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How I built MailShield, a DMARC and e-mail security SaaS, in my spare time with Claude Code, Next.js, Coolify and self-hosted infra on my own AS.

Inside the Vending-Bench benchmark: how Claude, GPT-4o, Gemini and o3-mini melt down running a vending machine, and why LLM agents fail at long-term tasks.