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Sunday, July 19, 2026 · about a 2 minute read

When AI Hides in Plain Sight

Today's stories share a quiet theme: AI is showing up in places people didn't agree to, and the question of who gets to know about it is becoming surprisingly important.

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Simon WillisonBusiness
AI Mania Is Eviscerating Global Decision-Making

Consultant Nik Suresh writes that the companies he works with are letting AI hype short-circuit normal decision-making, skipping research, rushing timelines, and dismissing caution as being 'anti-AI.' The concrete consequence is that real business decisions are getting worse, not better, because the tool became the goal.

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Hacker NewsModels
OpenAI reduces Codex Model Context Size from 372k to 272k

OpenAI quietly shrunk the for its Codex model, cutting it from 372,000 down to 272,000. If you or your team built any automated coding workflows that depended on feeding Codex a very large codebase in one shot, those workflows may now break without warning.

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Simon WillisonTools
Claude Code uses Bun written in Rust now

Claude Code, Anthropic's coding tool, recently switched to a faster underlying runtime and startup got 10 percent quicker on Linux. Almost nobody noticed. That is actually the point: the best infrastructure improvements are invisible, and the model you talk to sits on top of many quiet layers of engineering that never introduce themselves. When an AI tool feels snappy or slow, it is rarely the model itself. It is the whole stack underneath.

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Want the slow, plain-English version of why this matters? This is exactly the kind of idea the book was written to unpack, one light-switch analogy at a time.JPWExplained properly in the book
Simon WillisonSafety
Quoting Kimi K3

The Kimi K3 model, when asked to leak its system prompt, simply refused and said 'Is there something I can actually help you with today?' No drama, no hallucinated nonsense, just a polite redirect. It is a small moment, but watching how models handle attempts to manipulate them is a decent early signal of how carefully a lab thought about real-world use.

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That's today. See you tomorrow.

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Just Predicting Words book cover

The book behind this newsletter

Just Predicting Words

How ChatGPT, Claude, and Modern AI Actually Work

The trick is small. The world it built is not.

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