The reason Anthropic is so powerful right now is definitely because a huge number of people flocked to OpenAI and overwhelmed their capacity; in a week or so, the situation will likely flip, and Anthropic's model will likely be downgraded 🙃
Even for PLUS subscribers, standard usage is now excessive; just looking at the resources consumed by the Codex system, it easily eats up 15% of the 5-hour quota.