OpenAI · reasoning LLM
OpenAI o3
OpenAI o3 is the successor to o1 in OpenAI's reasoning line. Released in April 2025, it can call tools such as web search and Python while it reasons, and it reasons over images as well as text.
Capabilities
- ▸Deeper reasoning than o1
- ▸Uses tools (search, code, images) inside its reasoning
- ▸Strong maths, science and coding
- ▸Reasons over images
Use cases
research · hard debugging · data analysis · visual reasoning
Lineage
View the full OpenAI o1 lineage →OpenAI o3 head-to-head comparisons
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Sources & verification
Information is compiled from official announcements, documentation and reputable industry coverage.
Last verified Oct 5, 2026