TL;DR variable rename passes Git, greenlights your mocked test suite, and gets approved in code review—right up until it crashes every real production call the moment it executes. This failure mode isn’t an anomaly. It’s what inevitably happens when a prompt’s input variables change and zero tooling checks the actual call sites relying on them….
It covers both the regular ChatGPT interface and Codex in a single framework, reflecting how the two are converging into one product. The tone is a bit different from OpenAI’s recent developer docs for GPT-5 and GPT-5.5, which focused on API parameters, reasoning-effort levels, and elaborate prompt schemas. The end-user guide drops all of that but keeps…
I’ve worked on, conversation state tends to grow quickly over time. It’s common to resend large portions of the history on each turn—including older tool outputs, repeated RAG retrievals, and context that’s no longer relevant. As this accumulates, prompts can become significantly larger, which may increase inference cost and latency, and in some cases affect…