GPT-5 Codex
by OpenAI
GPT-5 Codex is a model from OpenAI, released on September 15, 2025.
GPT-5 Codex has been trained specifically for conducting code reviews and finding critical flaws. When reviewing, it navigates your codebase and analyzes code patterns to identify potential security vulnerabilities, performance issues, and bugs.
Key specs
| Provider | OpenAI |
|---|---|
| Release date | 2025-09-15 |
| License | proprietary |
| Intelligence Score | 26.6 |
| Coding index | 19.1 |
Quick answers
Is GPT-5 Codex open source?
No. GPT-5 Codex is a proprietary model from OpenAI (proprietary license).
When was GPT-5 Codex released?
OpenAI released GPT-5 Codex on September 15, 2025.
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