GPT‑5-Codex

Published

Sep 15, 2025

GPT‑5-Codex is an AI model developed by OpenAI (United States), first published in September 2025. It works in the language domain, on tasks such as code generation and system control.

Epoch AI has no training-compute estimate for this model.

Access: API access. Its weights are not openly released. It is built on top of GPT-5.

Full record

Organization: OpenAI
Country of organization: United States
Domain: Language
Task: Code generation, System control
Model accessibility: API access
Open weights: No
Base model: GPT-5

Benchmark results

01	WeirdML	Accuracy	0.55
02	Terminal-Bench	Accuracy mean	0.44
03	Apex Agents	Pass@1 score	0.2