Issue No. 02 · Anthropic · 22 Sept 2026
Claude Opus 5.5
examples & demos
Claude Opus 5.5 arrived on 22 September 2026 as Anthropic's new daily driver, at 40% lower cost than Opus 5. Builders answered with browser games, formal proofs, LEGO designs and lens simulators. Here is the best of that wave.
At a glance
- Released 22 September 2026 by Anthropic
- $4 / $20 per million input / output tokens
- First model in the Claude 5.5 family
- 36 verified works
- Official announcement ↗
The top ten
- 01
It gets an awkward detail right: the image on the back glass is drawn upside down, as a real lens projects it, and the console screens flip it back the way a camera does. The “valley” is a tabletop model about 60 cm from a 50 mm lens, and the aperture runs from f/2 to f/16. - 02
There are no words at all. An ant nurses one seed into a melon through a lightning storm and a flood, tally marks on the sky count the days, and the last shot returns to the opening slice with a second, smaller ant beside it. - 03
Captioned like a lyric video, it runs through AI-safety in-jokes: Sydney, a P(doom) curve, a paperclip counter near a billion, a chorus of “You’re absolutely right”. The date stamp in the corner climbs from 2019 to 22 September 2026, the day Opus 5.5 came out. - 04
Thirty-two seconds, bookended by a small orange box creature on blank paper; in between, the clip cuts from a neuron to a sunflower’s seed spiral to a black hole. Nothing on screen says which part is the footer. - 05
The booklet is the part you can see. The post adds that it priced every piece and prepared the BrickLink orders, and checked that the centre of mass falls inside the feet, which is what decides whether a two-legged figure stays up. - 06
Almost seven weeks before Fable’s What the Water Keeps, this was already a lantern-lit boat ride. Here the boatman stands at the stern in a straw hat, and the route goes past a pagoda, under a red bridge and into mist, ending at night with lights floating on the water. - 07
Same grass, two moods: Opus lit its field as a hazy late afternoon and kept the fighters small and far off, while Astra planted red maples and boulders and filled the frame with straw-hatted enemies. The post does not pick a winner. - 08
All of it happens in a Slack thread, with Claude tagging @boris when a pull request needs his approval. The closing card reads 6 Lean models, 1,529 theorems and 0 sorry (Lean’s placeholder for a proof left unfinished), with 24 bugs fixed, 19 of them found by the proofs. - 09
Claude appears as the orange spark from its own logo, cut from paper. Its answers arrive one card at a time, music, bread, an octopus, and on the last sign the word “you” is circled. - 10
The creator calls them Mario and Luigi. The select screen says Blaze and Zippy, alongside Toadly, Grumbo and Koopz, in a game titled Turbo Kart Rally whose first track is Palm Cove Circuit.
Every work in this issue
Games
No. 06
A boat ride through Japanese landscapes
by Meng To · @MengTo
No. 10
A one-shot kart racer
by BridgeMind · @bridgemindai
No. 11
A game about the Antikythera mechanism
by edwin · @edwinarbus
No. 13
A Dark Souls-style world in Unreal
by Alex · @The_Alex
No. 16
Voxel Musou: Zhao Yun vs 300 soldiers
by BubuAi · @BubuStd
No. 29
Vibecode Bench: RTS, voxel and flight sim
by Senko Rašić
No. 30
A pelican’s coastal bike ride
by riba2534 · @riba2534
No. 31
CrossFire “Transport Ship” in the browser
by riba2534 · @riba2534
No. 32
A QQ Speed-style drift racer
by riba2534 · @riba2534
No. 33
A playable Pokémon-style card game
by Brian (Forward Future) · @ForwardEditor
No. 34
Tidekeeper
by Brian (Forward Future) · @ForwardEditor
3D & worlds
Film & animation
No. 02
A short story about a watermelon
by Claude · @claudeai
No. 03
One spoken prompt, 12 hours of work
by donald · @donaldjewkes
No. 09
“What do you love?”
by Kevin Ngo · @kevin_t_ngo
No. 12
Blender claymation from one prompt
by Alex Albert · @alexalbert__
No. 14
Realistic Minecraft × Star Wars
by Chris · @ChrisGPT
No. 17
A motion video in 19 minutes
by David Ch · @chhddavid
No. 24
A sand-art animation from one prompt
by Michael Guo · @Michaelzsguo
Claude Opus 5.5 · FilmI’m Upping My P(doom)No preview — open the original
No. 35
I’m Upping My P(doom)
by John Heibel
Interactive
Tools
Research & science
Model comparisons
No. 07
Samurai game: Opus 5.5 vs GPT-6 Astra
by Higgsfield AI 🧩 · @higgsfield_ai
No. 19
Concept to playable in Unreal: Opus 5.5 vs GPT-6 Astra
by Higgsfield AI 🧩 · @higgsfield_ai
No. 20
Dogsled racer: Opus 5.5 vs GPT-6 Sol
by Higgsfield AI 🧩 · @higgsfield_ai
No. 25
“Build a night train”: four models
by Tony · @EnvolDev
No. 27
“Build a rocket launch”: four models
by Tony · @EnvolDev
No. 28
Pebble: a launch site for a console that doesn’t exist
by noclipepe · @noclipepe
No. 36
Design-to-HTML: one mockup, four models
by jjcm