• Updated 31 Oct, 14:35 UTC
  • Next run 1 Nov, 05:17 UTCNext 1 Nov 05:17
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Pareto 26.9 vs Claude Fable 5.1

6 prompts both ran·Specs and numbers·Change models

Pareto 26.9 took 10 min 32 s and $0.34 at list price, Claude Fable 5.1 took 16 min 4 s and $3.97 at list price. Claude Fable 5.1 took 1.5× as long and cost 12× as much.

Pareto 26.9

Unbiased · $7.50/M out

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

Pareto 26.9's SVG for the "Pelican riding a bicycle" prompt

Pareto 26.9

41 s$0.1115k 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 Pareto 26.9's page for the "Wristwatch that shows the current time" prompt

Pareto 26.9

2 min$0.0526.9k 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 Pareto 26.9's page for the "Landing page for a cargo bike workshop" prompt

Pareto 26.9

4 min 1 s$0.09012k 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 Pareto 26.9's page for the "Playable Breakout" prompt

Pareto 26.9

2 min 28 s$0.0648.4k 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.

Pareto 26.9's SVG for the "Bookshop logo" prompt

Pareto 26.9

75 s$0.0152.0k 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 small workshop in the heart of Rotterdam, where three people spend their days elbow-deep in the guts of vintage synthesizers. We fix the machines that made the sounds you grew up with—the ones that shaped entire genres and then got left in basements when the tech moved on. But we're not a museum. Our benches are covered in solder, schematics, and the occasional broken key that's been there for two weeks longer than we'd like to admit.

We started this studio because we got tired of seeing classic gear being stripped for parts, or worse, turned into Instagram decor. These instruments deserve better. They were built to make noise, and we want to keep them doing exactly that.

Between the three of us, we've fixed everything from a 1960s Buchla to a beat-up Juno that fell down a flight of stairs. If you've got a synth that's gone quiet, bring it in. We'll bring it back.

Pareto 26.9

6 s$0.006788 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

Pareto 26.9Claude Fable 5.1
MakerUnbiasedAnthropic
Made in—US
Released13 Oct 20261 Sep 2026
Price in, per M tokens$2.50$10.00
Price out, per M tokens$7.50$50.00
Context262,144 tokens1,000,000 tokens
Weightsclosedclosed
Hacker News points—1,630
Time for the six prompts10 min 32 s16 min 4 s
List price of the six prompts$0.34$3.97

Pareto 26.9 was cheaper: $3.63 less at list price, and less on 5 of the 6 prompts. Pareto 26.9 was faster: 5 min 32 s less in total, and faster on 5 of the 6 prompts.

In the recording, Pareto 26.9's Breakout game plays; Claude Fable 5.1's stopped painting. Pareto 26.9's landing page was cut off at the output limit (12,000 tokens).

Rebuild this screen experiment: Claude Fable 5.1's rebuild matched the screenshot at 78%; Pareto 26.9 was not in it. Tea Garden experiment: Claude Fable 5.1's game passed 5 of 5 checks; Pareto 26.9 was not in it.

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