# GPT-4o Realtime Preview API Pricing

As of October 10, 2026, GPT-4o Realtime Preview costs $5.00 per 1M input tokens and $20.00 per 1M output tokens on Azure OpenAI, with cache reads at $2.50 per 1M tokens. It has a 128,000-token context window and returns up to 4,096 tokens per response.

- Page: https://models.litellm.ai/models/gpt-4o-realtime-preview
- Lab: OpenAI
- LiteLLM model name: `azure/gpt-4o-realtime-preview-2024-10-01`
- Context window: 128,000 tokens
- Max output: 4,096 tokens
- Added to LiteLLM: December 2024
- Deprecation date: March 26, 2025
- Prices updated: October 10, 2026

## Pricing by provider

Token prices in USD per 1M tokens.

| Provider | Model name | Input | Output | Cache read | Per image | Per second | Context |
|---|---|---|---|---|---|---|---|
| Azure OpenAI (snapshot 2024-10-01) | `azure/gpt-4o-realtime-preview-2024-10-01` | $5.00 | $20.00 | $2.50 | – | – | 128K |
| Azure OpenAI (snapshot 2024-12-17) | `azure/gpt-4o-realtime-preview-2024-12-17` | $5.00 | $20.00 | $2.50 | – | – | 16K |
| Azure OpenAI (eu, snapshot 2024-10-01) | `azure/eu/gpt-4o-realtime-preview-2024-10-01` | $5.50 | $22.00 | $2.75 | – | – | 128K |
| Azure OpenAI (eu, snapshot 2024-12-17) | `azure/eu/gpt-4o-realtime-preview-2024-12-17` | $5.50 | $22.00 | $2.75 | – | – | 16K |
| Azure OpenAI (us, snapshot 2024-10-01) | `azure/us/gpt-4o-realtime-preview-2024-10-01` | $5.50 | $22.00 | $2.75 | – | – | 128K |
| Azure OpenAI (us, snapshot 2024-12-17) | `azure/us/gpt-4o-realtime-preview-2024-12-17` | $5.50 | $22.00 | $2.75 | – | – | 16K |

## Cost examples

1,000 requests with 2,000 input and 500 output tokens each:

- Azure OpenAI: $20.00

100 long-document requests with 100,000 input and 2,000 output tokens each:

- Azure OpenAI: $54.00

## Features

Supported: Function calling, Parallel tool calls, Audio input, Audio output.

## Use it with LiteLLM

```python
from litellm import completion

response = completion(
    model="azure/gpt-4o-realtime-preview-2024-10-01",
    messages=[{"role": "user", "content": "Hello!"}],
)
```

## FAQ

### How much does GPT-4o Realtime Preview cost?

GPT-4o Realtime Preview costs $5.00 per 1M input tokens and $20.00 per 1M output tokens on Azure OpenAI, with cache reads at $2.50 per 1M tokens.

### What is the context window of GPT-4o Realtime Preview?

GPT-4o Realtime Preview has a 128,000-token context window and returns up to 4,096 tokens per response.

### Which providers offer GPT-4o Realtime Preview?

GPT-4o Realtime Preview is available from Azure OpenAI through LiteLLM, using the model name azure/gpt-4o-realtime-preview-2024-10-01.

### How do I call GPT-4o Realtime Preview with an OpenAI-compatible API?

Use the LiteLLM Python SDK with model="azure/gpt-4o-realtime-preview-2024-10-01", or add the model to the LiteLLM proxy's config.yaml and send requests to /v1/realtime from any OpenAI client. LiteLLM tracks the cost of every request at the prices on this page.

### What features does GPT-4o Realtime Preview support?

GPT-4o Realtime Preview supports function calling, parallel tool calls, audio input and audio output.

### When did LiteLLM add GPT-4o Realtime Preview?

GPT-4o Realtime Preview was added to LiteLLM's model price file in December 2024.

### Is GPT-4o Realtime Preview being deprecated?

Azure OpenAI deprecated azure/gpt-4o-realtime-preview-2024-10-01 on March 26, 2025.

Source: LiteLLM model price file, https://github.com/BerriAI/litellm/blob/main/model_prices_and_context_window.json