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Jane Street had long skipped full-on formal methods despite using advanced type systems, but the rise of agent-driven coding cut proof costs and widened access. They’re now forming a team to integrate formal verification into their OCaml toolchain, tweaking the language and tapping their experienced user base while collaborating with external proof ecosystems.
The author infers Fable’s core advantage comes from a separate verifier model that checks outputs and curbs errors. This verifier layer likely underpins Fable’s performance lead, measured in months, by reducing hallucinations and accelerating iteration.
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