The model Anthropic said was too dangerous to release is now in your hands.
Claude Fable 5 is live — a public version of Mythos, the model they locked behind closed doors because of how capable it is. It’s a full tier above Opus 4.8. State-of-the-art on nearly every benchmark. And the longer and more complex the task, the bigger its lead gets.
I recorded this the hour it dropped — what it actually is, how to turn it on in your Claude app right now (including the /model trick if it’s not showing up), and what it means if you run your business on Claude like I do.
In this one:
Fable 5 vs. Mythos 5 — two models, one brain, and which one you actually get
The numbers: the jump over Opus 4.8
Pricing — $10/$50, double Opus — and the June 22 deadline you need to know about
The guardrails, straight: what falls back to Opus 4.8 and why you’ll probably never hit it
The part that matters most: everyone got the most powerful model ever today — what separates you is the system you point it at
If you’ve been building your system — your context, your skills, your voice, your wiki — today is the day all of that quietly became worth more. And if you haven’t started building one yet: this is your sign.
Own the part that’s yours. The engine just got a lot stronger.
—Alex
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