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OpenAI API changes
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Documentation section changed: 2026-09-11: GPT-5.4-Cyber

doc:019fb619-9a96-7dbf-bd33-e06fdf8a22fb::Deprecations/Upcoming deprecations/2026-09-11: GPT-5.4-Cyber
Product
OpenAI API
Source
HTML
Change kind
Section Removed
Detected
Last updated

Deterministic evidence

Before / after

Extracted from OpenAI's published contract. Open the source ↗

−17+11 change

1 / 1
{
null
"blocks": [
{
"content": "The gpt-5.4-cyber model is deprecated and will be removed from the API on October 1, 2026. Migrate to the most capable cyber model available to you before the shutdown date.",
"type": "paragraph"
},
{
"content": "Shutdown date\tModel / system\tRecommended replacement\nOct 1, 2026\tgpt-5.4-cyber\tThe most capable cyber model available to you.",
"type": "table"
}
],
"path": [
"Deprecations",
"Upcoming deprecations",
"2026-09-11: GPT-5.4-Cyber"
]
}

Interpreted documentation change

What the vendor announced

The evidence documents a deprecation notice for gpt-5.4-cyber with a shutdown date of 2026-10-01 and recommends migrating to the most capable cyber model available. No API endpoint change is specified beyond the general guidance to migrate to the recommended replacement.

The gpt-5.4-cyber model is deprecated and will be removed from the API on October 1, 2026. Migrate to the most capable cyber model available to you before the shutdown date. Shutdown date Model / system Recommended replacement Oct 1, 2026 gpt-5.4-cyber The most capable cyber model available to you.

Deadline Oct 1, 2026Vendor source ↗

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Multi-source correlation

Other OpenAI findings correlated with this change across sources.

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