GPT-5.3 Chat is an updated version of ChatGPT’s most widely used model, designed to make everyday conversations smoother, more practical, and more directly helpful. It provides more accurate answers with stronger context awareness and noticeably cuts down on unnecessary refusals, excessive caveats, and overly cautious wording that can disrupt the flow of conversation.
Retired on Aug 10, 2026: requests to this model ID now return an error. These models are live and work with the same API key.
GPT-5.3 Chat is an updated version of ChatGPT’s most widely used model, designed to make everyday conversations smoother, more practical, and more directly helpful.
No. GPT-5.3 Chat was retired on NagaAI on Aug 10, 2026, and requests to it now return an error. Live models you can use instead with the same API key: GPT-6.1 Terra, GPT-6.1 Sol and GPT-6 Luna.
It takes text, images and files as input and returns text.
