Breaking model
OpenAI will remove gpt-5.4-cyber from the API on October 1, 2026; migrate to gpt-5.6-cyber.
What changes
Announced September 11, 2026. OpenAI's deprecations page says the gpt-5.4-cyber model is deprecated and will be removed from the API on October 1, 2026, with gpt-5.6-cyber as the recommended replacement.
Breaking: Calls fail after this date.
What to do
Switch gpt-5.4-cyber to gpt-5.6-cyber before October 1, 2026, and re-run your evals on the new model.
Strings to search for
gpt-5.4-cyber