Models / openai / GPT-5.3 Chat Latest

GPT-5.3 Chat Latest

JSON →
openaillm

The latest chat-optimized variant of GPT-5.3, offering improved conversational abilities over GPT-5.2.

texttool-usejson-modestreamingreasoningcode-generationfunction-callingvisionprompt-caching
homepage ↗docs ↗
Specs
Context & limits
128K
context window
16K
max output
Lifecycle
Dates
released2026-03-05
knowledge cutoff2025-12-01
Resources
homepagehttps://openai.com/gpt-5 ↗
docshttps://platform.openai.com/docs/models/gpt-5 ↗