OpenAI GPT-5.5 briefly appeared in developer-facing systems before a public announcement, according to the report. A report says OpenAI GPT-5.5 appeared ahead of launch.
The report says developers saw references to the model in Codex during a short exposure window before access disappeared.
That kind of leak matters because model availability often shows up in tooling and API surfaces before marketing pages are ready.
The remaining question is whether OpenAI turns the exposed model into a public rollout with pricing, benchmarks, or API documentation.