o3
o3 is a deprecated reasoning model for multi-step work across text, code and images. Its model page identifies GPT-5 as its successor.
Deprecated API; check access details
A distinct reasoning generation
The default snapshot is from April 2025. Its documented window is 200,000 tokens, with up to 100,000 output tokens. It supports visual input as part of analysis, rather than producing an image directly.o3 official model documentation
Review an existing integration
Practical guidance. For a visual reasoning migration, use the same diagrams or images and require evidence from them. Compare incorrect assumptions and missing constraints. A longer explanation does not by itself establish a stronger conclusion.
Specifications & access
| Detail | Value and conditions |
|---|---|
| Status | Deprecated API; check access details |
| Access | API |
| Model identifiers | o3o3-2025-04-16 |
| Context window | 200,000 tokens Published context for this deprecated release o3 official model documentation |
| Maximum output | 100,000 tokens Published maximum output, bounded by the remaining context o3 official model documentation |
| Provider status | Deprecated in the current OpenAI model catalog; confirm remaining account access.o3 official model documentation |
Related models
A deprecated o3 model with additional computation for difficult reasoning problems.
Launch date not confirmedDeprecated API; check access detailsAPI