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GLM 5.3 Prime vs Claude Fable 5.1

6 prompts both ran·Specs and numbers·Change models

GLM 5.3 Prime took 55 min 49 s and $3.43 at list price, Claude Fable 5.1 took 16 min 4 s and $3.97 at list price. GLM 5.3 Prime took 3.5× as long, and Claude Fable 5.1 cost 1.2× as much.

GLM 5.3 Prime

Z.ai · $8.80/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

GLM 5.3 Prime's SVG for the "Pelican riding a bicycle" prompt

GLM 5.3 Prime

6 min 15 s$0.4956k 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 GLM 5.3 Prime's page for the "Wristwatch that shows the current time" prompt

GLM 5.3 Prime

14 min 23 s$0.6776k 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 GLM 5.3 Prime's page for the "Landing page for a cargo bike workshop" prompt

GLM 5.3 Prime

15 min 37 s$1.15131k 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 GLM 5.3 Prime's page for the "Playable Breakout" prompt

GLM 5.3 Prime

12 min 56 s$0.6270k 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.

GLM 5.3 Prime's SVG for the "Bookshop logo" prompt

GLM 5.3 Prime

6 min 18 s$0.4854k 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.

Some of the machines we work on were built before any of us were born. Patchbay is a three-person repair studio in Rotterdam, and what we do is simple to describe: we keep vintage synthesizers playing. A Minimoog that sat in an attic for thirty years. A Juno-60 with keys that no longer speak. A modular system that hums where it should roar. Whatever comes through our door gets opened up, traced through, and brought back.

That means rebuilding power supplies, cleaning a thousand key contacts, chasing a fault across three boards until it turns out to be a single cracked solder joint. It means calibrating oscillators that have drifted for decades, and listening — really listening — until a filter sounds the way it did the day it left the factory.

We do this because these instruments still sound like nothing else, and because somewhere a player is waiting to hear one come back to life.

GLM 5.3 Prime

21 s$0.0182.0k 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

GLM 5.3 PrimeClaude Fable 5.1
MakerZ.aiAnthropic
Made inChinaUS
Released23 Sep 20261 Sep 2026
Price in, per M tokens$2.80$10.00
Price out, per M tokens$8.80$50.00
Context1,000,000 tokens1,000,000 tokens
Weightsclosedclosed
Hacker News points—1,630
Time for the six prompts55 min 49 s16 min 4 s
List price of the six prompts$3.43$3.97

GLM 5.3 Prime was cheaper: $0.55 less at list price, and less on 3 of the 6 prompts. Claude Fable 5.1 was faster: 39 min 45 s less in total, and faster on each of the 6 prompts.

In the recording, GLM 5.3 Prime's Breakout game plays; Claude Fable 5.1's stopped painting. GLM 5.3 Prime's landing page was cut off at the output limit (131,072 tokens).

Rebuild this screen experiment: Claude Fable 5.1's rebuild matched the screenshot at 78%; GLM 5.3 Prime was not in it. Tea Garden experiment: Claude Fable 5.1's game passed 5 of 5 checks; GLM 5.3 Prime was not in it.

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