• Updated 31 Oct, 14:35 UTC
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GPT-6.1 Terra Pro vs Claude Fable 5.1

6 prompts both ran·Specs and numbers·Change models

GPT-6.1 Terra Pro took 6 min 58 s and $0.39 at list price, Claude Fable 5.1 took 16 min 4 s and $3.97 at list price. Claude Fable 5.1 took 2.3× as long and cost 10× as much.

GPT-6.1 Terra Pro

OpenAI · $5.00/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

GPT-6.1 Terra Pro's SVG for the "Pelican riding a bicycle" prompt

GPT-6.1 Terra Pro

41 s$0.0375.9k 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-6.1 Terra Pro's page for the "Wristwatch that shows the current time" prompt

GPT-6.1 Terra Pro

78 s$0.06911k 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-6.1 Terra Pro's page for the "Landing page for a cargo bike workshop" prompt

GPT-6.1 Terra Pro

2 min 27 s$0.1424k 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-6.1 Terra Pro's page for the "Playable Breakout" prompt

GPT-6.1 Terra Pro

1 min 42 s$0.09916k 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-6.1 Terra Pro's SVG for the "Bookshop logo" prompt

GPT-6.1 Terra Pro

42 s$0.0314.9k 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 dedicated to repairing vintage synthesizers. We work on the instruments that have shaped decades of music, from well-loved studio staples to curious machines that have spent years in storage.

Old synthesizers develop problems in their own ways. A key stops responding, a filter drifts, a power supply gives out. We take the time to trace the fault, understand the instrument and make a repair that respects how it was built. Wherever possible, we preserve original components; when a part needs replacing, we choose with care.

We know these instruments are more than collections of circuits. They carry sounds, habits and memories, and each one has a story before it reaches our bench. Whether you rely on yours every day or are hoping to hear it again after a long silence, our aim is to help you get back to making music.

GPT-6.1 Terra Pro

8 s$0.006827 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-6.1 Terra ProClaude Fable 5.1
MakerOpenAIAnthropic
Made inUSUS
Released26 Oct 20261 Sep 2026
Price in, per M tokens$1.00$10.00
Price out, per M tokens$5.00$50.00
Context1,050,000 tokens1,000,000 tokens
Weightsclosedclosed
Hacker News points—1,630
Time for the six prompts6 min 58 s16 min 4 s
List price of the six prompts$0.39$3.97

GPT-6.1 Terra Pro was cheaper: $3.59 less at list price, and less on each of the 6 prompts. GPT-6.1 Terra Pro was faster: 9 min 6 s less in total, and faster on 5 of the 6 prompts.

In the recording, GPT-6.1 Terra Pro'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-6.1 Terra Pro was not in it. Tea Garden experiment: Claude Fable 5.1's game passed 5 of 5 checks; GPT-6.1 Terra Pro was not in it.

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