Grok 4.5
Summary
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.
xAI's Grok model for chat, coding, agentic tools, and lower hallucination risk
Last verified 4 Oct 2026. Every figure on this page links to its source.
Specifications
| Developer | xAI |
|---|---|
| Release date | 8 Jul 2026 [models.dev] |
| Status | Generally available [models.dev] |
| Weights | Proprietary (API only) [models.dev] |
| Context window | 500K (500,000 tokens) [models.dev] |
| Max output | 500K tokens [models.dev] |
| Input | Text, images and PDFs [models.dev] |
| Output | Text [models.dev] |
| Reasoning mode | Yes [models.dev] |
| Tool calling | Yes [models.dev] |
| Structured output | Yes [models.dev] |
Grok 4.5 API pricing by provider
USD per million tokens. Sorted by input price.
| Provider | Input | Output | Cached input | Context | Source |
|---|---|---|---|---|---|
| xAI API grok-4.5 | $2 | $6 | $0.30 | 500K | models.dev, 4 Oct 2026 |
| OpenRouter x-ai/grok-4.5 | $2 | $6 | $0.30 | 500K | OpenRouter, 4 Oct 2026 |
| Vercel AI Gateway spacexai/grok-4.5 | $2 | $6 | $0.30 | 500K | models.dev, 4 Oct 2026 |
Frequently asked questions
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.
Change history
No changes detected since we started tracking this model. We re-check every source daily.