models · openai

GPT-5.3 Codex

GPT-5.3 Codex — specialized coding model. 209 tok/s, optimized for agentic code generation.

What this registry has checked

Quarantine. We hold the publisher’s own published hash for these weights and have recorded it against this entry. We have not downloaded and hashed the weights ourselves, so the hash is the publisher’s claim, not our measurement.

Weight file SHA-256	1636d167e0ed39c968f04ecb39ec8ee82ed3a8af6d5df0447030ba6d81985e22
Method	closed-weights

Re-check this yourself → Source → Full record →

What is recorded

Publisher	openai
Origin	United States
Licence	OpenAI-TOS
Context window	400,000 tokens
Modality	text+image+file->text
Pulls recorded here	60,856

Reported scores

GPQA Diamond	91.5
IFBench	75.4
Humanity's Last Exam	42.5

Reported by a third party and recorded here, not re-run by us. Source: artificialanalysis.ai/api/v2.

Elsewhere in the registry

All models → Browse with filters → What will run on my hardware? →

Registry record as of 2026-09-28. Identity, licence and parameter count are properties of a release and do not move; tier can, and the verify link above re-checks it against the live registry rather than this page.