GLM 5.3 FlashX Legal vs Kimi K3.1 Pro
GLM 5.3 FlashX Legal took 45 min 14 s and $0.42 at list price, Kimi K3.1 Pro took 32 min 17 s and $1.27 at list price. GLM 5.3 FlashX Legal took 1.4× as long, and Kimi K3.1 Pro cost 3.1× as much.
GLM 5.3 FlashX Legal
Z.ai · $1.25/M out
Kimi K3.1 Pro
Moonshot AI · $10.00/M out · 1,168 HN pts
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 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.
Patchbay is a three-person studio in Rotterdam devoted to keeping vintage synthesizers alive, playable, and full of character. We work on instruments that have spent decades in studios, bedrooms, and tour cases, and we believe each one deserves more than a quick fix. From drifting oscillators and noisy sliders to tired keybeds and mysterious faults, we take the time to listen, diagnose, and repair with care.
Our approach combines patient troubleshooting, period-correct components where possible, and a deep respect for the original sound. We do not believe in erasing an instrument’s history; we preserve the quirks that make it worth loving. Whether your synthesizer needs a full overhaul or a little help getting back on stage, you will always know who is working on it and why. Patchbay exists for the joy of switching on an old machine and hearing it come back to life.
Specs and numbers
| GLM 5.3 FlashX Legal | Kimi K3.1 Pro | |
|---|---|---|
| Maker | Z.ai | Moonshot AI |
| Made in | China | China |
| Released | 2 Nov 2026 | 23 Oct 2026 |
| Price in, per M tokens | $0.37 | $2.00 |
| Price out, per M tokens | $1.25 | $10.00 |
| Context | 1,048,576 tokens | 1,048,576 tokens |
| Weights | closed | closed |
| Hacker News points | — | 1,168 |
| Time for the six prompts | 45 min 14 s | 32 min 17 s |
| List price of the six prompts | $0.42 | $1.27 |
GLM 5.3 FlashX Legal was cheaper: $0.85 less at list price, and less on each of the 6 prompts. Kimi K3.1 Pro was faster: 12 min 57 s less in total, and faster on 5 of the 6 prompts.
In the recording, both Breakout games play.
Rebuild this screen experiment: Kimi K3.1 Pro's rebuild matched the screenshot at 87%; GLM 5.3 FlashX Legal was not in it. Tea Garden experiment: Kimi K3.1 Pro's game passed 5 of 5 checks; GLM 5.3 FlashX Legal was not in it.