Kimi K3.1 Pro vs GLM 5.3 Flash
Kimi K3.1 Pro took 32 min 17 s and $1.27 at list price, GLM 5.3 Flash took 59 min 10 s and $0.037 at list price. GLM 5.3 Flash took 1.8× as long, and Kimi K3.1 Pro cost 34× as much.
Kimi K3.1 Pro
Moonshot AI · $10.00/M out · 1,168 HN pts
GLM 5.3 Flash
Z.ai · $0.148/M out · 1,329 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 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.
Patchbay began the way most repair shops do: with a broken synth, a stubborn owner, and a soldering iron that refused to stay idle. We're three people—Joris, Marit, and Tomas—working out of a small workshop on the back streets of Rotterdam-Noord, surrounded by oscilloscopes, spare parts, and instruments that sometimes arrive in worse condition than their owners admit.
Between us, we've spent decades repairing and restoring vintage synthesizers: Rolands, Moogs, Korgs, Yamahas, and machines whose manuals were never written in the first place. We don't sell anything. We fix things. That focus keeps us honest and keeps the work slow, careful, and done properly.
We believe old instruments deserve to keep making music, not gather dust in attics or fetch prices only collectors can pay. Whether it's a cracked keybed, a dying power supply, or a voice that's gone quiet, we'd like to help bring it back.
Specs and numbers
| Kimi K3.1 Pro | GLM 5.3 Flash | |
|---|---|---|
| Maker | Moonshot AI | Z.ai |
| Made in | China | China |
| Released | 23 Oct 2026 | 26 Aug 2026 |
| Price in, per M tokens | $2.00 | $0.016 |
| Price out, per M tokens | $10.00 | $0.148 |
| Context | 1,048,576 tokens | 1,048,576 tokens |
| Weights | closed | open |
| Hacker News points | 1,168 | 1,329 |
| Time for the six prompts | 32 min 17 s | 59 min 10 s |
| List price of the six prompts | $1.27 | $0.037 |
GLM 5.3 Flash was cheaper: $1.23 less at list price, and less on each of the 6 prompts. Kimi K3.1 Pro was faster: 26 min 53 s less in total, and faster on 3 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 Flash was not in it. Tea Garden experiment: Kimi K3.1 Pro's game passed 5 of 5 checks; GLM 5.3 Flash was not in it.