"It shifts us from a “per-seat” license to “usage-based” pricing, which is a much better model for how we work. It accounts for the massive variance in developer usage (We’ve seen 1:100x differences between engineers)."

This is how we are doing it too, for the same reasons. For now, much easier to administer than trying to figure out who spends enough to get a real Claude Code seat. The other nice thing about using API keys is that you basically never hit rate limits.