What happened to gpt-5.4-cyber?

In short

Model retired on .

OpenAI deprecated the gpt-5.4-cyber model, which will be removed from the API on .

Source: OpenAI API deprecations.

What this means

On , OpenAI deprecated the gpt-5.4-cyber model, with removal from the API set for . This affects developers who use it through the API. Migrate to the most capable cyber model available to you before the shutdown date.

More changes from OpenAI