🪦 Dead

OpenAI GPT-5.4-Cyber

Model deprecation · Model Upgrade · shut down October 1, 2026

Born
Died
Lifespan
5m 20d
Cause of death
Model Upgrade
Killed by
OpenAI
Type
Model

The 'cyber-permissive' GPT-5.4 variant built for vetted security defenders — the model that could reverse-engineer binaries and anchored OpenAI's Trusted Access for Cyber program — was shut down October 1 after five and a half months, with three weeks' notice. OpenAI's replacement advice: 'the most capable cyber model available to you.'

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Questions about OpenAI GPT-5.4-Cyber

Is OpenAI GPT-5.4-Cyber dead?

Yes. OpenAI GPT-5.4-Cyber was shut down on October 1, 2026, 5m 20d after its launch on April 14, 2026. The cause of death was model upgrade; it was killed by OpenAI. Classification: model deprecation. Details and the source are above.

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