---
title: "OpenAI GPT-5.4-Cyber - shutdown 2026-10-01 | Harbyn"
description: "OpenAI GPT-5.4-Cyber - shutdown 2026-10-01; replacement: gpt-5.6-cyber."
canonical: "https://harbyn.com/changes/openai/2026-09-11-gpt-5-4-cyber-shutdown"
last-updated: 2026-09-21
---

# OpenAI GPT-5.4-Cyber - shutdown 2026-10-01

Markdown version of <https://harbyn.com/changes/openai/2026-09-11-gpt-5-4-cyber-shutdown>.

Retirement - OpenAI. high severity. In effect.

OpenAI deprecated gpt-5.4-cyber; removal from the API on 2026-10-01. Recommended replacement: gpt-5.6-cyber.

The deadline passed on Oct 1, 2026.

## Facts

| Fact | Value |
| --- | --- |
| Vendor | [OpenAI](https://harbyn.com/vendors/openai.md) |
| Product | models |
| Kind | Retirement |
| Severity | high |
| Status | In effect |
| Announced | Sep 11, 2026 |
| Effective | Oct 1, 2026 |
| Added to Harbyn | Sep 21, 2026 |
| Lead time | 10 days of warning |
| Model IDs | `gpt-5.4-cyber` |
| Replacement | `gpt-5.6-cyber` |
| Review | Automated, extracted by a deterministic parser |

## Find it in your code

```sh
npx harbyn scan
```

The scanner reads your repository on your machine and reports every file and line that uses the identifiers above, with the replacement. Nothing leaves your machine.

## Sources

Where this event comes from: the page we read, when we read it, and the hash of that snapshot.

- <https://platform.openai.com/docs/deprecations> (deprecations, fetched 2026-09-21 03:10 UTC, sha256 `eac49ffdf54a61294434a25dd11288b85c96cac4cc5054facb7893dec65fdae6`)

## Related changes

### More from OpenAI

- [Fixed image encoding bug affecting visual understanding](https://harbyn.com/changes/openai/2026-09-25-fixed-image-encoding-bug-affecting-visual-understanding.md) (Behavior change, announced Sep 25, 2026)
- [Transcription models - shutdown 2027-02-26](https://harbyn.com/changes/openai/2026-08-26-transcription-models-shutdown.md) (Retirement, effective Feb 26, 2027)
- [Updated chat-latest snapshot](https://harbyn.com/changes/openai/2026-10-07-updated-chat-latest-snapshot.md) (Behavior change, announced Oct 7, 2026)
- [Legacy audio, realtime, and transcription models - shutdown 2027-01-20](https://harbyn.com/changes/openai/2026-07-20-legacy-audio-realtime-and-transcription-models-shutdown.md) (Retirement, effective Jan 20, 2027)

### Changes at other vendors

- [OpenRouter: arcee-ai/trinity-large-thinking expire 2026-10-26](https://harbyn.com/changes/openrouter/2026-10-23-arcee-ai-trinity-large-thinking-expires-2026-10-26.md) (effective Oct 26, 2026)
- [Google Cloud Run and Functions: Node.js 20 runtime decommission](https://harbyn.com/changes/google-cloud/2026-10-08-node-js-20-runtime-decommission.md) (effective Oct 30, 2026)
- [Mistral AI: Z.ai GLM 5.2 (zai-glm-5-2) retires on Mistral on October 31, 2026](https://harbyn.com/changes/mistral/2026-09-29-z-ai-glm-5-2-deprecated-and-scheduled-for-retirement.md) (effective Oct 31, 2026)
- [Fireworks AI: DeepSeek V4 Flash 0731 retires from Serverless Training November 2](https://harbyn.com/changes/fireworks/2026-10-18-upcoming-serverless-training-deprecation-deepseek-v4-flash-0731.md) (effective Nov 2, 2026)

[All upcoming deadlines](https://harbyn.com/deadlines.md)