Developer Tools & APIs
gpt-5.4-cyber has been removed from the OpenAI API: what you need to do now
The gpt-5.4-cyber model ID was removed from the OpenAI API on 1 October 2026. Calls to it now return errors. Migrate to gpt-5.6-cyber.
Topic
GPT 5 4
5 posts about GPT 5 4 from Simon Carter.
Developer Tools & APIs
OpenAI is retiring gpt-5.4-cyber on 1 October 2026: here's what you need to do
gpt-5.4-cyber is deprecated with a hard removal on 1 October 2026. The replacement is gpt-5.6-cyber, but migration requires Daybreak Red approval.
Developer Tools & APIs
GPT-5.4 and GPT-5.4 mini are now retired from Codex for ChatGPT-authenticated users
From 31 August 2026, GPT-5.4 and GPT-5.4 mini no longer work in Codex under ChatGPT sign-in. Here is what to do.
Developer Tools & APIs
GPT-5.4 and GPT-5.4 mini retire from Codex on 31 August 2026 for ChatGPT users
OpenAI is retiring GPT-5.4 and GPT-5.4 mini from Codex for ChatGPT-authenticated users on 31 August 2026. Here's what to do before the deadline.
Models & Assistants
GPT-5.4 Mini and Nano: OpenAI's Fastest Small Models Are Built for the Age of AI Agents
OpenAI releases GPT-5.4 mini and nano — faster, cheaper models designed for agentic workflows, with near-flagship performance at a fraction of the cost.