# Grok 4.20 Beta Reasoning API Pricing

As of October 10, 2026, Grok 4.20 Beta Reasoning costs $1.25 per 1M input tokens and $2.50 per 1M output tokens on xAI, with cache reads at $0.20 per 1M tokens. It has a 1,000,000-token context window and returns up to 1,000,000 tokens per response.

- Page: https://models.litellm.ai/models/grok-4.20-beta-reasoning
- Lab: xAI
- LiteLLM model name: `xai/grok-4.20-beta-reasoning`
- Context window: 1,000,000 tokens
- Max output: 1,000,000 tokens
- Added to LiteLLM: September 22, 2026
- 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 |
|---|---|---|---|---|---|---|---|
| xAI | `xai/grok-4.20-beta-reasoning` | $1.25 | $2.50 | $0.20 | – | – | 1M |

## Cost examples

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

- xAI: $3.75

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

- xAI: $13.00

## Features

Supported: Function calling, Structured output, Image input, Reasoning, Prompt caching, Web search.

## Use it with LiteLLM

```python
from litellm import completion

response = completion(
    model="xai/grok-4.20-beta-reasoning",
    messages=[{"role": "user", "content": "Hello!"}],
)
```

## FAQ

### How much does Grok 4.20 Beta Reasoning cost?

Grok 4.20 Beta Reasoning costs $1.25 per 1M input tokens and $2.50 per 1M output tokens on xAI, with cache reads at $0.20 per 1M tokens. Above 200K input tokens, input costs $2.50 and output costs $5.00 per 1M tokens.

### What is the context window of Grok 4.20 Beta Reasoning?

Grok 4.20 Beta Reasoning has a 1,000,000-token context window and returns up to 1,000,000 tokens per response.

### Which providers offer Grok 4.20 Beta Reasoning?

Grok 4.20 Beta Reasoning is available from xAI through LiteLLM, using the model name xai/grok-4.20-beta-reasoning.

### How do I call Grok 4.20 Beta Reasoning with an OpenAI-compatible API?

Use the LiteLLM Python SDK with model="xai/grok-4.20-beta-reasoning", or add the model to the LiteLLM proxy's config.yaml and send requests to /v1/chat/completions from any OpenAI client. LiteLLM tracks the cost of every request at the prices on this page.

### What features does Grok 4.20 Beta Reasoning support?

Grok 4.20 Beta Reasoning supports function calling, structured output, image input, reasoning, prompt caching and web search.

### When did LiteLLM add Grok 4.20 Beta Reasoning?

Grok 4.20 Beta Reasoning was added to LiteLLM's model price file on September 22, 2026.

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