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Available this fall. Join the waitlist.
https://t.co/uamaIarJXY
The US government, citing national security authorities, has issued an export control directive to suspend all access to Fable 5 and Mythos 5 by any foreign national, whether inside or outside the United States, including foreign national Anthropic employees.
The net effect of this order is that we must abruptly disable Fable 5 and Mythos 5 for all our customers to ensure compliance.
Access to all other Claude models is not affected.
We apologize for this disruption to our customers. We believe this is a misunderstanding and are working to restore access as soon as possible.
Read our full statement: https://t.co/bwn0sximKZ
Claude 5 Fable tl;dr
- It is state-of-the-art on nearly all tested benchmarks of AI capability, showing exceptional performance in software engineering, knowledge work, vision, scientific research
-The longer and more complex the task, the larger Fable 5’s lead over our other models
-its more token-efficient than past Claude models
- Fable 5 stays focused across millions of tokens in long-running tasks and improves its outputs using its own notes
Fable 5 is more than just better benchmarks. It's more efficient, allows for longer work periods, offers better context management, and so much more.
GPT-5.6 is just around the corner.
I'm a huge Codex fan, but Fable/Mythos is in a league of its own. I'm curious to see if OpenAI will release its own Mythos.
"During early testing, Stripe reported that Fable 5 compressed months of engineering into days. In a 50-million-line Ruby codebase, the model performed a codebase-wide migration in a day that would otherwise have taken a whole team over two months by hand."
Claude Fable 5 is available everywhere today. Claude Mythos 5 is restricted to Glasswing partners until we expand our trusted access program.
https://t.co/iQymY0jiGq