[causal]

Indeed. But if GPT-4 is actually 1.76T as rumored, an open-weight 400B is quite the achievement even if it's only just competitive.

[cjbprime]

The rumor is that it's a mixture of experts model, which can't be compared directly on parameter count like this because most weights are unused by most inference passes. (So, it's possible that 400B non-MoE is the same approximate "strength" as 1.8T MoE in general.)