GPT-5.4 Thinking System Card
GPT-5.4 Thinking System Card
OpenAI's GPT-5.4 Thinking System Card states that the model adopts safety mitigations similar to the GPT-5 series and implements mitigations for high cybersecurity capability. The System Card says GPT-5.4 Thinking is the latest reasoning model in the GPT-5 series; OpenAI says it is the first general-purpose model to implement mitigations on high cybersecurity capability. Its cybersecurity approach builds on the latest methods for GPT-5.3 Codex, covering ChatGPT and the API. Since there is no model named GPT-5.3 Thinking, the card primarily uses GPT-5.2 Thinking as the baseline.
The System Card documents GPT-5.4 Thinking's high cybersecurity capability mitigations and baseline comparisons with GPT-5.2 Thinking, allowing security teams to understand its risk assessment approach.