# Blacksmith raises $66M Series C at $1B valuation

Digest AI · Business & Funding · published 2026-10-21T11:30:01Z

Canonical: https://digestai.news/story/blacksmith-raises-66m-series-c-at-1b-valuation

## Summary

Blacksmith, a startup providing infrastructure for automated code testing, has secured a $66 million Series C funding round led by Sequoia Capital. This investment values the company at $1 billion, doubling its valuation from $550 million just two months prior when it raised a $45 million Series B led by Peak XV Partners. The new round brings Blacksmith’s total funding to approximately $124.5 million.

The company reports significant growth, with its customer base expanding from about 5,000 to over 10,000 companies since August. Customers include Granola, Handshake, Supabase, and LangChain. Weekly validation checks have surged from 5 million at the start of the year to 90 million, while annual recurring revenue has grown 17x to reach the tens of millions. CEO Aditya Jayaprakash stated that the largest customers spend over $1 million annually.

Unlike competitors who rent cloud resources, Blacksmith purchases and maintains its own tens of thousands of servers to control performance. Jayaprakash noted that AI coding tools have shifted the bottleneck from writing code to validating it, driving demand. However, the company faces risks from compute shortages and potential competition from AI vendors like Anthropic and OpenAI, whose tools increasingly handle testing internally.

## Key points

- Blacksmith raised $66M Series C led by Sequoia Capital at a $1B valuation.
- Weekly validation checks grew from 5 million to 90 million since the start of the year.
- The company owns its own hardware rather than renting from cloud providers like AWS.

## Why it matters

As AI generates more code, the need for fast, reliable testing infrastructure grows. Blacksmith's growth highlights a critical bottleneck in the AI development cycle and the shift toward specialized hardware for CI workloads.

## Sources

1. [AI code-testing startup Blacksmith raised a $66M Series C led by Sequoia Capital at a $1B valuation, up from $550M after raising a $45M Series B in August](https://fortune.com/2026/10/21/exclusive-ai-code-testing-startup-blacksmith-hits-1-billion-valuation-as-ai-written-code-surges) (fortune.com, 2026-10-21)

## Cite

Digest AI, "Blacksmith raises $66M Series C at $1B valuation", 21 October 2026, https://digestai.news/story/blacksmith-raises-66m-series-c-at-1b-valuation

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