o3-pro
o3-pro is a deprecated higher-compute version of o3. It uses the Responses API and was designed for problems that can require several minutes of reasoning.
Deprecated API; check access details
A reasoning release with a smaller total context
The documented context is 200,000 tokens with up to 100,000 output tokens. The default snapshot is dated June 2025. Background processing is recommended for requests that would otherwise exceed a client timeout.o3-pro official model documentation
Review an existing integration
Practical guidance. For a long technical review, separate request transport from the saved completion state. Review the assumptions and evidence in the final result. Compare a replacement on the hard reasoning cases instead of only measuring short-answer speed.
Specifications & access
| Detail | Value and conditions |
|---|---|
| Status | Deprecated API; check access details |
| Access | API |
| Model identifiers | o3-proo3-pro-2025-06-10 |
| Context window | 200,000 tokens Published context for this deprecated release o3-pro official model documentation |
| Maximum output | 100,000 tokens Published maximum output, bounded by the remaining context o3-pro official model documentation |
| Provider status | Deprecated in the current OpenAI model catalog; confirm remaining account access.o3-pro official model documentation |