GPT-5.4-Cyber changelog

GPT-5.4-Cyber removed from the API

The gpt-5.4-cyber model was scheduled for removal from the API on October 1, 2026, and the deprecations page now lists it under past deprecations. OpenAI recommends the most capable cyber model available to each customer.

Who is affected:

Approved security teams that called gpt-5.4-cyber.

Action needed:

Switch to the most capable cyber model available to you, such as GPT-5.6 Cyber through Daybreak Red.

GPT-5.4-Cyber to be removed October 1

gpt-5.4-cyber was deprecated with removal from the API on October 1, 2026.

Who is affected:

Approved security teams using gpt-5.4-cyber.

Action needed:

Move to the most capable cyber model available to you.