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The US Government Just Banned Anthropic’s New AI Model

2026-06-14 · 03:23 UTC ·Matt Maher ·1 min read

Brief

Matt Maher’s June 14, 2026 hands-on review and benchmark breakdown evaluates Anthropic’s Fable 5 (a classifier-fronted offshoot of Mythos 5) and demonstrates stronger coding scores, better long-task handling, and a more reliable pre-planning style in demos and the CARE benchmark. He also documents a June 12 US directive that abruptly cut access for foreign nationals and some employees, potentially altering future frontier-model deployment.

Why it matters

Matt Maher tested Anthropic’s Fable 5 (a “safer” offshoot of Mythos 5 with a classifier in front of the capability surface) and found stronger benchmark scores, improved long-task behavior, and a clearer “pre-plan” steering style versus Mythos 5.

Key details

  • A US government directive on June 12, 2026 forced Anthropic to disable access to Fable 5, blocking foreign nationals and even some employees from using the model.
  • Maher used the CARE benchmark and hands-on demos (coding and game-style tasks) to quantify Fable 5’s gains and showcased concrete improvements in coding benchmarks and multi-step task performance.
Source evidence

Anthropic's Fable 5 was not just another model bump. It was a real jump in long-running tasks, coding benchmarks, and the kind of intent-carrying behavior I care about most. Then the US government stepped in and access was abruptly cut off. So this is part hands-on review, part benchmark breakdown, and part "what exactly did we just watch happen?"

Fable 5 was released as a safer offshoot of Mythos 5, with a classifier in front of the more dangerous capability surface. I tested it before access disappeared, and the results were not subtle: stronger benchmark numbers, better long-task behavior, and a much better "pre-plan" style that made complex requests easier to steer. But the bigger story is the June 12 US government directive that forced Anthropic to disable access, including for foreign nationals and even some employees. If this standard becomes normal, it could change how every frontier model gets deployed.

https://www.anthropic.com/news/fable-mythos-access
https://www.anthropic.com/news/claude-fable-5-mythos-5
https://carebenchmark.metal-sole.com/
https://wordle.metal-sole.com/

00:00 - Intro
00:53 - Release Notes
04:04 - BANNED
05:14 - Post from Anthropic
06:42 - Wrong Way!
09:55 - Fable 5
12:40 - CARE Benchmark
16:08 - Fable 5 Favorite Moves
19:55 - THE GAME
22:53 - Conclusion

Channel: Matt Maher
Published: 2026-06-14
Video URL: https://www.youtube.com/watch?v=N459K9wmxcc