reasoning
o3
OpenAI o-series reasoning model for math, science, coding and visual reasoning, succeeded by GPT-5. The o3-2025-04-16 snapshot is deprecated with API removal set for 11 December 2026.
Levelmodel
Classreasoning
Parametersnot in the notes
Context200,000
Released16 Apr 2025
Opennessproprietary
Runs onnot in the notes
Statusdeprecated
R&D Topics
Identity
Where this comes from
Developer and dates from the research notes. Release date is the vendor's public announcement; weights date is when open weights were published.
Architecture and Size
- Architecture
- not in the notes
- Total parameters
- – sources
- Active parameters
- –
- Checkpoint parameters
- –
- Context length
- 200,000 tokens
- Input
- text, image
- Output
- text
Where this comes from
Parameter counts as the developer states them. Where the checkpoint holds a different total, both are shown (register A16).
Openness and Access
- Openness
- proprietary
- Licence
- Proprietary sources
- Access routes
- API
Where this comes from
The licence file governs over registry tags and aggregator labels.
Deployment
- Runs on
- not in the notes
- Footprint
- 100,000 max output tokens; knowledge cutoff Jun 01, 2024; snapshot o3-2025-04-16
- Runtimes
- not in the notes
Where this comes from
Deployment tiers and runtimes as named in the notes. Footprint is the notes' figure, not a measurement by AURION.
Indonesia
- Indonesian support
- not stated
- Regional languages
- not in the notes
- Jakarta hosting
- unknown
- Languages
- not in the notes
Where this comes from
Indonesia fields are carried on every model; unknown is an allowed value.
Benchmark Results
The notes record no benchmark result for this model.
Lineage
The notes record no lineage for this model.
Industry Use Cases
No industry use case links this model.
Links
DeveloperOpenAIfrontier lab, USA
OpenAIfrontier lab, USAModelo3OpenAI, reasoning
o3OpenAI, reasoningR&D TopicsReasoning via Large-Scale RL
Use CasesChinese Medical LLMsHealthcareUse cases of models in the same R&D topic; none is recorded for this model itself.
Who Runs Itnone recordedDeployments of these use cases; none names this model.
Models 1
Organisations 1
Sources
- developers.openai.com/api/docs/models/o3.md https://developers.openai.com/api/docs/models/o3.md
- developers.openai.com/api/docs/changelog.md https://developers.openai.com/api/docs/changelog.md
- developers.openai.com/api/docs/deprecations.md https://developers.openai.com/api/docs/deprecations.md
To cite this page: Project AURION, AI Use-Cases Research & Innovation, "o3", https://aurion.semai.id/models/openai-o3/, records of October 2026.