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o3
Model family: o-series
o3 — an o-series step-by-step reasoning modelA model trained to "think through" problems step by step before answering, often by producing internal reasoning that's either shown or hidden from the user. Reasoning models trade speed for accuracy on hard problems — they're slower and more expensive per answer, but markedly better at math, logic, and complex analysis. OpenAI's o1 series and Mistral's Magistral are reasoning models.; strong on hard problems, now alongside newer reasoning tiers.
Identity
- Creator
- OpenAI
- Model family
- o-series
- Release date
- 2025-04-15
Technical specs
- Parameter count
- An o-series reasoning model built to think step-by-step before answering. Bills internal reasoning tokens at output rates.
- Context window
- 200K tokens
- Modalities
- Image Input
- Text
- Primary capabilities
- Coding
- Long Context
- Math
- Reasoning
- Tool Use
- Vision
License
- License
- OpenAI API Terms of Use
- Commercial use
- Allowed
- Terms
- Modification ✗
- Redistribution ✗
- Attribution ✗
Access
- Openness
- Closed Api
- Access methods
- Api First Party
- Api Third Party
- Hosted Chat Ui
- Cost tier
- Paid Api
Sources
- llm
- closed-api
- reasoning
- multimodal
- us-based
- proprietary