Claude 5.5 model as it builds toward IPO reut.rs/4hqED7K

OPINION · WHAT · ReutersOPEN STORY
1 Jul
Anthropic’s long-sidelined Fable 5 is greenlit to return

After weeks of negotiating with the Trump administration, Anthropic is finally going to be able to bring Claude Fable 5 back online. In a post on X, Anthropic said it plans to

REPORT · WHO · The Verge TechOPEN STORY
20 Apr
NSA is said to be using Anthropic's restricted Mythos AI model.

NSA is said to be using Anthropic's restricted Mythos AI model.

OPINION · WHO · TechCrunchOPEN STORY
8 Apr
Anthropic limits access to Mythos, its new cybersecurity AI model

A select group of customers is testing the Claude Mythos Preview.

REPORT · WHAT · Ars TechnicaOPEN STORY
10 Jun
Microsoft restricts Claude Fable for employees over data retention concerns

Anthropic released Claude Fable, its first Mythos-class AI model, yesterday and it's already causing concerns inside Microsoft. Sources tell me that Microsoft is limiting the use

REPORT · WHEN · The Verge TechOPEN STORY
Sources
BleepingComputer

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