May I ask where? Personal? Work? For personal, try Hermes or Openclaw (I've recently switched to the former). At work, Copilot Studio and copilot cowork agents are as far as I've gotten. Intend to get deeper at work, but IT security policies limit some options. Curious what others are doing.
NVIDIA Nemotron 3 Ultra: The 550B Open-Weight Model Built for Agents, Not Benchmarks