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Claude Fable 5.1 vs Nemotron 3.5 Lightning

6 prompts both ran·Specs and numbers·Change models

Claude Fable 5.1 took 16 min 4 s and $3.97 at list price, Nemotron 3.5 Lightning took 10 min 9 s and $0.012 at list price. Claude Fable 5.1 took 1.6× as long and cost 339× as much.

Claude Fable 5.1

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

Nemotron 3.5 Lightning

NVIDIA · $0.20/M out · free route · 399 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
Nemotron 3.5 Lightning's SVG for the "Pelican riding a bicycle" prompt

Nemotron 3.5 Lightning

27 s<$0.0013.0k 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 Nemotron 3.5 Lightning's page for the "Wristwatch that shows the current time" prompt

Nemotron 3.5 Lightning

2 min 20 s$0.00314k 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 Nemotron 3.5 Lightning's page for the "Landing page for a cargo bike workshop" prompt

Nemotron 3.5 Lightning

86 s$0.0017.3k 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 Nemotron 3.5 Lightning's page for the "Playable Breakout" prompt

Nemotron 3.5 Lightning

2 min 54 s$0.00316k 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
Nemotron 3.5 Lightning's SVG for the "Bookshop logo" prompt

Nemotron 3.5 Lightning

2 min 8 s$0.00313k 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 devoted to the restoration and repair of vintage synthesizers. We believe analog gear holds a living voice, and our purpose is to safeguard that sound for musicians, collectors, and creators who value authenticity. With hands-on experience in circuitry, voltage calibration, and component preservation, we treat every console, drum machine, or modular voice with meticulous care. Rotterdam’s eclectic artistic community fuels our commitment to keeping analog heritage alive, bridging past technology with present music. Whether rescuing a neglected lab unit or reviving a cherished polysynth, we approach each instrument as a unique piece of musical history, ensuring it performs as intended for years ahead. We love helping artists reconnect with the warmth and character only vintage hardware can offer. Our workshop sits in the heart of the city, where dusty circuit boards meet fresh compositions, and every repaired synth becomes part of a new musical story.

Nemotron 3.5 Lightning

54 s<$0.0014.4k tokensAPI

Specs and numbers

Claude Fable 5.1Nemotron 3.5 Lightning
MakerAnthropicNVIDIA
Made inUSUS
Released1 Sep 202611 Aug 2026
Price in, per M tokens$10.00free route (list $0.07/M)
Price out, per M tokens$50.00free route (list $0.20/M)
Context1,000,000 tokens262,144 tokens
Weightsclosedopen
Hacker News points1,630399
Time for the six prompts16 min 4 s10 min 9 s
List price of the six prompts$3.97$0.012

Nemotron 3.5 Lightning was cheaper: $3.96 less at list price, and less on each of the 6 prompts. Nemotron 3.5 Lightning was faster: 5 min 55 s less in total, and faster on 2 of the 6 prompts.

In the recording, Claude Fable 5.1's Breakout game stopped painting; Nemotron 3.5 Lightning's plays.

Rebuild this screen experiment: Claude Fable 5.1's rebuild matched the screenshot at 78%; Nemotron 3.5 Lightning was not in it. Tea Garden experiment: Claude Fable 5.1's game passed 5 of 5 checks; Nemotron 3.5 Lightning was not in it.

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