GPT-5.4 Thinking System Card

OpenAI Blog Models
gpt-5 reasoning-model safety-mitigations cybersecurity openai

Summary

OpenAI releases GPT-5.4 Thinking, the latest reasoning model in the GPT-5 series with enhanced safety mitigations, notably the first general-purpose model implementing comprehensive cybersecurity safeguards.

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# GPT-5.4 Thinking System Card Source: [https://openai.com/index/gpt-5-4-thinking-system-card/](https://openai.com/index/gpt-5-4-thinking-system-card/) GPT‑5\.4 Thinking is the latest reasoning model in the GPT‑5 series, and explained in our[blog⁠](https://openai.com/index/introducing-gpt-5-4/)\. The comprehensive safety mitigation approach for this model is similar to previous models in this series, but 5\.4 Thinking is the first general purpose model to have implemented mitigations for High capability in Cybersecurity\. The approach to cyber safety builds on the latest approaches implemented for GPT‑5\.3 Codex, in ChatGPT and the API\. In this card we also refer to GPT‑5\.4 Thinking as gpt\-5\.4\-thinking\. Note that there is not a model named GPT‑5\.3 Thinking, so the main model to baseline against is GPT‑5\.2 Thinking\.

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