On June 9, 2026, Anthropic opened Claude Fable 5 to the general public — the public version of a Mythos-class model, the most powerful tier in the company's lineup, surpassing Claude Opus in capabilities. Just three days later, on June 12, Anthropic shut down Fable 5 for all users at the request of U.S. authorities over export controls. Despite its short period of operation, developers, researchers, and enthusiasts managed to build impressive projects on the new model — from games recreated from machine code to simulations with tens of thousands of objects.

The BeInCrypto editorial team has compiled a top-10 list of examples of what Fable 5 turned out to be capable of.

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A Full Hogwarts in a Single Prompt

A user recreated the castle from the Harry Potter universe in full with a single prompt. The project included the houses, the Great Hall, and a Quidditch pitch — the entire structure was generated in one go with no further tweaks.

A Storyboard Generator for Filmmaking

The tool turns a submitted form into ready-made shots of work prompts for GPT Images 2.0. The author set it up to be invoked as a Skill at any moment, and used the resulting storyboard as a reference for video in Seedance 2.0. This entire work chain runs without manual intervention: first the idea, then the shots, then the images.

A Faster-Than-Light Travel Simulator

The author's final prompt before Fable was shut down generated a visual demonstration of various ways of moving faster than light — from well-known science-fiction inventions to scientific hypotheses. The model assembled a visually polished simulation with warp drives and wormholes in a single pass.

Reverse-Engineering a DOS Game from Machine Code

Fable 5 took apart a 1993 game for which no source code existed: it read the raw machine code, rewrote the engine in C, and produced a fully editable port for various platforms. From the original EXE file to an iPhone version took about 30 minutes.

Source: BeInCrypto