Verdict: Tencent Hy3 is a 295-billion-parameter open agent model that ran completely free inside Hermes Agent (via Nous Portal) and on OpenRouter for roughly two weeks in July 2026. That promotional window has closed, but Hy3 remains a strong open-weight option for agent work, and several genuinely free agent-capable models still exist on OpenRouter today. This guide covers what Hy3 actually is, what the free period meant, what is still free, and how to plug any of them into Hermes Agent in a f...