life lesson: never bet on a custom harness like Pi
been loving my custom Pi setup for the last few weeks, the fact that I can build any extension, use any models
but things are moving too fast today
huge teams behind Claude / Codex change the way we develop almost every month
so by building and maintaining a custom agent you're more likely to get left behind
most models perform better in their native harnesses anyway, and using external ones is likely to get banned
so I recommend betting your workflow on a portable primitives, like prompts, skills or scripts, instead of custom agents
i assume it’s an evolutionary perception.
you’re defenses are down when your laughing.
eyes closed. throat exposed.
but eyes wide. chin tucked.
this says “i poisoned you and i don’t want to miss a second of your suffocating”
and fuck me.
maybe this is on purpose for the memes or because it’s how Mr Beast got halfabillion subscribers.
i just know it make my meat-brain feel like something off
LLMs are really good with three.js.
And seeing full-fledged 3D one-shots makes it really hard to understand why it still sucks at basic multi-step tasks.
Claude 5 Fable (Ultracode)
I asked it to build a demo of my dream game in Three.js and I'm genuinely shocked 💀
One shot, a full explorable starship with a working cockpit, crew quarters, a planet drifting past real windows, dynamic lighting, sleep/eat interactions,
it screenshotted its own work and fixed itself until it hit 60fps on browser
Obviously not steam ready but man this is so so far from what we had one year ago…
After a workweek with Fable 5:
on vibes, i don't like it.
but has unique abilities.
it's slow. and not notably better than gpt-5.5 for basic brownfield web work.
tho it's more decisive in identifying bugs and discerning their fixes.
it seems like a good ongoing observer of application quality. strong architect vibes.
and thus…
SO boring.
first model i really don't want to talk with.
Introducing Claude Fable 5: a Mythos-class model that we’ve made safe for general use.
Its capabilities exceed those of any model we’ve ever made generally available.