A thread of early experiments with Claude Sonnet 5.5. A fall foliage simulator by Pete, made with Sonnet 5 vs Sonnet 5.5.

gave Sonnet 5.5 a 60×46 pixel emoji and asked for a 3D model he could print. A few hours later, it was on his desk.

The history of the dinosaurs in under a minute by @kevin_t_ngo, animated in JavaScript from the same prompt, Sonnet 5 vs Sonnet 5.5.

Light through a forest canopy, rendered in real time by @measure_plan. Visuals and sound are written in code.

A working flowchart tool that looks like doodles on graph paper, by @kevin_t_ngo. Drag shapes, connect them, or sketch on top.

Pixel-art forest creatures by @measure_plan, every frame drawn in code.

Bouncing-ball physics tests by @forwardeditor from the same prompt, Sonnet 5 vs Sonnet 5.5.

What are you exploring with Sonnet 5.5?

@_re_pete would you mind also mentioning the effort level used, the cost, and how many tokens it consumes?

@_re_pete the evolution of humanity: sonnet 5.5 drew with javascript

@_re_pete My first try using Sonnet 5.5

@_re_pete Opus 5.5 + Sonnet 5.5 = AGI When Fable 5.5??

@_re_pete

@_re_pete One of our early experiments with Claude refused to stay small. It became LUNKER GUILD—a playable fishing world with 115+ mysterious fish and tackle that doesn’t exist in the real world. 🎣

@_re_pete built this component and really excited to work with Sonnet again open-source library coming soon:

@_re_pete I tested model against astra and it cooked

@_re_pete Everything was going perfect.. untill Sonnet 5.5 max

@_re_pete a lawn ornament versus a place you'd actually stand in, same prompt presumably

@_re_pete MODEL JUST DROPPED WHAT DO YOU MEAN ???

@_re_pete WHY same price with opus 5.5???? "cost per task"

@_re_pete one shot prompted marble game

@_re_pete Built this just now!

@_re_pete This version looks better than the previous one in terms of generation

@_re_pete Whoa, the difference between 5 and 5.5 really shows in those leaves. Kinda wild how much smoother the newer one looks. Makes me wanna go re-run some of my old prompts just to compare 👀

@_re_pete You should reset the usage, I def need to try it this new model

@_re_pete @_re_pete was this in threejs?

@_re_pete Looks like the trees finally got an upgrade, now they can brag about their better code than my Wi‑Fi. 😩

@_re_pete Here

@_re_pete La velocidad de respuesta sorprende bastante.

@_re_pete Foliage comparison shows better graphics. Turning an emoji into a physical object in hours proves the gap between "idea" and "product" is closing rapidly.

@_re_pete We're over the hump boys it gets 3d!

@_re_pete good job!

@_re_pete damn it's crazzyyy

@_re_pete The fact that Claude posted this shows just how excited they are with the results. Anthropic cooked hard with this agent

@_re_pete omg

@_re_pete Wow

@_re_pete The jump from “AI can generate code” to “AI can build an entire interactive visual experience” is insane. This is exactly why editors need to start learning AI workflows now.

@_re_pete Amazing! So exciting. Great work guys.