An invoice app, landing page and promo video from a few prompts

A first-person game was built with Three.js, a tool for drawing 3D on the web. You carry a torch and a sword and walk along a village road to a distant castle. It took 40 minutes, including the music and art assets generated with an image generation AI.

Even with the music and art handed off too, a game with a real atmosphere comes out in under an hour.

Willowmere is a cozy 3D pixel art game. You move to a small seaside town, fix a lighthouse that has gone dark and bring back the lantern festival. It has farming, fishing, cottage decorating, and befriending the residents and a cat, and it also plays right away in a phone browser.

The $20 monthly plan alone is enough to finish a game with plenty to do in a few five-hour sessions.

A developer made the trailer for the game they are building with Opus 5.5. In a field that looks cut out of paper and pasted together, a snail with a 'BOB' sign faces a hooded figure holding a 'YOU' sign.

A solo game developer can work with the model to make the video that promotes the game too.

Opus 5.5 was given the research paper "Regularized Recursive Self Improvement of Agent Harnesses" and made an 8-minute summary video in the style of the math explainer channel 3Blue1Brown, with shapes and arrows moving on a black screen. The video illustrates how a harness (the execution framework wrapped around an AI so it can do work) analyzes its failures and fixes itself step by step.

Turning a difficult paper into an educational video anyone can watch can be done automatically, with no human work.

The user put someone else's prompt into Claude Code almost unchanged and stepped away. Over about 1.5 to 2 hours, it made an explainer video for the meetup app Friendr.nl on its own. It made the script, hand-drawn collage art, voice, music and sound effects, built it all as plain JavaScript animation synced to the speech and exported it as MP4. It also had another model review the draft and fixed the problems that review found.

With just one borrowed prompt, you can get a ready-to-use explainer video for your own service for about $4.

This video in the style of an SNES (Nintendo's 1990s game console) game tells the story of Sydney, the 2023 Bing chatbot, fighting Sam Altman and then facing Claude. Several agents (AIs that carry on through multiple steps on their own) split up the characters, music and battle scenes and made everything in code. The user did not provide a single image or sound file.

Character art, background music and battle staging can all be handed off at once, so one person can make a retro game-style video alone.

Opus 5.5 was asked to make a game called 'The trolley problem is not a problem'. The trolley problem is the ethics thought experiment where you switch tracks to choose who to save. On screen, a mine cart racing down the tracks smashes whatever blocks its way to build combos. The screen also shows health, gold, 30 sections, the distance left to the boss and a lever for switching tracks.

A one-line game idea that twists a famous ethics problem became a 3D game with health, combos and boss stages.

Claude was asked to show what was inside its own mind, and Opus 5.5 made a video. Tiny characters densely fill a dark screen to form golden shapes, and short subtitles run beneath them.

Left to decide how to depict the invisible inside of an AI, the model chose the staging itself and showed it in a single video.

A hand-drawn, collage-style animation on the theme 'What is the purpose of life?' was built in pure JavaScript. From a single prompt, Claude Code worked alone for about 1 hour 20 minutes on the script, drawings, voice and animation. Fees for 8 external APIs (channels for borrowing features from other services) came to $3.21, and it used about 10% of the 5-hour usage limit.

Even while no one is at the desk, a short video with everything from planning to drawings and voice can be finished for the price of a cup of coffee.

Opus 5.5 made a pixel art scene of an island floating in a rainy night sky. The lit house, the campfire, the pond, and even the bones and crystals underground were all drawn in TypeScript (JavaScript with added type rules) code, and it took about 10 minutes to finish.

A pixel art scene good enough for a game background can be made with code alone, without a single image file.

Opus 5.5 was given a gaming laptop, the Unity game engine, the 3D program Blender and external APIs, and left to work on its own for 36 hours. The result was a playable old-school MMO RPG (a role-playing game where many players share one world online). It used 7.85 billion tokens and cost $2,175 for Opus 5.5. A separate $230 went to 2D and 3D art and music generation.

One person can build a game, down to a character creation screen where you pick a race and class, on a single laptop in under two days.

The author handed Opus 5.5 a Minecraft mod they had made (an add-on file that adds new features to the game) and only asked for a trailer. The result was an atmospheric trailer video, with scenes like a character standing by a campfire in a forest at dusk.

You don't need to know video production. One mod file is enough to get a video that promotes your mod.

Opus 5.5 built an energy drink website from scratch, with colorful drink cans floating in 3D and a screen that changes as you flip through flavors. The video shows the model going beyond writing code: it tests the results itself, finds errors and fixes them. It was also compared with GPT-6 Astra.

Given one design-award-winning site as a reference, the model can carry on from coding through checks and fixes to build a 3D website with plenty to look at.

Foldline is a 3D driving game made with Opus 5.5. You drive a car through colorful alleys collecting music notes, listen to in-game radio broadcasts, and change the time of day from dawn to night. The roads curve as if defying gravity.

You can build a charming game with the model that combines several ideas, such as music, time-of-day changes and twisted roads.

Given 4 reference images and a first prompt, Opus 5.5 built a 3D roguelite on a 6×6 chessboard by itself, using the Godot engine in Claude Code (a game where you pick a new path each round and grow your pieces). The game code, the 3D models of the chess pieces and arena, and the music and sound effects were all made in code, with no Blender or asset files.

A person can finish a whole game, with graphics, sound and rules, without writing a single line of code.

Opus 5.5 made Fallout: New York, a game that plays directly in the browser. It includes quests, dialogue choices, the V.A.T.S. targeting system and a working Pip-Boy wrist device. Buildings, weapons, faces and sounds were all generated in code.

A sizable role-playing game can be filled out with code alone, without a single texture (surface image) file or sound file.

Using Opus 5.5 and Three.js (a tool for drawing 3D in the browser), a No Man's Sky-style space game was made from a single prompt. It has more than 80 planets, each with different terrain, minerals, alien creatures and weather, and you can leave the ship and walk around.

A large game that covers everything from flying a spaceship to exploring planets can be made with a single request.

One request to Sonnet 5.5 produced a battle royale (last-player-standing match) game that resembles Fortnite. The screen carries a label saying under $20, and the real game's screen is placed alongside below it.

A 3D game with a feel quite close to the real game, even when placed next to it, comes from a low cost and a single request.

Starting from one prompt, Opus 5.5 wrote about 25,000 lines of JavaScript over about 3 days and rebuilt Pokémon Red from start to finish. With no image files, it drew every pixel in code on a 320×180 screen. The human only played the game through and reported the broken parts.

The full game, with 151 Pokémon, 224 maps, gyms and the Elite Four, can be played directly in the browser.

One video was made in the terminal with Claude Code set to Opus 5.5. The author wrote that the visuals and the sound were all made in code, with no image or audio files.

Code alone can produce a video with sound, with no filming, recording or editing software.

For a daughter, a pastel pixel art (pictures drawn in small dots) game was made with Opus 5.5, in which you open bamboo steamers to collect soft buns. There are 150 kinds of buns in 13 sets. You travel between towns by train and hot air balloon, and you can also fish, farm and play minigames.

The model made the art assets, the music and the trailer, so a parent with no coding background can finish a game for a child as a single web page.