April 2026 newsletter

Simon Willison's Blog News
newsletter model-updates ai-news gpt claude opus

Summary

Monthly newsletter summarizing April 2026 AI developments including Opus 4.7, GPT-5.5, Claude Mythos, and ChatGPT Images 2.0.

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# April 2026 newsletter Source: [https://simonwillison.net/2026/May/4/april-newsletter/](https://simonwillison.net/2026/May/4/april-newsletter/) 4th May 2026 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\!

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