Lenny's Newsletter

Adam Mosseri: AI is a tailwind for authenticity

What a harness is and how to build one with Claude Agent SDK

How tech workers are feeling in 2026: a workforce splitting in two

🎙️ How I AI: Sonnet 5 review & How to run autonomous coding agents from your phone

How I run autonomous coding agents from my phone with OpenAI Symphony + Linear | Alessio Fanelli (Kernel Labs)

🧠 Community Wisdom: Quarterly planning and AI, cash vs. equity comp, paying for interview exercises, AI-powered outbound, compliance startup opportunities, and more

Sonnet 5 review: I ran 64 generations to find out if it's worth it

How top PMs increase their leverage with AI

🎙️ How I AI: GLM-5.2 review & How Gusto built a new product line with Claude Code

No Figma. No Jira. No docs. How Gusto built a new product line with Claude Code | Eddie Kim (CTO)

OpenAI Codex lead on the new shape of product work | Andrew Ambrosino

🧠 Community Wisdom: Beating a career slump, adding more structure to an established team, questions for new-team 1:1s, the evolving shape of the growth role, and more

GLM 5.2: why I’m replacing Opus in Claude Code with this new model

The new inner game: Your unfair advantage in the age of AI

🎙️ How I AI: How to write AI agent loops in Claude Code and Codex + How Claude Mythos found a 15-year-old bug in Mozilla Firefox

How Claude Mythos found a 15-year-old bug in Mozilla Firefox | Brian Grinstead

Building the most AI-pilled engineering team in the world | Fiona Fung (Manager of the Claude Code and Cowork Teams)

🧠 Community Wisdom: Fractional CPO compensation, free e-signature tools, why some users pay but never use your product, sharing Claude Code context across a team, and more

How to design AI agent loops: schedules, goals, and subagents in Claude Code and Codex

🎙️ How I AI: Claude Fable 5 review & How Braintrust uses AI agents, evals, and CI to ship better software