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Proximal

Long-horizon coding RL environments built from real codebases

Proximal builds long-horizon software engineering environments from real codebases for RL training of coding agents at frontier labs. It publishes the FrontierSWE benchmark.

FrontierSWE benchmark

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Websiteproximal.ai
DomainsCoding, Long Horizon
LocationSan Francisco, Bangalore
Team size26-50
FoundersJustus Mattern, Navid Pour, Calvin Chen

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Products and services supported by official company materials. Reviewed 2026-08-16.

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Data servicecompany reported

Coding Data Engine

Training data for autonomous coding agents.

Commercial
Official website

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