• Updated 31 Oct, 14:35 UTC
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Claude Opus 5.5 vs DeepSeek V4.1 Flash

6 prompts both ran·Specs and numbers·Change models

Claude Opus 5.5 took 11 min 46 s and $1.57 at list price, DeepSeek V4.1 Flash took 9 min 16 s and $0.063 at list price. Claude Opus 5.5 took 1.3× as long and cost 25× as much.

Claude Opus 5.5

Anthropic · $20.00/M out · 2,737 HN pts

DeepSeek V4.1 Flash

DeepSeek · $0.50/M out · 1,482 HN pts

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

Pelican

Generate an SVG of a pelican riding a bicycle

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

Claude Opus 5.5

25 s$0.0462.3k tokensCLI
DeepSeek V4.1 Flash's SVG for the "Pelican riding a bicycle" prompt

DeepSeek V4.1 Flash

38 s$0.00613k 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 Opus 5.5's page for the "Wristwatch that shows the current time" prompt

Claude Opus 5.5

1 min 42 s$0.2211k tokensCLI
Still of DeepSeek V4.1 Flash's page for the "Wristwatch that shows the current time" prompt

DeepSeek V4.1 Flash

3 min 14 s$0.01427k 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 Opus 5.5's page for the "Landing page for a cargo bike workshop" prompt

Claude Opus 5.5

4 min 8 s$0.5930k tokensCLI
Still of DeepSeek V4.1 Flash's page for the "Landing page for a cargo bike workshop" prompt

DeepSeek V4.1 Flash

1 min 51 s$0.01938k 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 Opus 5.5's page for the "Playable Breakout" prompt

Claude Opus 5.5

4 min 39 s$0.6331k tokensCLI
Still of DeepSeek V4.1 Flash's page for the "Playable Breakout" prompt

DeepSeek V4.1 Flash

2 min 25 s$0.01631k tokensAPI

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

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

Claude Opus 5.5

43 s$0.0783.9k tokensCLI
DeepSeek V4.1 Flash's SVG for the "Bookshop logo" prompt

DeepSeek V4.1 Flash

61 s$0.00816k 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 narrow workshop near the Maas in Rotterdam. Every day we open up instruments that were built before most of their current owners were born. Some arrive in flight cases and some come wrapped in old bath towels. Most have a story: a Juno that went quiet halfway through a gig, a Minimoog left in someone's attic for thirty years, or a modular system that a previous technician gave up on.

We started Patchbay because we kept seeing good synthesizers sent off as "unrepairable" when all they needed was patience, a schematic and a steady hand. We swap out dried capacitors, hunt for intermittent faults, recalibrate oscillators until they track properly again, and source or rebuild parts that stopped being made decades ago.

We don't try to make old machines sound new. Our job is to make them sound like themselves again, and to make sure they keep working for the next person who plays them.

Claude Opus 5.5

9 s$0.009458 tokensCLI

Patchbay is a three-person studio in Rotterdam dedicated to the care, repair, and resurrection of vintage synthesizers. We started in a small workshop near the Maas, surrounded by oscillators, patch cables, and service manuals, because these instruments deserve more than dusty shelves and hasty fixes. Between us, we have decades of experience in electronics, sound design, and restoration, but we approach every machine with the same curiosity: listen first, trace the signal, understand the history, then bring it back to life. Whether it's a crackly filter, a dead voice card, a drifting oscillator, or a power supply that needs rebuilding, we work carefully, honestly, and with respect for original character. We also advise on maintenance, calibrate tuning and envelopes, and source hard-to-find parts when possible. At Patchbay, repair isn't just about making sound again. It's about keeping these instruments making music for decades to come.

DeepSeek V4.1 Flash

7 s<$0.001965 tokensAPI

Specs and numbers

Claude Opus 5.5DeepSeek V4.1 Flash
MakerAnthropicDeepSeek
Made inUSChina
Released22 Sep 202610 Sep 2026
Price in, per M tokens$4.00$0.045
Price out, per M tokens$20.00$0.50
Context1,000,000 tokens1,048,576 tokens
Weightsclosedopen
Hacker News points2,7371,482
Time for the six prompts11 min 46 s9 min 16 s
List price of the six prompts$1.57$0.063

DeepSeek V4.1 Flash was cheaper: $1.50 less at list price, and less on each of the 6 prompts. DeepSeek V4.1 Flash was faster: 2 min 30 s less in total, and faster on 3 of the 6 prompts.

In the recording, both Breakout games play.

Rebuild this screen experiment: Claude Opus 5.5's rebuild matched the screenshot at 89%; DeepSeek V4.1 Flash was not in it. Tea Garden experiment: Claude Opus 5.5's game passed 5 of 5 checks; DeepSeek V4.1 Flash was not in it.

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