GPT-6 Luna vs Claude Fable 5.1
GPT-6 Luna took 4 min 43 s and $0.017 at list price, Claude Fable 5.1 took 16 min 4 s and $3.97 at list price. Claude Fable 5.1 took 3.4× as long and cost 237× as much.
GPT-6 Luna
OpenAI · $0.50/M out · 24 HN pts
Claude Fable 5.1
Anthropic · $50.00/M out · 1,630 HN pts
Only Claude Fable 5.1 has CLI runs here (Claude Code).
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 repairing vintage synthesizers. We work with instruments that have been played, carried, opened up, and passed from one owner to the next. Each arrives with its own history and its own set of quirks, so we begin by listening carefully and tracing the problem before reaching for a fix.
Our work ranges from straightforward maintenance to deeper electronic repairs. We clean, test, diagnose, and restore with the aim of making a synthesizer reliable again while respecting the design that gives it its voice. When a repair calls for a replacement part, we look for a solution that fits the instrument rather than treating it as disposable.
Patchbay is run by three people who share a curiosity about how these machines work and a respect for the sounds they make. We believe a well-cared-for synthesizer has plenty more music in it, and we’re here to help it find its way back into someone’s hands.
Patchbay is three people and one workshop in Rotterdam, and we spend our days bringing old synthesizers back to life. Most of what arrives at our bench is somewhere between thirty and fifty years old: a Juno with a dead voice chip, a Minimoog that drifts out of tune the moment the room warms up, a Polysix whose battery has quietly eaten its own circuit board. We know these instruments inside and out because we have had hundreds of them open on the table.
We started Patchbay because we kept meeting musicians who had been told their synth was not worth fixing. We disagree. These machines were built to be serviced, and with the right parts, enough patience, and a good set of schematics, almost any of them can be made to play again. When we hand an instrument back, we want it to sound the way it did the day it left the factory, or better.
Specs and numbers
| GPT-6 Luna | Claude Fable 5.1 | |
|---|---|---|
| Maker | OpenAI | Anthropic |
| Made in | US | US |
| Released | 22 Sep 2026 | 1 Sep 2026 |
| Price in, per M tokens | $0.10 | $10.00 |
| Price out, per M tokens | $0.50 | $50.00 |
| Context | 1,050,000 tokens | 1,000,000 tokens |
| Weights | closed | closed |
| Hacker News points | 24 | 1,630 |
| Time for the six prompts | 4 min 43 s | 16 min 4 s |
| List price of the six prompts | $0.017 | $3.97 |
GPT-6 Luna was cheaper: $3.96 less at list price, and less on each of the 6 prompts. GPT-6 Luna was faster: 11 min 22 s less in total, and faster on 5 of the 6 prompts.
In the recording, GPT-6 Luna's Breakout game plays; Claude Fable 5.1's stopped painting.
Rebuild this screen experiment: Claude Fable 5.1's rebuild matched the screenshot at 78%; GPT-6 Luna was not in it. Tea Garden experiment: Claude Fable 5.1's game passed 5 of 5 checks; GPT-6 Luna was not in it.





