A newly posted survey on Hugging Face, titled The Last AI Built by Humans: Toward Genuine Recursive Self-Improvement, lays out a roadmap for recursive self-improvement (RSI) in artificial intelligence, spanning scientific discovery, embodied intelligence, and software engineering.
The authors define RSI as an intelligent system's ability to turn acquired experience and feedback into persistent changes across interaction rounds, such that those changes influence how later improvements are generated, evaluated, selected, and consolidated. The object of change may be model weights, prompts, code, memory, skills, task distributions, or the improvement mechanism itself.
To diagnose the limits of current systems, the paper introduces the Headroom-Closed Index (HCI), which the authors use to surface problems in existing large language models before presenting the RSI concept and its development roadmap.
That roadmap is formalized as an L1–L5 taxonomy: L1 covers autonomy over improvement execution; L2 covers autonomy over improvement strategies; L3 covers autonomy over future learning experience; L4 covers autonomy in deployment and environmental adaptation; and L5 describes the shift from environmental adaptation to meta-improvement, where the system improves the mechanism that produces future improvements, such as search, evaluation, or research-control policies.
The authors stress that the levels capture autonomy over what is changed, how it is changed, and where later learning experience comes from — not paper-quality rankings. The taxonomy deliberately includes bounded forms and precursors, so inclusion does not imply that every entry is a fully autonomous or open-ended RSI system; the L1 and L2 labels make bounded autonomy explicit.
The work also connects RSI research with practical systems, drawing on diverse industry practices and preliminary empirical evidence, and identifies key challenges to achieving genuine RSI. A companion repository provides a paper-level, auditable version of the roadmap, retaining 491 baseline papers and 28 table-derived extensions under the L1–L5 taxonomy.