A pixel game map animated down to fountain ripples and cave bat eyes

A game that follows the discovery of the Antikythera mechanism, the ancient Greek astronomical calculator called the first computer. All visuals and sound are generated by code in real time.

A full game fits in a single 3MB HTML file, with no image files and no audio files.

A multiplayer lawnmower simulator with beer and cigars was built, put on the creator's own server and played right away with viewers gathered in the chat.

Right where it was built, a game with many players connected at once went straight into operation.

An anime-style fighting game was made inside Roblox from a single request. It used only Roblox's built-in tools.

Even with only the built-in tools, one request produces a full round of a fighting game.

These are games made with a pre-release copy of Opus 5.5 and Unreal Engine. The first is a Dark Souls-style action game.

Its reach extends to full-scale action games built in a major game engine.

This is a guitar store simulator. Make too much noise and it turns into a side-scrolling beat 'em up where you walk sideways and fight.

It made more than 300 different guitars, and every one of them can actually be played.

It got a single instruction: 'Build a calm 3D world that generates randomly without end, set your own goals, and play a notification sound when you are done.'

It carried a long task through to the end, even with what to build and when to stop left to the model.

A racing game built from a single prompt: 'Spin up 5 subagents and make a AAA-quality game like Mario Kart.' You can play it right in the browser.

The model split the work five ways, handed it off, merged it back together and finished a game.

A DOOM clone that runs in the browser, built together with an autoplay AI that beats the game on its own. The autoplay won 8 of 8 games with an average hit rate of 93.4%.

It built a game and a program that plays through it, together.

Opus 5.5, Fable 5.1 and GPT-6 Astra were each asked to build a flight simulator, a Minecraft-style voxel game and a real-time strategy game in a single attempt, and the results were posted side by side. For Opus 5.5, each game took 46 to 48 minutes and cost $11 to $14.

Anyone can play and compare the results of top models on the same task.

A Pokémon FireRed opening where the Anthropic mascot fights the OpenAI mascot, complete with animation and sound. The prompt was a single unpolished line, and the cost was $5.47.

A one-line request produces a complete opening sequence.

A world on a small planet, made in 14 minutes with no separate tools. At API rates, that comes to $2.54.

In a short time and at low cost, you get a world you can explore yourself.

No genre was set. The only request was 'make a fun game.' The model chose on its own to build a game in the style of the neon shooter 'Geometry Wars.'

The model also takes on choosing what to build.

A Minecraft-style block game made by Opus 5.5 runs in a web browser. Between a sea lit by the sunset and grassy hills, the player picks blocks from the block bar at the bottom (the hotbar) and builds a glass structure.

It fits the light and water effects seen in installed games into a single browser window.

With one sentence per game, Opus 5.5 in Claude Code made a game about a pelican riding a bicycle, a first-person shooter (FPS) that recreates CrossFire's transport ship map, and a QQ Speed-style racing game. The model did everything alone in one conversation, from research to writing code, testing and deploying to Cloudflare Pages, and no human changed a single line of code.

3D games made from code alone, with no image or sound files, can be published right away from a one-sentence request.

A Minecraft-like block world game made with Opus 5.5 and published at a single web address. A first-person view with flowers, sheep and cows on grass shaded by trees, plus health and hunger bars, runs inside the browser.

One person can now build a 3D game that anyone can play just by opening a link, with nothing to install.

Starting from a pun that swaps 'girlfriend' for 'grill', Opus 5.5 made a gacha game (a game where you collect characters through random draws) that pulls anime-style barbecue grills. The video shows a brazier grill wrapped by a dragon being pulled at UR, the highest rarity.

Even an idea as small as a one-line joke can go straight into a gacha game, complete with rarity effects.

A 3-minute look at a Spider-Man-style 3D game made with Opus 5.5 Medium and Three.js (a JavaScript tool for drawing 3D on the web). The 3D models, textures (surface patterns) and animations in this game of roaming city rooftops were all made from scratch.

Without premade art or models, one person working with AI can build an action game set across a city.

Opus 5.5 made Blockwild, a Minecraft-like block game, as a claude.ai artifact (a small app that runs right inside the chat window). You can fly around a world of trees, grass and sand dunes, and it has water physics and realistic game rules.

The model builds a 3D block game that anyone can play by opening a single link, with nothing to install.

A 3D dogsled racing game made with Opus 5.5 on Higgsfield. It was placed next to a game GPT-6 Sol made on the same theme, and the Opus 5.5 version included snowy mountains under the aurora, race standings, a speedometer and obstacle warnings.

Given the same theme, the polish of the game screen differs visibly from model to model.

A first-person shooter made from a single request to Opus 5.5. In a world like notebook doodles decorated with pencil and colored paper, you use an ink gun, a sword, a grappling hook and a dash to survive 3 stages of enemy attacks, and a boss appears at the end.

A full game with an art style, controls, stages and a boss fight can come from a single request.

Opus 5.5 built a basketball game like NBA 2K using Three.js (a tool for drawing 3D in the web browser) and Genex's game development tools for agents (AI that works through multiple steps on its own). In an arena with stands and a scoreboard, you move players and take shots, and a shot timing gauge judges each shot.

The feel of a sports game from a big studio can move into a web game you can play right away from a single link.

A casual game where you are a pressure washer, cleaning dirty floors while avoiding flower beds, cars and cats. The 3D models were prepared with Blender and Tripo (an AI tool that makes 3D models from text or images), and the game was written with Rust, Wasm (a code format that runs fast in the browser) and WebGPU (a technology for using the graphics card from the browser). It plays right away in a phone browser too.

An individual developer working with Opus 5.5 can release a 3D game built with a demanding language and the latest graphics technology, playable by anyone from a single link.

A single request to Opus 5.5 produced a 3D game resembling the popular game Fortnite. It includes a sky bus flying over an island, a minimap showing when the storm will arrive, a health bar and item slots.

A single request can set up the basic frame of a battle royale (a game where many players land on an island and compete until one is left).

Opus 5.5 and GPT-6 Sol, released the same day, got the same one-page English brief and were asked to make a side-scrolling platformer (a game where you run sideways and jump across platforms) and a rhythm game. Each ran to the end in one go with no human intervention, and the time, errors and API (a way to call the model from a program) costs were measured. The models then graded each other's work with names hidden, and the 4 unedited games are playable.

Instead of marketing copy, you can compare the two models side by side through games and cost receipts produced under the same conditions.

Without writing a single line of code, one prompt produced a 3D game about driving an auto-rickshaw (a small three-wheeled taxi) through the crowded streets of Pune, India. You dodge potholes, cows and wrong-way motorbikes while picking up chai (Indian milk tea) and passengers, and a second prompt added features.

Someone who has never coded can make a 3D game of their own neighborhood in a few exchanges and share it right away.