Model · Language model
o3-mini
A smaller o-series reasoning API line, served under the OpenAI Services Agreement without downloadable model weights; OpenAI names GPT-5.6 Sol as its recommended replacement.
- 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 o3-mini release identified by the dated snapshot o3-mini-2025-01-31, announced December 2024. OpenAI announced its deprecation and documents the shutdown date of October 23, 2026 with GPT-5.6 Sol as the recommended replacement. The o3 and o3-pro siblings, the later GPT-5 family, the OpenAI platform, and ChatGPT remain separate product or service boundaries.
Risk statements
“Medium” · Threshold reached
Under the Preparedness Framework, OpenAI’s Safety Advisory Group (SAG) recommended classifying the OpenAI o3-mini (Pre-Mitigation) model as Medium risk overall. It scores Medium risk for Persuasion, CBRN (chemical, biological, radiological, nuclear), and Model Autonomy, and Low risk for Cybersecurity.
- Risk areas
- Biological or chemical · Autonomy
- Covers
- The model itself
Read the developer's statement ↗ · 2026-10-09 · Research confidence: High
OpenAI states that this release reached “Medium” in biological or chemical and autonomy capability. The statement covers the model itself. This is the developer's own statement, not an Atlas risk rating.
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