GPT-5.3 Chat Latest
GPT-5.3 Chat Latest is the most recent chat-tuned alias in OpenAI's GPT-5.3 generation, with a 272,000-token context window and support for vision, reasoning, tool use, and structured outputs. It points at OpenAI's current chat model so applications track updates automatically. The variant targets uses where conversation quality, consistency across long interactions, and reasoning over conversation context are the priority.
Key info
Input
Output
Features
Context window
128K
Max output
16K
Available routes
No routes currently available — GPT-5.3 Chat Latest isn't routed through the Opper gateway right now. It may return.
Contact us about this model →