Fable’s back.
AI #172: The First Fable
A lot happened this week, including a great trip out to Lighthaven.
The Once And Future Fable #3: Fix This Code
The mainstream media continues to sleep on the most important story in the world.
Introducing Claude Fable 5.1 and Claude Mythos 5.1
Our most advanced models for coding and knowledge work. Their research capabilities also offer an early glimpse of how AI models will contribute to scientific progress.
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.
The Once And Future Fable #2
On Friday evening the United States Government has forced Anthropic to take down all access to Fable and Mythos.
Anthropic’s Mythos 5 is back
Anthropic’s Mythos 5 model, the subject of weekslong negotiations with the Trump administration, is back in action. No word yet on Fable 5.
Moving Forward from Hot Fable Summer
Suggestions on how to move forward on the craziest 90 days in cyber and AI history.
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.
Anthropic’s long-sidelined Fable 5 is greenlit to return
After Mythos 5’s conditional return, Anthropic’s Fable 5 is back too.
Import AI 464: Fables writes GPU kernels; AI automation; and analog computation
Is this the beginning of a new world?
Claude Fable 5 and Mythos 5: The System Card
First things first: Claude Fable 5 is the new best publicly available model.
Redeploying Claude Fable 5
Anthropic is redeploying Claude Fable 5 starting July 1 following the lifting of export controls, with updated cybersecurity safeguards and a new industry jailbreak framework.
Claude Fable 5 and new safety fables
One step further into the power politics of frontier AI systems.
A field guide to Claude Fable 5: Finding your unknowns | Claude | Claude by Anthropic
Practical patterns for agentic coding with Claude Fable: how to find your unknowns before, during, and after implementation, from the team at Anthropic.
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.
