Hy4 vs GLM 5.3 FlashX Legal
Hy4 took 16 min 15 s and $0.15 at list price, GLM 5.3 FlashX Legal took 45 min 14 s and $0.42 at list price. GLM 5.3 FlashX Legal took 2.8× as long and cost 2.7× as much.
Hy4
Tencent · $1.25/M out · 404 HN pts
GLM 5.3 FlashX Legal
Z.ai · $1.25/M out
Pelican
Generate an SVG of a pelican riding a bicycle
Watch
Draw a mechanical wristwatch that shows the current local time, with a sweeping seconds hand and a date window. Make it look expensive.
Landing
Build the landing page for Lumen Cycles, a Copenhagen workshop that builds custom cargo bikes to order. Make it look like a real brand you would trust with 4,000 euros.
Breakout
Make a Breakout game I can play right now with the keyboard or the mouse. Give it several levels, a score and some juice.
Logo
Design a logo for Night Heron, an independent bookshop that only opens after dark.
About
Write the opening of the About us page for Patchbay, a three-person studio in Rotterdam that repairs vintage synthesizers. About 150 words.
Patchbay is a three-person studio in Rotterdam repairing vintage synthesizers and the odd drum machine or piece of studio equipment. We look after instruments that have survived tours, basements, and years of silence in cupboards. Our task is not to make them new, but to make them dependable while keeping the character that made them worth saving.
Every repair starts with listening: to the fault, to the owner, and to the instrument itself. From there we diagnose carefully, solder cleanly, calibrate patiently, and replace parts only when necessary. Between us we bring electronics, restoration, design, and studio experience, which keeps the work practical, unhurried, and attentive to small details. We document what we find, source components with care, and explain the work in plain language. Some jobs take an afternoon; others become long conversations with forty-year-old circuits. In each case, the goal is simple: return the machine to the hands, recordings, and rooms where it belongs.
Patchbay is a three-person studio in Rotterdam devoted to the repair and restoration of vintage synthesizers. We work on the machines that shaped the sound of the last fifty years — Roland, Moog, Yamaha, Korg, EMS, and the rest — from the rare and legendary to the well-loved and well-worn.
We started the studio because these instruments matter. They were built to be repaired, with discrete components, schematics, and construction that reward patience and care. Somewhere along the way, that way of making things fell out of fashion. We think it's worth keeping alive.
Every synthesizer that comes through our door is treated the same way: carefully diagnosed, honestly assessed, and repaired with respect for its original character. No unnecessary modifications, no shortcuts that compromise the instrument. Whether it's a failed voice chip, a dead key, or years of dust and neglect, our job is to put the machine back in the hands of the people who play it.
Specs and numbers
| Hy4 | GLM 5.3 FlashX Legal | |
|---|---|---|
| Maker | Tencent | Z.ai |
| Made in | China | China |
| Released | 4 Nov 2026 | 2 Nov 2026 |
| Price in, per M tokens | $0.417 | $0.37 |
| Price out, per M tokens | $1.25 | $1.25 |
| Context | 1,048,576 tokens | 1,048,576 tokens |
| Weights | open | closed |
| Hacker News points | 404 | — |
| Time for the six prompts | 16 min 15 s | 45 min 14 s |
| List price of the six prompts | $0.15 | $0.42 |
Hy4 was cheaper: $0.26 less at list price, and less on 5 of the 6 prompts. Hy4 was faster: 28 min 59 s less in total, and faster on 5 of the 6 prompts.
In the recording, both Breakout games play.
Rebuild this screen experiment: Hy4's rebuild matched the screenshot at 79%; GLM 5.3 FlashX Legal was not in it. Tea Garden experiment: Hy4's game passed 5 of 5 checks; GLM 5.3 FlashX Legal was not in it.





