SOSEI Joins the Anthropic Startup Program
SOSEI has been accepted into the Anthropic Startup Program. Why it matters for a product built on Claude, and what it means for our customers.

Good news: SOSEI has been accepted into the Anthropic Startup Program.
Why this matters to us
SOSEI is built on Claude, Anthropic’s AI model, from end to end. When you give us your old website, Claude reads it, plans the new structure, designs it, writes the pages, checks its own work in a real browser and fixes what it finds. The same model then handles the changes you ask for in plain words in the editor.
Being part of the program gives us more room to build, test and ship. In practice that means we can run more checks on every rebuild and try improvements faster, without passing the cost on to the businesses using SOSEI.
What it means for you
- Rebuilds that keep getting better, because every site is designed, written and reviewed by the same model, and we can afford to review more.
- Faster improvements to the editor, the AI visibility checks and the audit.
- The same price. The LAUNCH50 offer still gives our first 100 customers 50% off their first three months.
See it on your own site
The quickest way to see what Claude does with an outdated website is to try it on yours. Run the free audit: no sign-up, and we only read your public website.
Thank you to the Anthropic team for the support. More news soon.