It's kind of starting to make sense that they doubled the usage on Pro plans - if the usage drains twice as fast on 5.5 after that promo is over a lot of people on the $100 plan might have to upgrade.
Same principle applies when designing plans for complex tasks, etc. Token amount to grasp a concept is what matters.
In the same vein, I would guess that Opus 4.7 is probably cheaper for most tasks than 4.6, even though the tokenizer uses more tokens for the same length of string.
Some say it goes off on endless tangents, others that it doesn't work enough. Personally, it acts, talks, and makes mistakes like GPT models, for a much more exorbitant price. Misses out on important edge cases, doesn't get off its ass to do more than the bare minimum I asked (I mention an error and it fixes that error and doesn't even think to see if it exists elsewhere and propose fixing it there).
I've slowly been moving to GPT5.4-xhigh with some skills to make it act a bit more like Opus 4.6, in case the latter gets discontinued in favour of Opus 4.7.
YMMV, I know.
Opus 4.7 would blow through the session limits in 2-4 prompts. It was a noticeable further decrease in usage quota, which was already tight before.
Based on Anthropic‘s description 4.7 was trained to think longer.
With GPT 5.5 yesterday, I felt it completes task noticeably faster than 5.4. I kept the xhigh effort setting.