GPT 5.3 Chat is now on AI Gateway (opens in new tab)

# GPT 5\.3 Chat is now on AI Gateway **Published:** March 3, 2026 | **Authors:** Walter Korman, Rohan Taneja, Jerilyn Zheng --- GPT-5.3 Chat (GPT 5.3 Instant) is now available on AI Gateway. This update focuses on tone, relevance, and conversational flow for more accurate answers, better-contextualized web results, and fewer unnecessary refusals and caveats. It also reduces hallucination rates and produces smoother and more direct responses. To use this model, set model to `openai/gpt-5....