GPT-5.3 Chat is a conversational variant in the GPT-5.3 generation, optimized for tone, relevance, and conversational flow with reduced hallucination rates and fewer unnecessary refusals.
import { streamText } from 'ai'
const result = streamText({ model: 'openai/gpt-5.3-chat', prompt: 'Why is the sky blue?'})GPT-5.3 Chat became available on March 3, 2026 on AI Gateway as a conversational variant of the GPT-5.3 generation. The update focuses on tone, relevance, and conversational flow, producing more accurate answers, better-contextualized web results, and fewer unnecessary refusals and caveats.
The model reduces hallucination rates compared to earlier chat variants and produces smoother, more direct responses. It supports the context window of 128K tokens, function calling, and multimodal input, providing the full feature set for chat applications.
If you're building chat-based products that rely on factual accuracy and natural conversation, GPT-5.3 Chat improves on previous generations in the areas that matter most for dialogue quality.