Monday Links: Apr. 27, 2026

Simon Willison: GPT-5.5 prompting guide (Apr. 25, 2026)
OpenAI released a GPT-5.5 prompting guide with tips to show brief user-visible updates before long tool calls, and a Codex migration command.
WSJ: Google Expands Anthropic Investment With $40 Billion Commitment (Apr. 24, 2026)
Google will invest $10 billion in Anthropic, with up to $30 billion more if milestones are met, joining Amazon, Broadcom, and others.
9to5Google: Google's rebrands ProducerAI music editor to 'Google Flow Music' (Apr. 20, 2026)
ProducerAI has been renamed Google Flow Music and gains remix features that use contextual prompts to replace, extend, and vary song sections.
WSJ: Is AI Smarter Than Humans? It’s Complicated (Apr. 24, 2026)
An experiment found large AI models outperformed solo humans, but the best results came from human-AI teams that critically challenged each other.
WSJ: OpenAI CEO Apologizes for Not Flagging Mass Shooting Suspect to Police (Apr. 24, 2026)
Sam Altman apologized to Tumbler Ridge for OpenAI not alerting police about a flagged ChatGPT account tied to accused shooter Jesse Van Rootselaar.
Clear-Eyed AI: AI safety warnings are not marketing hype (Apr. 24, 2026)
Anthropic kept Mythos off the market because it can find, exploit, and fix thousands of serious cybersecurity flaws, giving select defenders $100M in credits to address them.
WSJ: Trump White House Pressures Republican States to Kill or Neuter AI Bills (Apr. 24, 2026)
The White House has lobbied GOP-led states to abandon or delay AI bills, saying a patchwork of rules would hurt U.S. competitiveness.

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