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Anthropic releases Mythos AI model to public

Claude Fable 5

Together with

howdy, it’s Barsee again.

happy wednesday, AI family, and welcome back to AI Valley.

here are the biggest things worth knowing today:

  • Anthropic launches Claude Fable 5

  • Plus trending AI tools, posts, and resources

Let’s dive into the Valley of AI…

TRENDOS

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THROUGH THE VALLEY

Anthropic launches Claude Fable 5, its most powerful public model yet

Anthropic has released Claude Fable 5, the first public version of its Mythos-class AI models. Until now, Mythos was only available through Project Glasswing, a restricted program where more than 150 government agencies, critical infrastructure operators, and cybersecurity teams used the model to identify serious vulnerabilities across major software systems.

Anthropic says Fable 5 delivers major gains in coding, reasoning, scientific research, and long-running agent tasks, with early users already building Pokémon games, Minecraft clones, custom 3D worlds, humanoid robot concepts, and full applications from a single prompt. The company says Fable is built on the same foundation as Mythos 5, but with additional safeguards that route certain cybersecurity, biology, and chemistry requests to Claude Opus 4.8 instead.

Fable is available across all Claude subscription plans until June 22, after which it will move to usage-based pricing. Anthropic is also ending its Zero Data Retention option for Mythos-class models and will require 30-day logging for all usage.

Why it matters

The capabilities once reserved for government agencies, infrastructure operators, and security researchers are now becoming available to the broader public. That line between "frontier model" and "consumer product" is disappearing faster than many expected.

The early examples are also revealing. Users aren't just generating text or debugging code. They're building games, designing products, creating software, and running projects that can take hours to complete. As AI becomes capable of handling larger chunks of work on its own, the bottleneck shifts from execution to deciding what to build and how to turn it into a business.

TRENDING TOOLS

  • Gemini 3.5 Live Translate > Google’s latest audio model for live, speech-to-speech translation across 70+ languages

  • ChatGPT Magic Layer > You can now turn your ChatGPT-generated images into fully editable Canva designs

WHAT I'M CONSUMING

THE VALLEY GEMS

What’s trending on social today:

THAT’S ALL FOR TODAY

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