I switched to API billing on Claude Code and finally saw the real cost of my sessions. Thousands of dollars on my laptop in 14 days. Thousands more on my cloud devbox. The Max plan is a flat monthly fee. The math is absurd.

GPT 5.4 dominates every benchmark. But when I gave both models the same complex product strategy prompt, the gap between benchmark scores and real-world output was staggering. Here's what actually happened.

切到 API 计费后终于看到了 Claude Code session 的真实成本。笔记本 14 天烧了几千美元，云端 devbox 又烧了几千。Max plan 是固定月费。这笔账太离谱了。

gpt 5.4 把 benchmark 横扫了一遍。我拿同一个很乱的产品战略问题去两个模型上各跑了一次，输出的差距比分数差距大得多。