GPT-5.3 Instant System Card

OpenAI Blog Models
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Summary

OpenAI releases GPT-5.3 Instant, the latest in the GPT-5 series with faster response times, improved web search contextualization, and refined conversational flow. The model uses similar safety mitigations to GPT-5.2 Instant.

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# GPT-5.3 Instant System Card Source: [https://openai.com/index/gpt-5-3-instant-system-card/](https://openai.com/index/gpt-5-3-instant-system-card/) GPT‑5\.3 Instant is the newest addition to the GPT‑5 series\. As described in our[blog⁠](https://openai.com/index/gpt-5-3-instant/), GPT‑5\.3 Instant responds faster, delivers richer and better\-contextualized answers when searching the web, and reduces unnecessary dead ends, caveats, and overly declarative phrasing that can interrupt the flow of conversation\. The comprehensive safety mitigation approach for this model is largely the same as that described for GPT‑5\.2 Instant in the[GPT‑5\.2 System Card⁠](https://openai.com/index/gpt-5-system-card-update-gpt-5-2/)\. In this card we also refer to GPT‑5\.3 Instant as gpt\-5\.3\-instant\.

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