Build cheaper, safer AI tools this month
This issue is a builder playbook, not a headline roundup. We cover how Codex pricing changes agent unit economics, why the Fable/Mythos shutdown after a US export-control directive proves fallback routing is mandatory, how Claude's enterprise push signals demand in regulated workflows, and what multi-agent safety research means for your product architecture.
What changed
Codex, browser workflows, GPT-5.5, and agentic work moved closer to daily practice.
What to try
A concrete browser-based AI-agent task you can test on your own project this week.
What to read
The technical system-card signal behind stronger planning, tool use, and verification.