Grok Build 0.1
Summary
Grok Build 0.1 is a proprietary language model from xAI, released on 16 Apr 2026. It accepts text, images and PDFs and generates text, with a 256K-token context window and up to 256K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $1 per million input tokens and $2 per million output tokens (xAI API), across 3 providers we track.
Fast Grok coding model tuned for agentic engineering and iterative edits
Last verified 4 Oct 2026. Every figure on this page links to its source.
Specifications
| Developer | xAI |
|---|---|
| Release date | 16 Apr 2026 [models.dev] |
| Status | Generally available [models.dev] |
| Weights | Proprietary (API only) [models.dev] |
| Context window | 256K (256,000 tokens) [models.dev] |
| Max output | 256K 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 Build 0.1 API pricing by provider
USD per million tokens. Sorted by input price.
| Provider | Input | Output | Cached input | Context | Source |
|---|---|---|---|---|---|
| xAI API grok-build-0.1 | $1 | $2 | $0.20 | 256K | models.dev, 4 Oct 2026 |
| OpenRouter x-ai/grok-build-0.1 | $1 | $2 | $0.20 | 256K | OpenRouter, 4 Oct 2026 |
| Vercel AI Gateway spacexai/grok-build-0.1 | $1 | $2 | $0.20 | 256K | models.dev, 4 Oct 2026 |
Frequently asked questions
What is the context window of Grok Build 0.1?
Grok Build 0.1 has a context window of 256,000 tokens (256K) and can generate up to 256,000 tokens in a single response, according to models.dev.
How much does the Grok Build 0.1 API cost?
Through xAI API, Grok Build 0.1 costs $1 per million input tokens and $2 per million output tokens. Prices last verified 4 Oct 2026.
Is Grok Build 0.1 open source?
No. Grok Build 0.1 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 Build 0.1 released?
xAI released Grok Build 0.1 on 16 Apr 2026, according to models.dev.
Which providers offer Grok Build 0.1?
We track Grok Build 0.1 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.