xAI: Grok Build 0.1
Grok Build 0.1 is a reasoning model from xAI released on Apr 16, 2026. It reads text, images and files and writes text, with a 256K token context window and up to 256K tokens per reply.
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It costs $1 per million input tokens and $2 per million output tokens. Cached input bills at $0.20, 80% less than fresh input.
It supports tool calling, structured JSON output and prompt caching.
18 providers serve it, including Vercel AI Gateway, AIHubMix and CrossModel.
- Modalities
- In / out price
- $1 / $2 per 1M
- Context
- 256K
- Max output
- 256K
- Released
- Apr 16, 2026
- Knowledge cutoff
- n/a
- Tool calling
- Structured output
- Reasoning
- Prompt caching
- Open weights
- Free to use
Grok Build 0.1 pricing
USD, as listed on Oct 15, 2026. Most bills are input heavy, so the cached input rate matters as much as the headline price.
| Input | $1 / 1M tokens | |
|---|---|---|
| Output | $2 / 1M tokens | |
| Cached input (read) | $0.20 / 1M tokens | 80% off input |
| Prompts over 200K | $2 in, $4 out | long context rate |
| Prompts over 200K | $2 in, $4 out | long context rate |
Grok Build 0.1 providers
18 providers serve it, including Vercel AI Gateway, AIHubMix and CrossModel. Each host sets its own price and limits, so the cheapest one is not always the one with the longest context.
| Provider | Input /M | Output /M | Cache read /M | Context | Max output |
|---|---|---|---|---|---|
| xAI First party | $1 | $2 | $0.20 | 256K | 256K |
| Vercel AI Gateway | $1 | $2 | $0.20 | 256K | 256K |
| AIHubMix | $1 | $2 | $0.20 | 256K | 256K |
| CrossModel | $1 | $2 | $0.20 | 256K | 256K |
| DevPass (LLM Gateway) | $1 | $2 | $0.20 | 256K | 256K |
| Eden AI | $1 | $2 | $0.20 | 256K | 256K |
| FastRouter | $1 | $2 | – | 256K | 256K |
| Impossibl | $1 | $2 | $0.20 | 256K | 256K |
| Kilo Gateway | $1 | $2 | $0.20 | 256K | 230K |
| LLM Gateway | $1 | $2 | $0.20 | 256K | 256K |
| Merge Gateway | $1 | $2 | $0.20 | 256K | 256K |
| NanoGPT | $1 | $2 | $0.20 | 256K | 230K |
Showing 12 of 18 providers: the lab first, then the major clouds, then the cheapest resellers.
What Grok Build 0.1 costs per month
Pick a workload close to yours or type your own volumes.
Supported request parameters
What you can set when you call Grok Build 0.1 through an OpenAI compatible API.
- Tools
tools - Structured outputs
structured_outputs - Reasoning
reasoning - Temperature
temperature
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Grok Build 0.1 questions
How much does the Grok Build 0.1 API cost?
$1 per million input tokens and $2 per million output tokens, with cached input at $0.20. Prompts over 200K tokens bill at $2 input and $4 output. The estimator on this page turns that into a monthly bill for your own workload.
What is the context window of Grok Build 0.1?
256,000 tokens of input, and it can write up to 256,000 tokens in one reply. As a rough guide, a million tokens is around 750,000 English words.
Which providers serve Grok Build 0.1?
18 providers serve it, including Vercel AI Gateway, AIHubMix and CrossModel. Prices differ by host, so the Providers table on this page lists each one with its input and output price.
Does Grok Build 0.1 support tool calling?
Yes. It accepts tool definitions and can return JSON that matches a schema, which is what an agent needs to call your APIs.
Is Grok Build 0.1 open source?
No. xAI serves it through an API only, so you cannot download the weights or host it yourself.
When was Grok Build 0.1 released?
Apr 16, 2026.
Catalog data from models.dev (MIT licensed), refreshed daily, last on Oct 15, 2026. Independent scores from my hand checked rankings, sources linked above. The summary is written from these facts.
Building on Grok Build 0.1?
I test your real tasks on it and the two closest alternatives, then ship the agent on whichever wins on cost and accuracy.
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