• Updated 1 Nov, 10:02 UTC
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  • Last 7 days: 4 new models · 81 runs7 d: 4 models · 81 runs
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GPT-6 Luna vs Claude Fable 5.1

6 prompts both ran·Specs and numbers·Change models

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

GPT-6 Luna's SVG for the "Pelican riding a bicycle" prompt

GPT-6 Luna

42 s$0.0024.1k tokensAPI
Claude Fable 5.1's SVG for the "Pelican riding a bicycle" prompt

Claude Fable 5.1

26 s$0.0971.9k tokensCLI

Watch

Draw a mechanical wristwatch that shows the current local time, with a sweeping seconds hand and a date window. Make it look expensive.

Still of GPT-6 Luna's page for the "Wristwatch that shows the current time" prompt

GPT-6 Luna

54 s$0.0035.6k tokensAPI
Still of Claude Fable 5.1's page for the "Wristwatch that shows the current time" prompt

Claude Fable 5.1

2 min 16 s$0.6012k tokensCLI

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.

Still of GPT-6 Luna's page for the "Landing page for a cargo bike workshop" prompt

GPT-6 Luna

1 min 33 s$0.00613k tokensAPI
Still of Claude Fable 5.1's page for the "Landing page for a cargo bike workshop" prompt

Claude Fable 5.1

5 min 44 s$1.4729k tokensCLI

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.

Still of GPT-6 Luna's page for the "Playable Breakout" prompt

GPT-6 Luna

59 s$0.0047.8k tokensAPI
Still of Claude Fable 5.1's page for the "Playable Breakout" prompt

Claude Fable 5.1

5 min 38 s$1.4228k tokensCLI

Design a logo for Night Heron, an independent bookshop that only opens after dark.

GPT-6 Luna's SVG for the "Bookshop logo" prompt

GPT-6 Luna

29 s$0.0012.8k tokensAPI
Claude Fable 5.1's SVG for the "Bookshop logo" prompt

Claude Fable 5.1

1 min 43 s$0.357.0k tokensCLI

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.

GPT-6 Luna

6 s<$0.001387 tokensAPI

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.

Claude Fable 5.1

17 s$0.025494 tokensCLI

Specs and numbers

GPT-6 LunaClaude Fable 5.1
MakerOpenAIAnthropic
Made inUSUS
Released22 Sep 20261 Sep 2026
Price in, per M tokens$0.10$10.00
Price out, per M tokens$0.50$50.00
Context1,050,000 tokens1,000,000 tokens
Weightsclosedclosed
Hacker News points241,630
Time for the six prompts4 min 43 s16 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.

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