A lot happened this week, including a great trip out to Lighthaven.
Moving Forward from Hot Fable Summer
Suggestions on how to move forward on the craziest 90 days in cyber and AI history.
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.
Qwen on Twitter / X
Qwen3.8 is launching and going open-weight soon!🌐With a massive 2.4T parameters, this model is continuously evolving. We believe it’s one of the most powerful model available today, compatible to leading frontier AI models , second only to Fable 5.You don't have to wait to… pic.twitter.com/JS3ID73IYS— Qwen (@Alibaba_Qwen) July 19, 2026
The Once And Future Fable #3: Fix This Code
The mainstream media continues to sleep on the most important story in the world.
Monthly Roundup #45: August 2026
As AI has escalated increasingly quickly, more and more of my posts have ended up focusing on AI.
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.
AI #176 Part 1: Doing It Live
Enough things added up that this week is getting split into two parts.
AI #158: The Department of War
This was the worst week I have had in quite a while, maybe ever.
AI #182: Pause For Reflection
This was a week of quiet aftermath, an opportunity to process recent events and start to figure out the path forward.
Claude Fable 5 and Mythos 5: The System Card
First things first: Claude Fable 5 is the new best publicly available model.
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’s long-sidelined Fable 5 is greenlit to return
After Mythos 5’s conditional return, Anthropic’s Fable 5 is back too.
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.
