8 must-see cases

It moved HAProxy, the open-source tool that distributes requests in front of web services, from C to Rust in full. It passed nearly all of HAProxy's own tests in 9.5 hours, while Fable 5.1 took 12 hours on the same job.

It finished a migration that would take a human team weeks faster than a more expensive model, at 51% lower cost.

Ten Opus 5.5 agents (AI that carries on through multiple steps on its own) devised C-HD, a faster shortest-path algorithm. They completed the proof in Lean, a language in which a computer checks every line, and the whole effort took 15 hours.

It produced a new result that goes beyond a limit stated in a paper, with a machine-verified proof attached.

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.

An app that turns a photo or description into a buildable block model with step-by-step instructions. A 2,874-part model came out as 487 steps in a 498-page manual.

Of the 15,880 places where parts connect, not one was flagged as a problem, so the manual actually builds.

It recalculated in 3D the moment Apollo 8 photographed Earth rising from lunar orbit, using only clues in the photo and public data. After matching 2,781 points, it pinned the shot to about 69 miles above the Moon at 16:39:39 UTC on December 24, 1968.

It solved the clues left in a single photo with orbital calculations and found where and when it was taken.

From a single prompt, it recreated San Francisco's Market Street just before the great 1906 earthquake in Blender.

It goes beyond a single building and builds a whole street that is accurate to the period.

Opus 5.5 led the entire production and handed images (Midjourney), music (Suno), and Cantonese dialogue and sound effects (ElevenLabs) to other AIs to finish a horror short. It took about 2 hours 30 minutes from prompt to finished film.

It can even take the director's role, managing several AI tools.

From a single request to explain how camera focus works, it worked for 1 hour 26 minutes and built a hands-on 3D lens lab web page. Turning the focus ring moves the glass elements inside the lens and shifts the plane in sharp focus forward and back through the scene. The API (the way programs call the model) cost $25.66.

In one pass, it turned optics that are hard to follow in text into a teaching tool you learn by turning it with your hands.