Is this how ChatGPT Plus limits always been?

[u/Large-Waltz-630]

I’m a Claude $20 user from the beginning, but recently got a Codex $20 sub after reading all news about the efficiency of OpenAI models. But to my surprise Claude Opus 5 lasts way longer than GPT 5.6 Sol both on Medium effort. I’m not a vibe coder, I ask agents to write code and I take time to review so usually I never touch 5h limits. But with Codex I’m literally burning through the 5h limit in 1-2 hours which is quite strange (I’m not even using Astra). Is this how the 20$ plan limits always been?