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GPT 5.3 Family - Related AI Models | Phaseo

All model families

GPT 5.3

Models: 3
Release span: Feb 2026Mar 2026

Family members

Newest to oldest

01
GPT 5.3 Chat
OpenAI
Mar 3, 2026
deprecated
02
GPT 5.3 Codex Spark
OpenAI
Feb 12, 2026
active
03
GPT 5.3 Codex
OpenAI
Feb 5, 2026
active