Model · Multimodal language model
o3
A deliberate 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 release identified by the dated snapshot o3-2025-04-16, announced April 2025. OpenAI announced its deprecation and documents the shutdown date of December 11, 2026 with GPT-5.6 Sol as the recommended replacement. The o3-mini and o3-pro siblings, the later GPT-5 family, the OpenAI platform, and ChatGPT remain separate product or service boundaries.
Risk statements
“High” · Below threshold
OpenAI’s Safety Advisory Group (SAG) reviewed the results of our Preparedness evaluations and determined that OpenAI o3 and o4-mini do not reach the High threshold in any of our three Tracked Categories: Biological and Chemical Capability, Cybersecurity, and AI Self-improvement.
- Risk areas
- Biological or chemical · Cyber · Autonomy
- Covers
- The model itself
Read the developer's statement ↗ · 2026-10-09 · Research confidence: Medium
OpenAI states that this release did not reach “High” in biological or chemical, cyber, 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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