Model · Multimodal language model
GPT-5-Codex
The September 2025 GPT-5 agentic-coding release for Codex, served Responses-only as the rotating gpt-5-codex alias with no fixed dated snapshot and retired on July 23, 2026, without downloadable model weights.
- Developer
- OpenAI
- Distribution
- Developer API
- Artifact licensing
- Proprietary access
- License scope
- Reviewed release artifacts and mandatory terms; not an assessment of training code or training data openness.
- Licenses
- OpenAI Services Agreement
- Boundary
- This record represents the GPT-5-Codex line launched September 15, 2025 and served only as the rotating gpt-5-codex alias, whose underlying snapshot was regularly updated with no fixed dated revision; OpenAI shut the API down on July 23, 2026, naming gpt-5.6-sol the substitute. Codex CLI, IDE, cloud, and review application behaviors, later Codex generations, fine-tuned derivatives, and the OpenAI API platform itself are separate service, application, or model boundaries.
Risk statements
“High risk” · Precautionary
Like GPT-5, we are treating GPT-5-Codex as High risk in the Biological and Chemical domain.
- Risk areas
- Biological or chemical
- Covers
- The model itself
Read the developer's statement ↗ · 2026-10-09 · Research confidence: High
OpenAI names this release against “High risk” in biological or chemical capability, as a precaution. The statement covers the model itself. This is the developer's own statement, not an Atlas risk rating.
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