







LLMs can make complete multi-level games that are fun.

Claude Fable 5 and Mythos 5: The System Card
First things first: Claude Fable 5 is the new best publicly available model.

Fable and Mythos 5.2: The System Card
It’s that time again: Introducing the world’s most powerful model, Claude Mythos 5.2.

Claude Fable 5 and Claude Mythos 5
Today we’re launching Claude Fable 5: a Mythos-class model that we’ve made safe for general use.

Claude Fable 5.1 and Mythos 5.1: The System Card
At the time of its release Claude Fable 5.1 was, by a healthy margin, the most capable publicly available AI model in the world.


GameSpot's SIMply Divine: The Story of Maxis Software
GameSpot action adventure driving puzzle role-playing simulation sports strategy hardware
How does Fable 5.1 hide messages in images? — LessWrong
TL;DR Frontier LLMs are now capable of generating artistic images using SVG. We ask – if these LLMs had to hide a message in an image – how would the…
Claude Mythos 5.1 and Fable 5.1: Capabilities
This is the weirdest situation in which to write a capabilities review.

Claude Fable is relentlessly proactive
After two days of experience with Claude Fable 5 I think the best way to describe it is relentlessly proactive. It knows a whole lot of tricks and it will …


Funny Games
All the games in the Funny Games collection are the kind of games you play for fun, just for fun.

Experimental Games Showcase
The Experimental Game Workshop Showcase, which featured games like 'Baba Is You', 'The Longing', 'Braid', 'Untitled Goose Game' and 'Katamari Damacy', is back for its 24th year at GDC! In this fast-paced, game-packed session, panelists will...
Integrating Narrative into Game Design: A Portal Post-Mortem
Anthropic releases Claude Fable, a version of Mythos, days after warning AI is becoming too dangerous
Anthropic is releasing Claude Fable 5, its first Mythos-class model available to the public. The model comes with guardrails that block responses in high-risk areas like cybersecurity and biology.

Our team just shipped Fugu-Ultra v1.1! 🐡 By dynamically orchestrating the latest frontier models, we pushed performance up by 7.9 points. We are now beating Fable 5 in complex coding and reasoning tasks without even having Fable 5 in our agent pool. Collective intelligence is the future.
Sakana AI
Announcing Fugu-Ultra v1.1 🐡 We’ve been thrilled by the reception to the Fugu model family. Thanks to everyone who tried it, shared feedback, and trusted Fugu with real work. Today, we’re releasing Fugu-Ultra v1.1 → sakana.ai/fugu Upgraded to incorporate the latest frontier models.