GPT-5.4 cyber retirement date: October 1, 2026
Retired on October 1, 2026; requests to gpt-5.4-cyber now fail.
- Provider
- OpenAI
- Model IDs affected
gpt-5.4-cyber- Announced
- September 11, 2026
- Shutdown date
- October 1, 2026
- Replacement
- The most capable cyber model available to you.
- Platforms
- Dates apply to the OpenAI API. Fine-tuned models follow the same shutdown schedule as their base model. If you use OpenAI models through another platform, check that platform's own retirement schedule.
- Source
- Official OpenAI deprecations page (data last changed 2026-11-02, re-checked daily)
Migrating from GPT-5.4 cyber
Not yet reviewed. We haven't written model-specific migration notes for GPT-5.4 cyber yet. Start with the provider's official guidance and the replacement's model page, and use this general checklist:
- Search your code, config and environment variables for
gpt-5.4-cyber. - Re-run your evaluation set against The most capable cyber model available to you. before switching traffic.
- Recount tokens with the new model's tokenizer and re-check
max_tokens, context fit and cost. - Check tool calling, structured output and stop sequences on your real prompts.
- Dates apply to the OpenAI API. Fine-tuned models follow the same shutdown schedule as their base model. If you use OpenAI models through another platform, check that platform's own retirement schedule.
Check your code before Oct 1
All model retirements · All OpenAI deprecations
FAQ
When was GPT-5.4 cyber retired?
GPT-5.4 cyber (gpt-5.4-cyber) was retired on the OpenAI API on October 1, 2026, according to the official OpenAI API deprecations page. Requests to it now fail.
What should I use instead of gpt-5.4-cyber?
The recommended replacement is The most capable cyber model available to you..
What happens to gpt-5.4-cyber requests after the shutdown date?
After a model is retired, API requests to it return an error. Move traffic to the replacement and test it on your own prompts before the date.
Does this date apply to Amazon Bedrock, Vertex AI or Azure?
Dates apply to the OpenAI API. Fine-tuned models follow the same shutdown schedule as their base model. If you use OpenAI models through another platform, check that platform’s own retirement schedule.