OpenAI · OpenAI (GPT / ChatGPT)
o3-pro
ActiveMaximum-reasoning o-series variant with no reasoning-time constraints ($20/$80 per 1M).
About this version
The o3‑pro model is a ChatGPT‑branded offering in the reasoning tier that entered service on 1 April 2025 and remains active. It provides an extended context window of up to 200 000 tokens and is positioned as the maximum‑reasoning variant of the O‑series, operating without reasoning‑time constraints and priced at $20/$80 per million tokens.
- API string
- o3-pro
- Context window
- 200K ctx
- Tier
- Reasoning
- Released
- Apr 1, 2025
Release & change timeline
1 event- Release
o3-pro released
Maximum-reasoning o-series variant with unconstrained reasoning time.
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