• Updated 31 Oct, 14:35 UTC
  • Next run 1 Nov, 05:17 UTCNext 1 Nov 05:17
  • Last 7 days: 4 new models · 448 runs7 d: 4 models · 448 runs
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Mercury 3 vs Claude Fable 5.1

6 prompts both ran·Specs and numbers·Change models

Mercury 3 took 7 min 31 s and $0.065 at list price, Claude Fable 5.1 took 16 min 4 s and $3.97 at list price. Claude Fable 5.1 took 2.1× as long and cost 62× as much.

Mercury 3

Inception · $0.35/M out · 258 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

Mercury 3's SVG for the "Pelican riding a bicycle" prompt

Mercury 3

1 min 30 s$0.01028k 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 Mercury 3's page for the "Wristwatch that shows the current time" prompt

Mercury 3

70 s$0.01233k 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 Mercury 3's page for the "Landing page for a cargo bike workshop" prompt

Mercury 3

42 s$0.00720k 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 Mercury 3's page for the "Playable Breakout" prompt

Mercury 3

29 s$0.00719k 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.

Mercury 3's SVG for the "Bookshop logo" prompt

Mercury 3

3 min 38 s$0.02983k 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 repair studio in Rotterdam, tucked between a bike shop and a coffee roastery, where vintage synthesizers come to live another life. We are not a factory and we are not a museum; we are technicians who love the smell of warm solder and the patience that old circuits demand. Between us we have restored everything from early Moog modulars to battered Junos, and we treat each instrument as if it were the first one we ever opened. There is no assembly line here. Every capacitor is tested, every busbar tracked by hand, and every voice board is listened to twice—once on the bench, once through the speakers of the synth that will use it. Patchbay exists because these machines deserve more than a quick fix. They deserve someone who knows their quirks, their failures, and the strange, beautiful sounds that made us fall in love with them in the first place.

Mercury 3

3 s<$0.0011.2k 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

Mercury 3Claude Fable 5.1
MakerInceptionAnthropic
Made inUSUS
Released16 Oct 20261 Sep 2026
Price in, per M tokens$0.10$10.00
Price out, per M tokens$0.35$50.00
Context1,000,000 tokens1,000,000 tokens
Weightsclosedclosed
Hacker News points2581,630
Time for the six prompts7 min 31 s16 min 4 s
List price of the six prompts$0.065$3.97

Mercury 3 was cheaper: $3.91 less at list price, and less on each of the 6 prompts. Mercury 3 was faster: 8 min 34 s less in total, and faster on 4 of the 6 prompts.

In the recording, both Breakout games stopped painting.

Rebuild this screen experiment: Claude Fable 5.1's rebuild matched the screenshot at 78%; Mercury 3 was not in it. Tea Garden experiment: Claude Fable 5.1's game passed 5 of 5 checks; Mercury 3 was not in it.

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