# Grok 4.20

> Grok 4.20 is a language model from xAI, released on 31 Mar 2026. It accepts text, images and files and generates text, with a 2M-token context window and up to 1.8M output tokens per response. As of 4 Oct 2026, the lowest listed API price is $1.25 per million input tokens and $2.50 per million output tokens (OpenRouter), across 1 provider we track.

Source page: https://www.aimodel.directory/models/grok-4-20
Last verified: 4 Oct 2026

## Specifications

- **Developer:** xAI
- **Release date:** 31 Mar 2026 (source: OpenRouter, https://openrouter.ai/x-ai/grok-4.20)
- **Status:** Generally available
- **Context window:** 2M (2,000,000 tokens) (source: OpenRouter, https://openrouter.ai/x-ai/grok-4.20)
- **Max output:** 1.8M tokens (source: OpenRouter, https://openrouter.ai/x-ai/grok-4.20)
- **Knowledge cutoff:** 1 Sept 2025 (source: OpenRouter, https://openrouter.ai/x-ai/grok-4.20)
- **Input:** Text, images and files (source: OpenRouter, https://openrouter.ai/x-ai/grok-4.20)
- **Output:** Text (source: OpenRouter, https://openrouter.ai/x-ai/grok-4.20)
- **Reasoning mode:** Yes (source: OpenRouter, https://openrouter.ai/x-ai/grok-4.20)
- **Tool calling:** Yes (source: OpenRouter, https://openrouter.ai/x-ai/grok-4.20)
- **Structured output:** Yes (source: OpenRouter, https://openrouter.ai/x-ai/grok-4.20)

## API pricing (USD per 1M tokens)

| Provider | Input | Output | Cached input | Context |
|---|---|---|---|---|
| OpenRouter | $1.25 | $2.50 | $0.20 | 2M |

## FAQ

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

Grok 4.20 has a context window of 2,000,000 tokens (2M) and can generate up to 1,800,000 tokens in a single response, according to OpenRouter.

### How much does the Grok 4.20 API cost?

Grok 4.20 is listed from $1.25 per million input tokens and $2.50 per million output tokens (OpenRouter). Prices last verified 4 Oct 2026.

### When was Grok 4.20 released?

xAI released Grok 4.20 on 31 Mar 2026, according to OpenRouter.

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Data licensed CC BY 4.0. Cite as: AI Model Directory, "Grok 4.20", https://www.aimodel.directory/models/grok-4-20