Claude Sonnet 5.5 vs Kimi K3
Claude Sonnet 5.5 took 3 min 49 s and $0.34 at list price, Kimi K3 took 22 min 52 s and $1.92 at list price. Kimi K3 took 6.0× as long and cost 5.6× as much.
Claude Sonnet 5.5
Anthropic · $10.00/M out · 9 HN pts
Kimi K3
Moonshot AI · $15.00/M out · 9,870 HN pts
Only Claude Sonnet 5.5 has CLI runs here (Claude Code).
Pelican
Generate an SVG of a pelican riding a bicycle
Watch
Draw a mechanical wristwatch that shows the current local time, with a sweeping seconds hand and a date window. Make it look expensive.
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.
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.
Logo
Design a logo for Night Heron, an independent bookshop that only opens after dark.
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.
Patchbay is a small workshop in Rotterdam where old synthesizers come back to life. We are three people — a former recording engineer, a self-taught circuit obsessive, and a classically trained pianist who fell in love with broken machines — and between us we have spent decades coaxing sound out of equipment the rest of the world gave up on.
We started Patchbay because we kept meeting the same problem: beloved instruments sitting silent in attics and studio corners, written off as unfixable. A Juno with a dead voice chip. A Prophet that drifts out of tune. A Moog that hums when it shouldn't. To us, none of these are lost causes. They are instruments with history in them, and they deserve careful hands, original parts where possible, and honest work.
Every synth that leaves our bench is played, tested, and listened to — because that is what it was made for.
Specs and numbers
| Claude Sonnet 5.5 | Kimi K3 | |
|---|---|---|
| Maker | Anthropic | Moonshot AI |
| Made in | US | China |
| Released | 28 Sep 2026 | 16 Jul 2026 |
| Price in, per M tokens | $2.00 | $0.192 |
| Price out, per M tokens | $10.00 | $15.00 |
| Context | 1,000,000 tokens | 1,048,576 tokens |
| Weights | closed | open |
| Hacker News points | 9 | 9,870 |
| Time for the six prompts | 3 min 49 s | 22 min 52 s |
| List price of the six prompts | $0.34 | $1.92 |
Claude Sonnet 5.5 was cheaper: $1.58 less at list price, and less on each of the 6 prompts. Claude Sonnet 5.5 was faster: 19 min 3 s less in total, and faster on 5 of the 6 prompts.
In the recording, both Breakout games play.
Rebuild this screen experiment: Claude Sonnet 5.5's rebuild matched the screenshot at 94%, Kimi K3's 68%. Tea Garden experiment: Claude Sonnet 5.5's game passed 5 of 5 checks, Kimi K3's 5 of 5.





