Codex (original)

OpenAI · 2021 · Code LLM · USA

A to Z

A · App: No
B · Built By: OpenAI
C · CEO & Politics: Sam Altman — Independent; self-described 'politically homeless' (2025); former Democratic donor; $1M personal donation to Trump inaugural fund (2025)
D · Date: 2021
E · Expertise: Intermediate+
F · Free Tier: Yes
G · Generates: Text only
H · Deployment: Cloud
I · Inputs: Text
J · Jurisdiction: USA
K · Key Staffers: Greg Brockman (President), Jakub Pachocki (Chief Scientist), Brad Lightcap (COO), Fidji Simo (CEO Applications), Sarah Friar (CFO), Mark Chen (SVP Research), Denise Dresser (CRO)
L · Languages: English-primary
M · Model Type: Code LLM
N · Safety Issues: None reported
O · Open Source: Proprietary
P · Pricing: Retired (no longer sold)
Q · AIDb Rating: [UNKNOWN]
R · What Makes It Special: OpenAI's original Codex, a GPT language model fine-tuned on public GitHub code; a distinct production version powered GitHub Copilot. On OpenAI's HumanEval benchmark it solved 28.8% of problems in one attempt (GPT-3 solved 0%) and 70.2% with 100 samples per problem, and OpenAI noted weaknesses with long chains of operations and binding operations to variables.
S · Stock / Status: Private (~$852B valuation, Mar 2026)
T · Training Cutoff: [UNKNOWN]
U · Users: [UNKNOWN]
V · Voice Chat: No
W · Weights: API only
X · X Handle: @OpenAI
Y · Year Founded: [UNKNOWN]
Z · Bottom Line: Proprietary Code LLM from OpenAI, released 2021.

Data completeness 85% · Last verified 2026-05-12 · Primary source ↗

“Codex (original).” AIDb — The AI Database. Verified 2026-05-12. https://theaidatabase.com/m/codex-original.html