GPT-6.1 Terra vs GLM 5.3 Prime
GPT-6.1 Terra took 5 min 29 s and $0.15 at list price, GLM 5.3 Prime took 55 min 49 s and $3.43 at list price. GLM 5.3 Prime took 10× as long and cost 23× as much.
GPT-6.1 Terra
OpenAI · $5.00/M out · 721 HN pts
GLM 5.3 Prime
Z.ai · $8.80/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, dedicated to repairing vintage synthesizers and keeping them in use.
Old instruments have a way of becoming familiar: the feel of a key, the response of a filter, the particular sound a circuit makes when it’s working as it should. When something goes wrong, we take the time to understand both the fault and the instrument around it. We work carefully, preserving original parts wherever practical and making repairs with the long term in mind.
Our studio brings together a shared interest in electronics, sound and the machines that connect them. Whether a synthesizer has a stubborn key, a noisy output or has been silent for years, we’re interested in finding a way forward.
We work with musicians, collectors and anyone who wants to hear an old instrument come to life again. If you have a synth that needs attention, we’d be glad to hear about it.
Some of the machines we work on were built before any of us were born. Patchbay is a three-person repair studio in Rotterdam, and what we do is simple to describe: we keep vintage synthesizers playing. A Minimoog that sat in an attic for thirty years. A Juno-60 with keys that no longer speak. A modular system that hums where it should roar. Whatever comes through our door gets opened up, traced through, and brought back.
That means rebuilding power supplies, cleaning a thousand key contacts, chasing a fault across three boards until it turns out to be a single cracked solder joint. It means calibrating oscillators that have drifted for decades, and listening — really listening — until a filter sounds the way it did the day it left the factory.
We do this because these instruments still sound like nothing else, and because somewhere a player is waiting to hear one come back to life.
Specs and numbers
| GPT-6.1 Terra | GLM 5.3 Prime | |
|---|---|---|
| Maker | OpenAI | Z.ai |
| Made in | US | China |
| Released | 26 Oct 2026 | 23 Sep 2026 |
| Price in, per M tokens | $1.00 | $2.80 |
| Price out, per M tokens | $5.00 | $8.80 |
| Context | 1,050,000 tokens | 1,000,000 tokens |
| Weights | closed | closed |
| Hacker News points | 721 | — |
| Time for the six prompts | 5 min 29 s | 55 min 49 s |
| List price of the six prompts | $0.15 | $3.43 |
GPT-6.1 Terra was cheaper: $3.28 less at list price, and less on each of the 6 prompts. GPT-6.1 Terra was faster: 50 min 21 s less in total, and faster on each of the 6 prompts.
In the recording, both Breakout games play. GLM 5.3 Prime's landing page was cut off at the output limit (131,072 tokens).
Rebuild this screen experiment: GPT-6.1 Terra's rebuild matched the screenshot at 95%; GLM 5.3 Prime was not in it. Tea Garden experiment: GPT-6.1 Terra's game passed 5 of 5 checks; GLM 5.3 Prime was not in it.