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OpenAI releases GPT-5.3 Instant, an update to ChatGPT's most-used model that improves conversational flow, reduces unnecessary refusals, and decreases hallucinations by up to 26.8% in high-stakes domains. The update focuses on tone, relevance, and practical usability based on user feedback.
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.