Hugging Face has launched Harness-1, a 20 billion parameter search agent designed with a state-externalizing harness. This new agent offers frontier-level long-horizon search capabilities, competing with Opus-4.6 and surpassing GPT-5.4 in performance. It operates with Context-1-level cost and latency, and features the ability to externalize candidates, evidence, verification, and search history. Harness-1 is available as an open-source solution.
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Hugging Face Unveils Harness-1: A 20B Search Agent Surpassing GPT-5.4
Hugging Face· Hugging Face· Monday, June 8, 2026
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