Developers shared 7 projects built with Claude Opus 5.5, from a robot octopus that comes apart to a Turkish circuit simulator

Opus 5.5 and 3D work built in code

Anthropic announced Claude Opus 5.5 on Sept. 22 as the first model in its new Claude 5.5 family. The company says it performs at the level of Claude Fable 5.1 on most work and costs 40% less to run than Opus 5. API pricing is $4 per million input tokens and $20 per million output tokens. In Anthropic’s own testing, it scores 66.4% on Terminal-Bench 4.0, an agentic coding benchmark, versus 52.3% for Opus 5. According to the announcement, one tester had several Claude models build a game from a single prompt, and Opus 5.5 scored highest on graphics and polish.

Many of the projects shared on X since the launch are 3D scenes that run in the browser with three.js, an open-source JavaScript library that draws 3D graphics through WebGL. The six projects in this story were posted between Oct. 21 and Nov. 1 from the creators’ own accounts. Methods, time spent and lines of code are the creators’ own descriptions.

A robot octopus from a single picture

On Oct. 30, creator Fokki wrote that Opus 5.5 had turned a single picture into a robot octopus that comes apart piece by piece. Fokki says the only instruction was “make the model.” The picture set the look, and every part is three.js code. Before animating, the model rendered a still next to the picture and fixed the gaps over three rounds.

When the first pass looked like a toy, the model went back and packed 202 links and 480 wheels into 8 arms. According to Fokki, each arm is a single draw call. In the 25-second animation, a part opens every few seconds: the lens unscrews, the pump rises out spinning. The octopus blows apart and reassembles during a 330-degree turn. The code totals 2,616 lines.

The post quotes an X article by a user named Elvar about a free Claude skill that turns machines into 3D simulators that come apart. Fokki’s post does not name the skill or the prompt used.

Fokki@0x_fokki

Someone needs to stop Claude Opus 5.5. It turned one picture into a robot octopus I can take apart piece by piece.

i just said "make the model" and what came back floored me.

the build:

> the picture set the look, every petal, lens and link is three.js code
> opus rendered one still next to the picture and fixed the gaps for 3 rounds before it touched the film
> the first pass looked like a toy, so it went back and packed 202 links and 480 wheels into 8 arms
> every arm is one draw call, posed every frame by walking its chain of bends
> something opens every 2-3 seconds: the lens unscrews, the mantle hinges, the pump rises out spinning
> at 0:16 the whole thing blows apart on a 330° turntable and reassembles before the turn ends

25 seconds, 2,616 lines of code and one octopus that leaves the frame on its own.

the skill, the prompt and the live sim 👇

Elvar @elvar_official

x.com/i/article/2116…

A human eye drawn with math, not photos

Gianluca Lomarco, a creative developer at Studio Freight, posted on Oct. 26 that he had spent 7 days on a single human eye. He says it uses no textures, 3D models or photos, just math, light and about 400 parameters. It was built with three.js and Opus 5.5 in Claude Code. Lomarco stresses that it was not a one-shot: 161 commits and 4,455 lines of GLSL shader code. Every parameter range comes from published measurements, he says.

According to Lomarco, the iris is a 3D field raymarched behind the cornea. Its colors come from a Kubelka-Munk spectral model of the pigment layers, and eye colors differ only in melanin. Light refracts through both surfaces of the cornea before reaching the iris, so the iris shifts as the viewer orbits it, as in a real eye. The pupil reacts to light, and the eye blinks. A button generates a new eye from measured population data.

Gianluca Lomarco@__rockbiter

Everyone's using Claude Opus 5.5 to build entire worlds in #threejs.

I spent 7 days on a single human eye.

No textures. No 3D models. No photos. Just math, light and ~400 parameters.

Sound on 🔊 Link below 👇

A Dragon Ball-inspired browser game

On Oct. 23, Aniket J, co-founder of the game platform Crayon, shared an unofficial fan game called “Kid Goku: Beyond the Clouds.” It is a tribute to the first Dragon Ball episode, set on Mount Paozu. Aniket says it was built with Opus 5.5 and Crayon on three.js. Crayon presents itself as a studio that turns a single sentence into a playable web game, so the post also promotes the creator’s own platform.

According to the game page, young Goku runs home through Mount Paozu, joins Bulma, rides Capsule No. 9 and searches for the seven Dragon Balls. As of Nov. 6, the post had more than 679,000 views. On Aug. 24, Aniket had shared a similar Goku runner built with Opus 5.

Aniket J@aniketjart

Dragon Ball Super: Beerus made me build a fan runner game again! Something as a tribute to the first Dragon Ball episode at Mount Paozu. Created with Opus 5.5, @usecrayon on threejs!

