Benchmarks & Tests5 min read
AI research · Structured output benchmarks
LFM2.5-350M gained 14 points on JSON. YAML barely budged
A 100-step GRPO run lifted LFM2.5-350M from 22.6% to 29.7% on the IFStruct schema benchmark. JSON gained 14 points, YAML gained 0.3, and the dominant failure mode barely moved.
2026-09-17