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Tom Krcha

@tomkrcha • 24,540 subscribers

founder @pendev 🖋️ a16z @speedrun alumni

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I had an early access to GPT-6 Astra and I can say, everyone in the world now has a 3D designer at their fingertips. I gave it an image of a house and asked to create it in 3D with all the details including toys, appliances and furniture. This a full 3D model reconstruction in Blender with geometry that you can manually tweak and run 60fps as a locally rendered "game" on device.

I had an early access to GPT-6 Astra and I can say, everyone in the world now has a 3D designer at their fingertips. I gave it an image of a house and asked to create it in 3D with all the details including toys, appliances and furniture. This a full 3D model reconstruction in Blender with geometry that you can manually tweak and run 60fps as a locally rendered "game" on device.

1,427,500 views

Astra, separate the model to parts...

Astra, separate the model to parts...

67,968 views

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So how good really is GPT-6 Astra at 3D modeling? I took an old drawing of a steam train, gave it to Astra to reconstruct it in Blender. After few minutes it crafted 3,295 fully editable detailed objects with beautiful geometry. You can obviously tell it how detailed or simplified you want it. Go build your own transport tycoon 😎
0:34
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So how good really is GPT-6 Astra at 3D modeling? I took an old drawing of a steam train, gave it to Astra to reconstruct it in Blender. After few minutes it crafted 3,295 fully editable detailed objects with beautiful geometry. You can obviously tell it how detailed or simplified you want it. Go build your own transport tycoon 😎

Tom Krcha

2,035,404 views • 6 days ago

I had an early access to GPT-6 Astra and I can say, everyone in the world now has a 3D designer at their fingertips. I gave it an image of a house and asked to create it in 3D with all the details including toys, appliances and furniture. This a full 3D model reconstruction in Blender with geometry that you can manually tweak and run 60fps as a locally rendered "game" on device.
0:20
tomkrcha's profile picture

I had an early access to GPT-6 Astra and I can say, everyone in the world now has a 3D designer at their fingertips. I gave it an image of a house and asked to create it in 3D with all the details including toys, appliances and furniture. This a full 3D model reconstruction in Blender with geometry that you can manually tweak and run 60fps as a locally rendered "game" on device.

Tom Krcha

1,427,500 views • 7 days ago

GPT-6 Astra + Three.js is insane. We are way beyond static models. We are engineering living worlds in code now. There are no "3D model files" in this demo. Both trains are generated at runtime from Typescript/Three.js code using dimensions, profiles, and geometry functions. Wheel motion and explode/reassemble animations are also entirely code-driven. Runs super smooth inside the browser.
0:22
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GPT-6 Astra + Three.js is insane. We are way beyond static models. We are engineering living worlds in code now. There are no "3D model files" in this demo. Both trains are generated at runtime from Typescript/Three.js code using dimensions, profiles, and geometry functions. Wheel motion and explode/reassemble animations are also entirely code-driven. Runs super smooth inside the browser.

Tom Krcha

668,334 views • 5 days ago

So which model is the best at frontend design? You can now eval pretty much all of them in pen(dot)dev in realtime in parallel. It's the most versatile design agent, where you can Sign in with ChatGPT, use your Claude subscription, OpenCode Go, Github CoPilot, connect Cursor Composer 2.5/Grok 4.5, Minimax M3, Kimi K2.7/K3, GLM 5.2, Gemini 3.5 Flash, Qwen 3.7 Plus etc, mix and match these models on design tasks directly in your codebase locally on your desktop.
0:25
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So which model is the best at frontend design? You can now eval pretty much all of them in pen(dot)dev in realtime in parallel. It's the most versatile design agent, where you can Sign in with ChatGPT, use your Claude subscription, OpenCode Go, Github CoPilot, connect Cursor Composer 2.5/Grok 4.5, Minimax M3, Kimi K2.7/K3, GLM 5.2, Gemini 3.5 Flash, Qwen 3.7 Plus etc, mix and match these models on design tasks directly in your codebase locally on your desktop.

Tom Krcha

2,457,682 views • 1 month ago

GPT-6 Astra created a custom Lego set for me - San Francisco Golden Gate Bridge inspired by dominik kundel's one 🙌. Astra built a preview tool in Three.js for me, create a complete Lego pieces visual audit list and put all the parts in my shopping bag via Pick a Brick on Lego website 🤯 Final cost: $381.82. I love building custom Lego sets ever since I was a kid and this really brings it to another level.
0:20
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GPT-6 Astra created a custom Lego set for me - San Francisco Golden Gate Bridge inspired by dominik kundel's one 🙌. Astra built a preview tool in Three.js for me, create a complete Lego pieces visual audit list and put all the parts in my shopping bag via Pick a Brick on Lego website 🤯 Final cost: $381.82. I love building custom Lego sets ever since I was a kid and this really brings it to another level.

