GPT-5.5 is OpenAI's best model. But paying more for it makes no sense.

We added OpenAI’s gpt-5.5 model to our eval suite the day it launched. We ran 1,742 tests overall, which included over 45 task scenarios across using 11 real engineering skills, each run 6 times and averaged the data, which is shown in this blog. TL;DR The gpt-5.5 model has the highest raw capability of any OpenAI model we've tested. When it uses agent skills and performs the same tasks, it pretty much ties with gpt-5.4 on score but costs 63% more per run. Question Answer Best Codex model out of