I used Claude Mythos to build my startup in 1 day
This sounds clickbait, but it’s true: I used Claude Mythos to build the full site in 1 day. Then Anthropic removed the model, so I had to go back to Opus.
In plain words
This is a personal account of how a developer built an entire startup website in one day using Claude Mythos, an AI model from Anthropic. When Anthropic discontinued the model, the developer had to migrate the project to Claude Opus, a different AI model. The project demonstrates rapid development capabilities enabled by advanced AI assistance, though it highlights the practical challenges of relying on specific AI tools that may change or be removed. The startup is available at brandlm.ai.
written from the facts on this page · September 2026
Does the same job
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Claude Fable 5: a Mythos-class1 modelJun 2026 · anthropic.com · ▲28Anthropic's most capable model, now available to everyone
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Hey HN. I built an AI agent harness over the past few months and I'm open sourcing it today. Some context on why. I've been building with Claude Code daily using this harness. It orchestrates multiple AI agents as a team, with a dashboard, chat, kanban board, the works. I used it to build a full SaaS product (MyUpMonitor, https://myupmonitor.com) in about 24 hours of focused coding. Then yesterday Anthropic announced Mythos and decided to keep it behind closed doors. Meanwhile I'm paying for Claude and I can't access their best model. I don't think that is nice at all... So I'm…
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