Simon Willison's Newsletter newsletter by Simon Willison: latest issues, cadence and price
by Simon Willison · Substack · Free · weekly · last issue Sep 21, 2026 · Active
Issues
20 on file since May 8, 202620 of 20 issues
About this newsletter
LLMs, tools and prompt injection, gathered from his weblog.
Free or paid
Free on Substack. 0% of its latest 12 issues are for paying subscribers (from its public archive, checked weekly).
Issues per week, last 26 weeks
Issues by month
Writes about
AI and agents (18), AI research (1), Software engineering (1) in the last six months.
Simon Willison
Also from Simon Willison: Latent Space, Lenny's Newsletter, Stratechery, TheSequence, Exponential View, Refactoring, The Pragmatic Engineer, Platformer, The Algorithmic Bridge, Data Engineering Weekly, Interconnects, Understanding AI, Big Technology, ChinAI, benn.substack, Import AI, Hacker Newsletter, Last Week in AI, The Chip Letter, SeattleDataGuy, One Useful Thing, Ahead of AI, AI as Normal Technology, Fabricated Knowledge
History
Listed on Newsletters Sep 24, 2026. No changes to its feed, price, platform, status or cadence since.
Sources: each newsletter's own public feed or archive, read weekly. Every issue belongs to its author and links to the original; people are shown by initials, never a photo. Logos via logo.dev; trademarks belong to their owners.