• Updated 1 Nov, 10:02 UTC
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Claude Fable 5.1 vs Hy4 Preview

6 prompts both ran·Specs and numbers·Change models

Claude Fable 5.1 took 16 min 4 s and $3.97 at list price, Hy4 Preview took 34 min 52 s and $0.32 at list price. Hy4 Preview took 2.2× as long, and Claude Fable 5.1 cost 12× as much.

Claude Fable 5.1

Anthropic · $50.00/M out · 1,630 HN pts

Hy4 Preview

Tencent · $2.50/M out · 440 HN pts

Only Claude Fable 5.1 has CLI runs here (Claude Code).

Pelican

Generate an SVG of a pelican riding a bicycle

Claude Fable 5.1's SVG for the "Pelican riding a bicycle" prompt

Claude Fable 5.1

26 s$0.0971.9k tokensCLI
Hy4 Preview's SVG for the "Pelican riding a bicycle" prompt

Hy4 Preview

4 min 30 s$0.06727k tokensAPI

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 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
Still of Hy4 Preview's page for the "Wristwatch that shows the current time" prompt

Hy4 Preview

44 s$0.0114.2k tokensAPI

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 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
Still of Hy4 Preview's page for the "Landing page for a cargo bike workshop" prompt

Hy4 Preview

7 min 45 s$0.06225k tokensAPI

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 Claude Fable 5.1's page for the "Playable Breakout" prompt

Claude Fable 5.1

5 min 38 s$1.4228k tokensCLI
Still of Hy4 Preview's page for the "Playable Breakout" prompt

Hy4 Preview

12 min 37 s$0.1145k tokensAPI

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

Claude Fable 5.1's SVG for the "Bookshop logo" prompt

Claude Fable 5.1

1 min 43 s$0.357.0k tokensCLI
Hy4 Preview's SVG for the "Bookshop logo" prompt

Hy4 Preview

7 min 58 s$0.06024k tokensAPI

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 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

Patchbay is a three-person studio in Rotterdam with a very specific obsession: bringing vintage synthesizers back to life. We are three technicians and musicians who spend our days surrounded by circuit boards, calibration tapes, and the smell of solder, coaxing sound out of machines that have been silent for years. From wobbly oscillators and dead keys to crackling faders and drifting filters, we diagnose, repair, and restore analog instruments with the patience they deserve. Our workshop is stocked with rare spare parts, original service manuals, and a deep archive of hard-won knowledge about classics from Moog, Roland, Sequential, Korg, and ARP. We love these instruments not as museum pieces, but as living tools that still have music in them. Every synthesizer that leaves our bench is tested, played, and calibrated so it feels reliable enough for the stage, the studio, or the late-night jam that inspired it in the first place.

Hy4 Preview

79 s$0.0125.0k tokensAPI

Specs and numbers

Claude Fable 5.1Hy4 Preview
MakerAnthropicTencent
Made inUSChina
Released1 Sep 202628 Aug 2026
Price in, per M tokens$10.00$0.834
Price out, per M tokens$50.00$2.50
Context1,000,000 tokens1,048,576 tokens
Weightsclosedopen
Hacker News points1,630440
Time for the six prompts16 min 4 s34 min 52 s
List price of the six prompts$3.97$0.32

Hy4 Preview was cheaper: $3.65 less at list price, and less on each of the 6 prompts. Claude Fable 5.1 was faster: 18 min 47 s less in total, and faster on 5 of the 6 prompts.

In the recording, Claude Fable 5.1's Breakout game stopped painting; Hy4 Preview's loads but doesn't start.

Rebuild this screen experiment: Claude Fable 5.1's rebuild matched the screenshot at 78%; Hy4 Preview was not in it. Tea Garden experiment: Claude Fable 5.1's game passed 5 of 5 checks; Hy4 Preview was not in it.

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