# Grok 4.5

Grok 4.5 is a language model from SpaceXAI with a 500K-token context window. Provider list price is $2 per million input tokens and $6 per million output; on Allocate you pay $2.14 and $6.42. It is a closed model served over API; the weights are not published.

## Pricing

| | Provider list | On Allocate |
| --- | --- | --- |
| Input, per M tokens | $2 | $2.14 |
| Output, per M tokens | $6 | $6.42 |
| Cached input, per M tokens | $0.30 | $0.32 |

Prices checked 2026-07-21.

## Facts

| Field | Value |
| --- | --- |
| Lab | SpaceXAI |
| Modality | Language |
| Context window | 500K tokens |
| License | Proprietary API |
| Open weights | No |
| Fine-tunable | No |
| Catalog id | xai/grok-4.5 |

## What a real workload costs

Take 1,000,000 requests a month at 1,200 input and 350 output tokens each: 1,200M input and 350M output tokens. At list prices that is 1,200 × $2 + 350 × $6 = $4,500 a month. Billed on Allocate it is $4,815.

## Common questions

### How much does Grok 4.5 cost per million tokens?

Provider list price is $2 per million input tokens and $6 per million output tokens. On Allocate you pay $2.14 in and $6.42 out.

### What context window does Grok 4.5 have?

500,000 tokens (500K). At roughly 0.75 words per token, that is about 375k words of English text per request.

### What does cached input cost on Grok 4.5?

$0.30 per million tokens at list ($0.32 billed). Repeated prompt prefixes, such as a stable system prompt or tool definitions, bill at this rate instead of the full input price.

### Can I fine-tune Grok 4.5?

No. Grok 4.5 is a closed model served over API; the weights are not published. If you want a model you can train and own, start from an open-weights base in the catalog and fine-tune that.

### How do I call Grok 4.5 on Allocate?

Send xai/grok-4.5 in the model field of the OpenAI-compatible endpoint at api.allocate.network/v1, or point a route name (like prod/support-agent) at it so you can swap the model later without a deploy.

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[HTML page](https://allocate.network/models/xai-grok-4-5) · [Machine-readable catalog](https://allocate.network/catalog.json)