# GPT-4o Realtime

**Current Snapshot:** gpt-4o-realtime-preview-2025-06-03

This is a preview release of the GPT-4o Realtime model, capable of responding to
audio and text inputs in realtime over WebRTC or a WebSocket interface.

## Snapshots

### gpt-4o-realtime-preview-2024-10-01

- Context window size: 16000
- Knowledge cutoff date: 2023-10-01
- Maximum output tokens: 4096
- Supported features: function_calling, prompt_caching

### gpt-4o-realtime-preview-2024-12-17

- Context window size: 16000
- Knowledge cutoff date: 2023-10-01
- Maximum output tokens: 4096
- Supported features: function_calling, prompt_caching

### gpt-4o-realtime-preview-2025-06-03

- Context window size: 32000
- Knowledge cutoff date: 2023-10-01
- Maximum output tokens: 4096
- Supported features: function_calling, prompt_caching

## Supported Tools

## Rate Limits

### gpt-4o-realtime-preview

| Tier   | RPM   | TPM      | Batch Queue Limit |
| ------ | ----- | -------- | ----------------- |
| tier_1 | 200   | 40000    |                   |
| tier_2 | 400   | 200000   |                   |
| tier_3 | 5000  | 800000   |                   |
| tier_4 | 10000 | 4000000  |                   |
| tier_5 | 20000 | 15000000 |                   |