OpenAI Codex (2021)
OpenAI's 2021 code-generation model - a GPT-3 fine-tune on public GitHub code that powered the original GitHub Copilot launch (distinct from the 2025 Codex CLI agent).
- Publisher
- OpenAI
- Family
- GPT
- Params
- 12B (Codex-12B), with smaller 300M and 2.5B variants reported
- Context
- 4K
- Input
- Output
- Providers
- openai
- License
- proprietary
- Released
- Jul 2021
- Canonical
- openai.com/index/openai-codex
Cite
Notes
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Context
4K
Weights
Closed
API only
Reported eval scores
0No public eval scores tracked.