Play here: app.usecrayon.ai/play/3a9001a5-…

13 circuit boards to build and break

On Oct. 21, creator Movez shared Robotics Bench, an interactive site built with Opus 5.5. It features 13 real boards, including the Arduino Uno, the L298N motor driver and the Raspberry Pi 5. Movez says the boards are built part by part: components are placed, reflow-soldered and plugged in. They can also be broken on purpose: reversed capacitors pop, chips smoke and LEDs burn out.

The site was made with April Zhu’s /colorfigures skill. According to Zhu’s page, this Claude skill turns a described object into a hand-inked, isometric drawing with buttons that actually work. Movez wrote that there is no need for a starter kit costing more than $1,000 to learn what a resistor does. When one user pointed out that about 50 euros is enough to start, Movez replied that it was just a hook to catch attention.

Movez@0xMovez

I just solved "Robotics Engineering" education with Opus 5.5 + /colorfigures skill

no need to spend $1000+ on a starter kit to learn what a resistor does, just visit my interactive site:

• 13 real boards: Arduino Uno, L298N, Raspberry Pi 5...
• build part by part: pick & place, reflow, solder, plug in
• break them on purpose: reversed caps pop, chips smoke, LEDs burn out

send the skill to your Claude:
> april-zhu.com/colorfigures

try it free, no sign-up ↓

Ronin @DeRonin_

x.com/i/article/2095…

A SolidWorks lookalike written in code

Solvaix, an account that says it tests how far AI can go in CAD, BIM and 3D, posted a sewing machine design on Nov. 1. According to Solvaix, Opus 5.5 controlled the cursor and modeled the machine step by step in an interface that closely resembles SolidWorks. No SolidWorks is involved, the creator says; Claude first built that interface itself, in the browser.

An Oct. 25 post from the same account explains the method. Solvaix says no CAD program, plugin or screen capture is running; Claude wrote the interface, the cursor and every click as code. The creator calls the environment a “fake CAD.” In other words, this is not a usable design program but a design session animated in code. Neither post links to a live version or to the code.

In the Oct. 25 project, Claude designed a watch movement inside that interface. According to Solvaix, its gear train runs at 5,760 to 1. At one point Claude set the mainspring about 70 times too weak, then compared it with real Swiss specs and fixed it. SolidWorks is professional CAD software from Dassault Systèmes; Solvaix’s interface only imitates its look.

Solvaix@Solvaix

CLAUDE OPUS 5.5 CONTROLLED THE CURSOR AND DESIGNED THIS SEWING MACHINE

No SolidWorks here. Claude first built a CAD environment that looks almost exactly like SolidWorks, right in the browser, then designed the machine inside it.

Drawing in JavaScript, without an image model

On Oct. 29, Mickey Friedman shared “Solarpunk Lizards,” an animated illustration drawn with Opus 5.5 in pure JavaScript. It shows cabins, glass domes and windmills over treetops at sunset, home to axolotls, cats and little ghosts. Friedman found it funny that Claude had come full circle to making art without an image model, just by being good at code. On Oct. 23, he had shared an ink drawing of a working factory, cut open in cross-section.

Friedman stresses that the model did not do it alone. In replies, he said the drawing took hundreds of prompts and that he, not Opus, placed every object. The prompts were mostly words, sometimes with example images. Neither page loads any image files; the drawings are generated from JavaScript files. However, comments in the code say some layers, such as the sky and the treetops, were traced from reference drawings by scripts and turned into data.

mickey friedman@mickeyxfriedman

funny how claude horseshoe'd itself into making art without an image model just by being good at code

drew this with opus 5.5 in pure javascript

A Turkish circuit simulator

Yiğit Kasap, a physics student at Akdeniz University, built an educational circuit simulator in Turkish that runs in the browser. According to Kasap, Opus 5.5 wrote all of the code in Claude Code, while he made the decisions, steered the work and reviewed it. The project’s live main branch has 253 commits since Oct. 12, 2026, and every one lists Claude Opus 5.5 as a co-author.

The simulator was built for the electronics lab of Akdeniz University’s physics department, and all nine experiments from the lab manual are included as ready-made circuits. It does not use an existing simulator. Its own solver uses nodal analysis with adaptive time steps, and its diode, transistor and op-amp models are compared against ngspice. The project page lists more than 1,600 automated tests and 71 physics checks.

Highlights

• 45 component types and 79 ready-made circuits under Examples
• A two-channel oscilloscope, a function generator and a dual-output DC power supply
• Arduino Uno: the ATmega328P runs instruction by instruction, with 11 sample programs
• 3D bench: the circuit sits on a breadboard, with live LEDs and instrument displays
• Export to board: a soldering guide for perfboard, two-layer PCB fabrication files and export to KiCad

The simulator is free, needs no installation, and its code is open under the MIT license.

Cover image generated with AI.