Prime Intellect · LLM RL environments

verifiers

verifiers is a library from Prime Intellect for creating environments to train and evaluate large language models. The repository describes it as a library for RL environments and evals. It was originally created by Will Brown. It is integrated with Prime Intellect's Environments Hub, its prime-rl training framework and its Hosted Training platform, and is used through the Prime CLI. The README gives no benchmark results and little detail on how it works beyond pointing to the docs, with separate AGENTS.md and skills files for coding agents. It is released under the MIT licence and has 4,761 GitHub stars. The latest release is v0.4.0 (12 October 2026), and the most recent push was on 1 November 2026.