Etched has raised $700 million at a $21 billion valuation, TechCrunch reports, in a round led by Jane Street after the quantitative trading firm tested and bought the startup’s AI hardware. Techmeme’s pickup of Robbie Whelan’s Wall Street Journal report carries the same headline figures: $700 million raised, Jane Street leading, and a $21 billion valuation. The financing marks a rapid repricing for the AI inference chip startup. According to TechCrunch, Etched was valued at $5 billion in December, then raised a $300 million Series C at a $10.3 billion valuation in July. The latest round doubles that July valuation to $21 billion in roughly a month. Jane Street’s role is notable because it is described not just as a financial backer, but as a customer. TechCrunch reports that Jane Street installed Etched’s first shipped AI cluster system, while the Wall Street Journal pickup describes Jane Street as Etched’s new server rack customer. TechCrunch also says Jane Street wrote in Etched’s round announcement that it had tested the chip, was pleased with early results, and had a rack running in its own data center. Etched delivers its hardware as full systems it calls “frontier inference clusters,” according to TechCrunch. The startup is focused on inference, the compute process that follows a user prompt and produces a model’s response. Co-founder and COO Robert Wachen told TechCrunch that Etched has designed new components for two stages of inference: prefill, where the system processes the prompt and context, and decode, where it generates output tokens. On the prefill side, TechCrunch reports that Etched built a low-voltage chip intended to fit more transistors while managing heat. On the decode side, the company says it created a new memory and interconnect approach it calls cluster-scale memory, designed to let many chips use a shared memory pool with low latency. TechCrunch characterizes Etched’s claim as higher speeds and lower costs; the provided items do not include independent benchmark results. TechCrunch also reports that Etched is trying to move beyond an early perception that its chips were designed around a single model. The company’s original intention was to etch a specific model into hardware, according to the report, but TechCrunch says Etched now says its systems can run any frontier model. Other investors named by TechCrunch include Kleiner Perkins, Sequoia Capital, Andreessen Horowitz, Peter Thiel, Tiger Global, Bain Capital Ventures, Neo, Stripes, Primary, Positive Sum, Diffusion, Argo, and Blackstone. The provided reports do not give the amount contributed by each investor, the number of systems shipped beyond Jane Street’s installation, revenue figures, or comparative performance data against incumbent AI hardware systems. Who benefits: Etched gets capital, a sharply higher valuation, and customer validation from Jane Street. Jane Street gets access to Etched’s rack-level inference system and an investor position in the supplier. Who's exposed: It is too early to identify clear losers from the provided reports. The sources do not say whether Etched has displaced another vendor or how its systems compare in independent benchmarks.