Been dealing with this exact problem for the last few months. We tried ChatGPT Teams first but yeah, the pricing gets crazy when you have devs wanting Claude and marketing stuck on GPT-4. Plus managing who uses what becomes a nightmare. nexos looks interesting - haven't tried it yet but the multi-LLM access is what sold me on villson when we switched last month. Similar setup where everyone gets their preferred model but i can actually see usage patterns and set limits per team. The assistant sharing feature is clutch too.. our product team built these custom prompts that everyone can now use without recreating them 50 times