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.
I used Claude Mythos to build my startup in 1 day launched on June 15, 2026 with 10 votes, #1,316 of 22,647 launches that month and more than 90% of that year's launches.
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
From the sources
See how your brand appears in AI answers. BrandLM.AI measures visibility across ChatGPT, Claude, Perplexity and Google AI: who
A one-time AI visibility audit that shows whether ChatGPT, Claude, Perplexity, and Google AI recommend your brand, and what to fix next. Animated demo: the question “What are the best running shoes for marathon training?” is asked on five AI platforms. In each answer, tracked brand names are highlighted as they appear and tallied below, together with the pages the AI cited. Brand names shown are fictional. Live demo with fictional brands. Your report runs on real answers. When users ask AI for the best tools, vendors, alternatives, or comparisons, they receive a concise answer naming only a handful of options. If your brand is absent or poorly positioned, you can lose consideration before a…from brandlm.ai
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