OpenAI o1
Definition
OpenAI o1 was a model series for more complex reasoning.
The series was aimed at multi-step tasks and could use additional computation before output. The API models o1 and o1-pro were shut down on October 23, 2026.
Simply explained
An earlier AI engine invested more compute effort in difficult answers.
Why it matters in practice
This entry helps to temporally classify older comparisons and technical instructions.
Example from business
Hypothetical example: A team replaces an old o1 dependency with an available, newly tested model.
Limits and pitfalls
- Historical benchmarks and API examples are not current operational guidance.
Origin & history
OpenAI introduced the o1 series in 2024; it was later replaced by newer offerings.
Use in mid-sized companies
- SMEs should review older model names in integrations and documentation.
Frequently asked questions
Is o1 still a suitable new API dependency?
No, the mentioned models are shut down.
Sources
- Deprecations, o1-Shutdown am 23.10.2026 — · OpenAI: Deprecations, o1-Shutdown am 23.10.2026 —
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