Model · Multimodal language model
o1
The first 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 o1 release identified by the dated snapshot o1-2024-12-17, 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 o1-pro sibling, the later o3 and o4-mini lines, the GPT-5 family, the OpenAI platform, and ChatGPT remain separate product or service boundaries.
Risk statements
“medium” · Threshold reached
Our evaluations found that o1 can help experts with the operational planning of reproducing a known biological threat, which meets our medium risk threshold.
- Risk areas
- Biological or chemical
- 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 capability. The statement covers the model itself. This is the developer's own statement, not an Atlas risk rating.
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