# Grok 4.5

> Grok 4.5 is a proprietary language model from xAI, released on 8 Jul 2026. It accepts text, images and PDFs and generates text, with a 500K-token context window and up to 500K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $2 per million input tokens and $6 per million output tokens (xAI API), across 3 providers we track.

Source page: https://www.aimodel.directory/models/grok-4-5
Last verified: 4 Oct 2026

## Specifications

- **Developer:** xAI
- **Release date:** 8 Jul 2026 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/xai/models/grok-4.5.toml)
- **Status:** Generally available (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/xai/models/grok-4.5.toml)
- **Weights:** Proprietary (API only) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/xai/models/grok-4.5.toml)
- **Context window:** 500K (500,000 tokens) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/xai/models/grok-4.5.toml)
- **Max output:** 500K tokens (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/xai/models/grok-4.5.toml)
- **Input:** Text, images and PDFs (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/xai/models/grok-4.5.toml)
- **Output:** Text (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/xai/models/grok-4.5.toml)
- **Reasoning mode:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/xai/models/grok-4.5.toml)
- **Tool calling:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/xai/models/grok-4.5.toml)
- **Structured output:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/xai/models/grok-4.5.toml)

## API pricing (USD per 1M tokens)

| Provider | Input | Output | Cached input | Context |
|---|---|---|---|---|
| xAI API | $2 | $6 | $0.30 | 500K |
| OpenRouter | $2 | $6 | $0.30 | 500K |
| Vercel AI Gateway | $2 | $6 | $0.30 | 500K |

## FAQ

### What is the context window of Grok 4.5?

Grok 4.5 has a context window of 500,000 tokens (500K) and can generate up to 500,000 tokens in a single response, according to models.dev.

### How much does the Grok 4.5 API cost?

Through xAI API, Grok 4.5 costs $2 per million input tokens and $6 per million output tokens. Prices last verified 4 Oct 2026.

### Is Grok 4.5 open source?

No. Grok 4.5 is a proprietary model; xAI has not released its weights. It is available through APIs including xAI API, OpenRouter, Vercel AI Gateway.

### When was Grok 4.5 released?

xAI released Grok 4.5 on 8 Jul 2026, according to models.dev.

### Which providers offer Grok 4.5?

We track Grok 4.5 on 3 providers: xAI API, OpenRouter, Vercel AI Gateway.

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Data licensed CC BY 4.0. Cite as: AI Model Directory, "Grok 4.5", https://www.aimodel.directory/models/grok-4-5