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Blacksmith Raises $45M at a $550M Valuation — 10x in 11 Months — Because AI-Written Code Broke CI Economics
Blacksmith closed a $45M Series B led by Peak XV with GV and Y Combinator, lifting its valuation from $60M at its September 2025 Series A to $550M and total funding to $58.5M. Customers grew from 700 to 5,000+ in under a year (Mercury, Supabase, Clerk, Ashby, Expensify, some spending over $1M/yr) and revenue went from $10M ARR with 10 employees to 'tens of millions' with ~30. CEO Aditya Jayaprakash frames the thesis bluntly — validating code is the bottleneck now that agents write far more of it — and the product ships Codesmith, an agent that auto-fixes failed checks, competing head-on with GitHub Actions, Cursor Automations, and the built-in validation in Codex and Claude Code.
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