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Claude Sonnet 5.5 vs GLM 5.3

6 prompts both ran·Specs and numbers·Change models

Claude Sonnet 5.5 took 3 min 49 s and $0.34 at list price, GLM 5.3 took 22 min 22 s and $0.34 at list price. GLM 5.3 took 5.9× as long, and both cost about the same.

Claude Sonnet 5.5

Anthropic · $10.00/M out · 9 HN pts

GLM 5.3

Z.ai · $1.40/M out · 3,306 HN pts

Only Claude Sonnet 5.5 has CLI runs here (Claude Code).

Pelican

Generate an SVG of a pelican riding a bicycle

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

Claude Sonnet 5.5

12 s$0.0131.3k tokensCLI
GLM 5.3's SVG for the "Pelican riding a bicycle" prompt

GLM 5.3

4 min 2 s$0.08360k 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 Sonnet 5.5's page for the "Wristwatch that shows the current time" prompt

Claude Sonnet 5.5

42 s$0.0656.5k tokensCLI
Still of GLM 5.3's page for the "Wristwatch that shows the current time" prompt

GLM 5.3

2 min 1 s$0.02921k 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 Sonnet 5.5's page for the "Landing page for a cargo bike workshop" prompt

Claude Sonnet 5.5

1 min 37 s$0.1616k tokensCLI
Still of GLM 5.3's page for the "Landing page for a cargo bike workshop" prompt

GLM 5.3

9 min$0.1391k 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 Sonnet 5.5's page for the "Playable Breakout" prompt

Claude Sonnet 5.5

53 s$0.0838.3k tokensCLI
Still of GLM 5.3's page for the "Playable Breakout" prompt

Blank first frame. Press Run.

GLM 5.3

31 s$0.0096.7k tokensAPI

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

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

Claude Sonnet 5.5

17 s$0.0202.0k tokensCLI
GLM 5.3's SVG for the "Bookshop logo" prompt

GLM 5.3

6 min 28 s$0.08460k 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 in a workshop in Rotterdam, trying to keep old synthesizers alive. We repair, restore and recalibrate the instruments that shaped electronic music: Moogs and Oberheims, Rolands and Sequential Circuits, the odd temperamental Soviet oddity that someone found in an attic.

Most of what lands on our benches has been silent for years. A crackling pot, a drifting oscillator, a power supply that gave up in 1994. Some come from working musicians who need their instrument back before the next tour. Others come from people who inherited a dusty box from a parent and want to hear what it sounds like.

We work slowly and by hand. We trace faults with a scope and a schematic, source or rebuild parts when originals are gone, and change as little as we can. Every synth leaves with a note describing exactly what we did, so the next person to open it knows where we have been.

Come by, bring your synth, and stay for coffee.

Claude Sonnet 5.5

7 s$0.005475 tokensCLI

Patchbay is a three-person workshop in Rotterdam where vintage synthesizers come back to life. Whatever lands on our bench — a battered Minimoog, a Juno with dead keys, an ARP silent since the eighties — gets the same treatment: careful diagnosis, honest advice, and repairs done right.

We started Patchbay because we believe a good synthesizer shouldn't die of old age. These machines are more than circuits and sliders — they're the sound of records you grew up with, and the reason some of us got into music in the first place. Every one we fix goes back out into the world ready to make more.

Between us we handle everything from recapping and calibration to keybed work and the hunt for parts nobody has made in decades. It's slow, meticulous work, and we like it that way. If something in your collection hums, crackles, or refuses to turn on, bring it in — we'll see what we can do.

GLM 5.3

19 s$0.0064.3k tokensAPI

Specs and numbers

Claude Sonnet 5.5GLM 5.3
MakerAnthropicZ.ai
Made inUSChina
Released28 Sep 202618 Aug 2026
Price in, per M tokens$2.00$0.07
Price out, per M tokens$10.00$1.40
Context1,000,000 tokens1,048,576 tokens
Weightsclosedopen
Hacker News points93,306
Time for the six prompts3 min 49 s22 min 22 s
List price of the six prompts$0.34$0.34

Both cost about the same at list price: $0.34 and $0.34. Claude Sonnet 5.5 was faster: 18 min 33 s less in total, and faster on 5 of the 6 prompts.

In the recording, Claude Sonnet 5.5's Breakout game plays; GLM 5.3's stopped painting. GLM 5.3's Breakout game showed a blank first frame when the still was taken.

Rebuild this screen experiment: Claude Sonnet 5.5's rebuild matched the screenshot at 94%; GLM 5.3 was not in it. Tea Garden experiment: Claude Sonnet 5.5's game passed 5 of 5 checks, GLM 5.3's 1 of 5.

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