Harness-1 outperforms GPT-5.4 in information recall

Harness-1, a 20-billion parameter open-source search agent built on OpenAI's gpt-oss-20B, scores 73% in relevant information recall, surpassing GPT-5.4's 70.9% on a curated dataset. The agent was developed by researchers at UIUC, UC Berkeley, and Chroma. It redefines AI retrieval performance through open-source transparency and vector database integration.