# o1 Preview

**Current Snapshot:** o1-preview-2024-09-12

Research preview of the o1 series of models, trained with reinforcement learning
to perform complex reasoning. o1 models think before they answer, producing a
long internal chain of thought before responding to the user.

## Snapshots

### o1-preview-2024-09-12

- Context window size: 128000
- Knowledge cutoff date: 2023-10-01
- Maximum output tokens: 32768
- Supported features: streaming, structured_outputs, file_search,
  function_calling, file_uploads

## Supported Tools

## Rate Limits

### o1-preview

| Tier   | RPM   | TPM      | Batch Queue Limit |
| ------ | ----- | -------- | ----------------- |
| tier_1 | 500   | 30000    |                   |
| tier_2 | 5000  | 450000   |                   |
| tier_3 | 5000  | 800000   | 50000000          |
| tier_4 | 10000 | 2000000  | 200000000         |
| tier_5 | 10000 | 30000000 | 5000000000        |