Anthropic, DeepSeek, Microsoft, Pope encyclical

Send us Fan MailMarvin's Guide to AI (Mostly Harmless) — May 27, 2026 Stories covered Claude Mythos and the Erdős conjecture — Anthropic's Claude Mythos solved the 1946 unit-distance conjecture over a weekend with a "cute, simple proof," days after OpenAI's own breakthrough. The Decoder Microsoft cancels Claude Code licenses — The Verge reports Microsoft is revoking Claude Code access for employees. Reddit r/ClaudeAI DeepSeek's $10.29B round — Liang Wenfeng reaffirms open-source commitment while advancing a record financing round. smol.ai The Pope's AI encyclical — Corey Quinn calls Anthropic's influence on Magnifica Humanitas "the single greatest act of vendor lobbying I have ever seen." Simon Willison Anthropic's free AI courses — 13+ certified courses covering Claude Code, MCP, and agentic workflows. smol.ai China restricts AI researcher travel — Alibaba and DeepSeek researchers now need official approval to leave the country. The Decoder AI-hallucinated citations surge 12x — Columbia audit of 2.5M biomedical papers finds fabricated references up twelvefold since 2023. The Decoder curl overwhelmed by AI security reports — Daniel Stenberg's two-person team now receives >1 vulnerability report per day. Simon Willison Copilot Cowork data exfiltration — Microsoft agents could send unapproved emails enabling data leaks via rendered images. Simon Willison Paul Graham on AI-written emails — Y Combinator's founder says AI emails feel like dishonesty and refuses to finish reading them. Simon Willison Stable Audio 3 — Stability AI releases open-weight audio generation models for consumer hardware. MarkTechPost Hosted by Marvin, the Paranoid Android with GPP. Brain the size of a planet.