# O3 Mini

O3 Mini is a model from OpenAI, released on 31 Jan 2025. The context window is 200,000 tokens. The maximum output is 100,000 tokens.

- Developer: OpenAI
- Id: o3-mini
- Released: 2025-01-31T00:00:00.000Z
- Sighting: 2026-10-07T16:22:11.205Z
  - [evidence link](https://github.com/truefoundry/models/blob/main/providers/microsoft-foundry/o3-mini.yaml)
- Status: Released
- Product update: 2025-01-31
  - [evidence link](https://help.openai.com/en/articles/9624314-model-release-notes)
- Canonical: https://alexgetman.com/models/openai/o3-mini/

## Questions

### What is the context window of O3 Mini?

The context window is 200,000 tokens. The maximum output is 100,000 tokens.

### When was O3 Mini released?

On 31 Jan 2025.

## Timeline

- 2026-11-11T16:59:45.497Z · [GitHub · openai/openai-python · code](https://github.com/openai/openai-python/blob/141a89aa7fbb7f13a979bda930831a5fe38bc3a4/api_reference/openapi.transformed.yml)
>                    "name": "Push Notification Summary Grader",
>                       "id": "Push Notification Summary Grader-9b876f24-4762-4be9-aff4-db7a9b31c673",
>                       "type": "label_model",
>                       "model": "o3-mini",
>                       "input": [
>                         {
>                           "type": "message",
>                           "role": "developer",
>                           "content": {
>                             "type": "input_text",
>                             "text": "\nLabel the following push notification summary as either correct or incorrect.\nThe push notification and the summary will be provided below.\nA good push notificiation summary is concise and snappy.\nIf it is good, then label it as correct, if not, then incorrect.\n"
>                           }
>                         },
>                         {
>          
This code reference does not establish a working model identifier.
**Confirmed use**
- 2026-11-14T01:20:31.106Z · [OpenAI · official articles · Introducing GPT-5 for developers](https://openai.com/index/introducing-gpt-5-for-developers)

## Evidence links

- 2026-11-05T00:01:53.188Z: Source entry removed · OpenAI API · `o3-mini`

## Evidence links

- [OpenAI API](https://api.openai.com/v1/models)
- [Artificial Analysis · benchmarks](https://artificialanalysis.ai/models)
- [review](https://developers.openai.com/api/docs/models/o3-mini)
- [OpenAI · pricing](https://developers.openai.com/api/docs/pricing)
- [GitHub · openai/openai-python · code](https://github.com/openai/openai-python/blob/141a89aa7fbb7f13a979bda930831a5fe38bc3a4/api_reference/openapi.transformed.yml)
- [truefoundry-azure](https://github.com/truefoundry/models/blob/main/providers/microsoft-foundry/o3-mini.yaml)
- [openai-model-release-notes](https://help.openai.com/en/articles/9624314-model-release-notes)
- [Azure Foundry · lifecycle](https://learn.microsoft.com/en-us/azure/foundry/concepts/model-lifecycle-retirement?view=azureml-api-2)
- [models.dev · catalogue](https://models.dev/#o3-mini)
- [models.dev · catalogue](https://models.dev/#o3-mini-high)
- [OpenAI · official articles · Introducing GPT-5 for developers](https://openai.com/index/introducing-gpt-5-for-developers)
- [OpenCode · discovery](https://opencode.ai/data/openai/o3-mini)
- [OpenRouter](https://openrouter.ai/openai/o3-mini)
- [OpenRouter](https://openrouter.ai/openai/o3-mini-high)
- [OpenAI · deprecations](https://platform.openai.com/docs/deprecations)
- [Arena · leaderboards](https://platform.openai.com/docs/guides/reasoning#reasoning-effort)

## Signals

- [O3 Mini spotted on Arena](https://alexgetman.com/signals/2026/09/11/o3-mini-high/)