Tom Krcha

72,912 views • 3 days ago

Introducing AI Pen in pen.dev. Draw vectors with agents, refine béziers manually. Multipoint rotate, scale & multipath editing included. Download today at
0:40
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Introducing AI Pen in pen.dev. Draw vectors with agents, refine béziers manually. Multipoint rotate, scale & multipath editing included. Download today at

Tom Krcha

794,961 views • 1 month ago

Astra, separate the model to parts...
0:20
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Astra, separate the model to parts...

Tom Krcha

67,968 views • 6 days ago

Excited to launch Pencil INFINITE DESIGN CANVAS for Claude Code > Superfast WebGL canvas, fully editable, running parallel design agents > Runs locally with Claude Code → turn designs into code > Design files live in your git repo → Open json-based .pen format
1:19
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Excited to launch Pencil INFINITE DESIGN CANVAS for Claude Code > Superfast WebGL canvas, fully editable, running parallel design agents > Runs locally with Claude Code → turn designs into code > Design files live in your git repo → Open json-based .pen format

Tom Krcha

1,501,544 views • 7 months ago

Attention. Glass has been achieved internally! Shipping today in pen.dev. Also it's not limited to a "shader container". It works on top of anything that's below it, text, vectors, bitmaps, other shaders, etc. This shader has escaped the bounds!
0:27
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Attention. Glass has been achieved internally! Shipping today in pen.dev. Also it's not limited to a "shader container". It works on top of anything that's below it, text, vectors, bitmaps, other shaders, etc. This shader has escaped the bounds!

Tom Krcha

108,430 views • 27 days ago

Design ∞ code loop, but 10x better. Introducing the browser agent in pen.dev. Import HTML/React to fully editable canvas, make edits/variations, export back to code. Build with the browser & the canvas at the same time, the ultimate combo. Download today.
1:07
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Design ∞ code loop, but 10x better. Introducing the browser agent in pen.dev. Import HTML/React to fully editable canvas, make edits/variations, export back to code. Build with the browser & the canvas at the same time, the ultimate combo. Download today.

Tom Krcha

101,837 views • 1 month ago

Pencil just crossed 100,000 users! Today we are introducing SWARM mode. A team of AI design agents working with you in parallel. Your autonomous design agency. Download now.
0:49
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Pencil just crossed 100,000 users! Today we are introducing SWARM mode. A team of AI design agents working with you in parallel. Your autonomous design agency. Download now.

Tom Krcha

368,716 views • 6 months ago

Introducing Design Mode for Cursor! 🧑‍🎨🤖 Vibe code and vibe design in one place, stay in the flow. Uses the same existing AI agent that's in your favorite coding tool, same context, intertwined.
0:50
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Introducing Design Mode for Cursor! 🧑‍🎨🤖 Vibe code and vibe design in one place, stay in the flow. Uses the same existing AI agent that's in your favorite coding tool, same context, intertwined.

Tom Krcha

859,304 views • 1 year ago

Design Mode for Cursor Introducing a new way to design right where you code.
0:59
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Design Mode for Cursor Introducing a new way to design right where you code.

Tom Krcha

361,455 views • 11 months ago

Introducing Code on Canvas in AI design tool for Claude and Codex. Design ❤️ Code are officially in a relationship, opening new ways to create on canvas. Ask agent to generate custom design tools inside Pencil on the fly, create interactive components, generative art and more, but still keep the full manual design control. This is just the beginning. Let us know what you think. And let's take it to the next level together. Download the new Pencil update today.
0:57
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Introducing Code on Canvas in AI design tool for Claude and Codex. Design ❤️ Code are officially in a relationship, opening new ways to create on canvas. Ask agent to generate custom design tools inside Pencil on the fly, create interactive components, generative art and more, but still keep the full manual design control. This is just the beginning. Let us know what you think. And let's take it to the next level together. Download the new Pencil update today.

Tom Krcha

80,132 views • 4 months ago

Pencil just crossed 1M downloads on Cursor Extensions marketplace. With Composer 2.5, it's a killer AI design combo. Just flies. Designs a full website for desktop and mobile sub-minute. Fully editable on canvas inside Cursor. Video at 1x speed.
0:46
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Pencil just crossed 1M downloads on Cursor Extensions marketplace. With Composer 2.5, it's a killer AI design combo. Just flies. Designs a full website for desktop and mobile sub-minute. Fully editable on canvas inside Cursor. Video at 1x speed.

Tom Krcha

56,668 views • 3 months ago

btw, from Figma → Code via Pencil > just copy/paste: cmd+C in Figma, cmd+V in Pencil > styles and layout settings preserved, pixel perfect > claude code produces the code that fits your repo code, requirements and rules, you are in charge
0:34
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btw, from Figma → Code via Pencil > just copy/paste: cmd+C in Figma, cmd+V in Pencil > styles and layout settings preserved, pixel perfect > claude code produces the code that fits your repo code, requirements and rules, you are in charge

Tom Krcha

15,437 views • 7 months ago

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