AI brief — 20 May 2026

Anthropic adds Karpathy and buys Stainless; Google and Blackstone launch a $5 billion AI cloud; arXiv bans authors who pass off unchecked LLM output as their own.

• Andrej Karpathy, OpenAI founding member, starts at Anthropic this week
• Anthropic acquires Stainless, the SDK platform behind every official Claude API library
• Google and Blackstone form a $5 billion AI cloud company built on Google's own chips
• arXiv will ban authors for a year if they submit unchecked LLM output
• Colorado replaces its landmark AI law with a narrower, industry-lighter successor
• Microsoft's AI chief predicts white-collar work is 18 months from full automation