GPT-5.4 Thinking System Card

GPT-5.4 Thinking is the latest reasoning model in the GPT-5 series, referred to as gpt-5.4-thinking. Its comprehensive safety mitigation approach is similar to previous models, but it is the first general-purpose model to implement specific mitigations for High capability in Cybersecurity, building upon techniques used in GPT-5.3 Codex. Readers should note that there is no GPT-5.3 Thinking model, making GPT-5.2 Thinking the primary baseline for comparison.

(Source：OpenAI)