I just sent out the April edition of my sponsors-only monthly newsletter (https://github.com/sponsors/simonw/). If you are a sponsor (or if you start a sponsorship now) you can access it here (https://github.com/simonw-private/monthly/blob/main/2026-04-april.md).

In this month’s newsletter:

• Opus 4.7 and GPT-5.5, both with price increases

• Claude Mythos and LLM security research

• ChatGPT Images 2.0

• More model releases

• Other highlights from my blog

• What I’m using, April 2026 edition

Here’s a copy of the March newsletter (https://github.com/simonw/monthly-newsletter-archive/blob/main/2026-03-march.md) as a preview of what you’ll get. Pay $10/month to stay a month ahead of the free copy!

Tags: newsletter (https://simonwillison.net/tags/newsletter)