We're an AI research company that builds reliable, interpretable, and steerable AI systems. Our first product is Claude, an AI assistant for tasks at any scale.

Our research interests span multiple areas including natural language, human feedback, scaling laws, reinforcement learning, code generation, and interpretability.

Team

Katelyn Lesse

Head of Engineering, Platform

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Day One® is a registered trademark of W2D1 Media Pty Ltd. All rights reserved. © 2026 W2D1 Media Pty Ltd.

Day One® exists to help founders and startup operators make better business decisions more often

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Join 755 other founders & investors receiving our emails. They're cool, are you? :)

* Regrettably, mel@canva.com is not on our list… yet.

Day One® is a registered trademark of W2D1 Media Pty Ltd. All rights reserved. © 2026 W2D1 Media Pty Ltd.