GPT-5.5 in the API: I ran it against my real production cases and the numbers don't justify the upgrade yet Back in 2009, when I was 18 and managing Linux hosting for my first clients, I learned something that still saves me time: never read the changelog before reading the logs. Every time a new distro promised "better performance and greater stability," I'd wait for the next deploy, fire up the load monitor, and watch the numbers. Sometimes they confirmed the hype. Sometimes the new server was a bigger mess than the old one with better branding. Today, watching GPT-5.5 land in the API with 235 points on Hacker News and everyone running benchmarks on Wikipedia prompts, I think of those nights staring at top and netstat before believing a word anyone said. So I did what I always do: grabbed my own production prompts, ran them against GPT-4o and GPT-5.5, and measured what actually matters to me — real latency, cost per token, and output quality on my specific cases. Not OpenAI's benchmarks. Mine.…