Hy4 vs GPT-6.1 Terra
Hy4 took 16 min 15 s and $0.15 at list price, GPT-6.1 Terra took 5 min 29 s and $0.15 at list price. Hy4 took 3.0× as long, and both cost about the same.
Hy4
Tencent · $1.25/M out · 404 HN pts
GPT-6.1 Terra
OpenAI · $5.00/M out · 724 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 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, 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.
Specs and numbers
| Hy4 | GPT-6.1 Terra | |
|---|---|---|
| Maker | Tencent | OpenAI |
| Made in | China | US |
| Released | 4 Nov 2026 | 26 Oct 2026 |
| Price in, per M tokens | $0.417 | $1.00 |
| Price out, per M tokens | $1.25 | $5.00 |
| Context | 1,048,576 tokens | 1,050,000 tokens |
| Weights | open | closed |
| Hacker News points | 404 | 724 |
| Time for the six prompts | 16 min 15 s | 5 min 29 s |
| List price of the six prompts | $0.15 | $0.15 |
Both cost about the same at list price: $0.15 and $0.15. GPT-6.1 Terra was faster: 10 min 46 s less in total, and faster on each of the 6 prompts.
In the recording, both Breakout games play.
Rebuild this screen experiment: Hy4's rebuild matched the screenshot at 79%, GPT-6.1 Terra's 95%. Tea Garden experiment: Hy4's game passed 5 of 5 checks, GPT-6.1 Terra's 5 of 5.