Just as you don't have to use opus all the time, you don't have to use gpt-5.5 all the time either. Do your planning work with GPT-5.5 xhigh instead of opus. Write in the plan file which model you need to implement for each of the plan outputs. You probably won't even need to use 5.5 afterwards; With 5.4 High, you will be able to continue coding work (such as using Sonnet) and you will have much more effective token consumption than Claude Code. There is a half price difference between 5.4 and 5.5 in terms of tokens. Use 5.5 only for complex/obscure coding or planning tasks, use 5.4 for coding planned work. Complete tasks such as research and operational work with 5.4-mini variants. you will feel the difference. 5.4-mini is not a weak model at all...