GPT-5.3 series

Name: GPT-5.3 series
Author: Azure AI Foundry

gpt-5.3-codex

Capabilities

Show unsupported (7)

Infrastructure

Streaming

Model IDgpt-5.3

CreatorOpenAI

License—

Status—

Typechat

Input modalitiestext

Output modalitiestext

Open weight—

Parameters—

Architecture—

Context window—

Max input—

Max output—

Reasoning tokens—

Knowledge cutoff—

Release date—

Sourceofficial

Model	Caps	Perf	Speed	Context	Max out
gpt-5.3-chat	TJJMS	—	—	128K	16K
gpt-5.3-codex	RTJJMS	—	—	400K	128K
GPT-5.3 series	S	—	—	—	—

GET/v1/models/azure/gpt-5.3

gpt-5.3

gpt-5.3-codex

Changes · 6 entries

gpt-5.3updateca7a400Nov 2, 2026, 03:02 AM

descriptiongpt-5.3-chat , gpt-5.3-codex→gpt-5.3-codex

gpt-5.3update17bcfbfSep 11, 2026, 06:36 AM

descriptiongpt-5.3-chat , gpt-5.3-codex→gpt-5.3-codex

gpt-5.3updatec8065d6Apr 25, 2026, 10:39 AM

descriptionNEW gpt-5.3-chat , gpt-5.3-codex→gpt-5.3-chat , gpt-5.3-codex

gpt-5.3update6231fb5Apr 22, 2026, 02:50 AM

descriptionNEW gpt-5.3-codex→NEW gpt-5.3-chat , gpt-5.3-codex

gpt-5.3update2b100acMar 23, 2026, 05:30 AM

model_typechat

descriptionNEW gpt-5.3-codex

taglineNEW gpt-5.3-codex

gpt-5.3create7f5c66fMar 21, 2026, 05:16 AM