• 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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Claude Haiku 5.5 vs Claude Fable 5.1

6 prompts both ran·Specs and numbers·Change models

Claude Haiku 5.5 took 4 min 43 s and $0.035 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 113× as much.

Claude Haiku 5.5

Anthropic · $0.50/M out · 1,071 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

Claude Haiku 5.5's SVG for the "Pelican riding a bicycle" prompt

Claude Haiku 5.5

13 s$0.0012.7k 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 Claude Haiku 5.5's page for the "Wristwatch that shows the current time" prompt

Claude Haiku 5.5

34 s$0.0047.6k 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 Claude Haiku 5.5's page for the "Landing page for a cargo bike workshop" prompt

Claude Haiku 5.5

80 s$0.01122k 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 Claude Haiku 5.5's page for the "Playable Breakout" prompt

Claude Haiku 5.5

2 min 21 s$0.01836k 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.

Claude Haiku 5.5's SVG for the "Bookshop logo" prompt

Claude Haiku 5.5

13 s$0.0012.6k 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, and we spend our days inside vintage synthesizers. We are repair technicians first: we open the cases, replace the leaking capacitors, re-tune the oscillators that have drifted out of pitch, and bring back the filters that went silent decades ago. Our bench is crowded with service manuals, spare chips, and a soldering station that has seen more Moog panels than we can count. We started the studio because we kept meeting musicians whose favourite instruments sat unused in cupboards, not because they were broken beyond saving but because nobody nearby knew how to fix them. We still believe most of these machines can be made to sing again, and we would rather spend an afternoon finding the one bad resistor than see another good synth end up in a skip.

Claude Haiku 5.5

2 s<$0.001252 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

Claude Haiku 5.5Claude Fable 5.1
MakerAnthropicAnthropic
Made inUSUS
Released7 Oct 20261 Sep 2026
Price in, per M tokens$0.10$10.00
Price out, per M tokens$0.50$50.00
Context1,000,000 tokens1,000,000 tokens
Weightsclosedclosed
Hacker News points1,0711,630
Time for the six prompts4 min 43 s16 min 4 s
List price of the six prompts$0.035$3.97

Claude Haiku 5.5 was cheaper: $3.94 less at list price, and less on each of the 6 prompts. Claude Haiku 5.5 was faster: 11 min 21 s less in total, and faster on each of the 6 prompts.

In the recording, Claude Haiku 5.5'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%; Claude Haiku 5.5 was not in it. Tea Garden experiment: Claude Fable 5.1's game passed 5 of 5 checks; Claude Haiku 5.5 was not in it.

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