AI brief

What changed in AI yesterday, ranked for developers who use AI tools all day. Weekdays at 9:00; Monday covers the weekend. Last 30 days.

Tue, 27 Oct 2026covers Mon 26 Oct One model, one IPO, one hostile markdown file.OpenAI shipped GPT-6.1 Terra at $1/$5 per M tokens, Anthropic filed its S-1, and a planted AGENTS.md in ~/Downloads hijacked Codex and Claude Code.