GPT-6.1 Terra Pro vs Gemini 3.8 Flash
GPT-6.1 Terra Pro took 6 min 58 s and $0.39 at list price, Gemini 3.8 Flash took 8 min 33 s and $0.32 at list price. Gemini 3.8 Flash took 1.2× as long, and GPT-6.1 Terra Pro cost 1.2× as much.
GPT-6.1 Terra Pro
OpenAI · $5.00/M out
Gemini 3.8 Flash
Google · $4.13/M out · 1,293 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 dedicated to repairing vintage synthesizers. We work on the instruments that have shaped decades of music, from well-loved studio staples to curious machines that have spent years in storage.
Old synthesizers develop problems in their own ways. A key stops responding, a filter drifts, a power supply gives out. We take the time to trace the fault, understand the instrument and make a repair that respects how it was built. Wherever possible, we preserve original components; when a part needs replacing, we choose with care.
We know these instruments are more than collections of circuits. They carry sounds, habits and memories, and each one has a story before it reaches our bench. Whether you rely on yours every day or are hoping to hear it again after a long silence, our aim is to help you get back to making music.
Tucked away in Rotterdam, Patchbay is a three-person repair studio dedicated to the preservation and revival of vintage synthesizers. We believe that classic instruments are living machines rather than museum relics—tools built to inspire, create, and be played loud. Between the three of us, we combine decades of experience in electronics engineering, sound design, and meticulous craftsmanship. Whether tracking down elusive voice chips for an eighties polyphonic giant, rebuilding power supplies, or recalibrating the drift on a cantankerous monophonic circuit from the seventies, we treat every piece of gear with obsessive attention to detail. Our workbench is built on a deep respect for historical engineering and a refusal to cut corners. For musicians, producers, and collectors across the Netherlands and beyond, Patchbay is where forgotten circuits find their current again, keeping the tactile soul of analog synthesis alive and resonant.
Specs and numbers
| GPT-6.1 Terra Pro | Gemini 3.8 Flash | |
|---|---|---|
| Maker | OpenAI | |
| Made in | US | US |
| Released | 26 Oct 2026 | 2 Sep 2026 |
| Price in, per M tokens | $1.00 | $0.825 |
| Price out, per M tokens | $5.00 | $4.13 |
| Context | 1,050,000 tokens | 1,048,576 tokens |
| Weights | closed | closed |
| Hacker News points | — | 1,293 |
| Time for the six prompts | 6 min 58 s | 8 min 33 s |
| List price of the six prompts | $0.39 | $0.32 |
Gemini 3.8 Flash was cheaper: $0.063 less at list price, and less on 4 of the 6 prompts. GPT-6.1 Terra Pro was faster: 1 min 34 s less in total, and faster on 5 of the 6 prompts.
In the recording, both Breakout games play.





