Harbor

RSIBench-Data: Benchmark for LLM Agents as Data-Centric Researchers in Recursive Self-Improvement

RSIBench-Data is a new benchmark that isolates the data-centric research capabilities of LLM agents within a fixed post-training stack, testing whether agents can autonomously diagnose capability gaps and revise training-data strategies to improve a target model. Four frontier agents are evaluated across six benchmarks spanning software engineering, math, and scientific QA. Agents improve on their first valid attempt in 58% of settings, but 78% of runs that continue after a peak score end lower, indicating inconsistent self-improvement. The benchmark is open-sourced and provides a controlled testbed for measuring progress toward recursive self-improvement.