March 2026 sponsors-only newsletter

Simon Willison's Blog / 4/2/2026

💬 OpinionDeveloper Stack & InfrastructureSignals & Early TrendsTools & Practical Usage

Key Points

  • Simon Willison has sent the March 2026 edition of his sponsors-only monthly newsletter, which sponsors (or new sponsors) can access via a private GitHub link.
  • The newsletter highlights several AI/software topics, including agentic engineering patterns, streaming experts with Mixture-of-Experts (MoE) models on a Mac, and notable model releases from March.
  • It also covers security issues such as supply chain attacks targeting PyPI and NPM, alongside non-AI updates like “Vibe porting” and what he shipped.
  • Readers are directed to a public preview of the February newsletter via a Gist and are asked to sponsor for $10/month to get early access to future editions.
Sponsored by: WorkOS — Ready to sell to Enterprise clients? Build and ship securely with WorkOS.

2nd April 2026

I just sent the March edition of my sponsors-only monthly newsletter. If you are a sponsor (or if you start a sponsorship now) you can access it here. In this month's newsletter:

  • More agentic engineering patterns
  • Streaming experts with MoE models on a Mac
  • Model releases in March
  • Vibe porting
  • Supply chain attacks against PyPI and NPM
  • Stuff I shipped
  • What I'm using, March 2026 edition
  • And a couple of museums

Here's a copy of the February newsletter as a preview of what you'll get. Pay $10/month to stay a month ahead of the free copy!

Posted 2nd April 2026 at 5:15 am

This is a note by Simon Willison, posted on 2nd April 2026.

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