OpenAI's GPT-5.5 rollout landed in Codex first, putting the new model directly into developer workflows rather than treating it as another chat window upgrade.

Coding is where model improvements become measurable fastest. Better completions, fewer hallucinated APIs, and faster rewrites are not abstract -- they show up in your diff.

The hype: every frontier model launch is now also a bid to own more of your software development process.

The reality check: code is unforgiving territory. Better suggestions still need tests, review, and a human who understands what the model confidently got wrong.

* Reported facts should be source-backed. Hype commentary is editorial.