An executive-assistant dot, and the cost of building your own

Treb Gatte (@tgatte) posted that his OpenAI dot flagged a client’s high-priority email and summarized it before he asked. He says he has had his dot running since DevDay as his executive assistant: it keeps him updated when meetings change and helps coordinate the day, and what makes it useful is that it keeps working between conversations and brings him things before he thinks to ask. Because he builds on Microsoft’s stack for a living, he modeled a comparable assistant on Microsoft and on Anthropic’s Claude Managed Agents. He estimates three to five months to production on Anthropic and four to six on Microsoft and, for his assumed workload of six delegated tasks and 15 chat turns per workday plus 12 daily proactive sweeps, modeled monthly costs of $258 per user on Microsoft and $167 on Anthropic with model routing. He stresses these are modeled costs, not measured usage. He notes that OpenAI includes a dot with a ChatGPT Business Premium seat at $100 per user per month billed annually, or $125 monthly, and concludes that building your own makes sense for specific data controls or specialist team workflows, but that for a personal assistant he is keeping his dot. This page restates that user post. It is not an OpenAI statement and not an independently verified case study.