Everything about Grok Build 0.1

Grok Build 0.1 at a glance

Grok Build 0.1 is a language model from xAI, released on April 16, 2026. That makes it 6 months old as of October 22, 2026. It is a closed model: you access it through an API, from xAI or one of the 19 providers listed on models.dev. It has a reasoning mode: it can "think" before answering, which helps with multi-step problems but uses more tokens, and therefore more money.

We file it under budget models (24 models in this category on the site).

How much does Grok Build 0.1 cost?

Grok Build 0.1 costs $1 per million input tokens and $2 per million output tokens (median of 19 providers, checked on October 22, 2026).

To put it in perspective: reading 20,000 tokens (about thirty pages) and writing 2,000 costs roughly $0.024; a thousand of those tasks, $24.

That is 1.8 times the median output price of budget models ($1.13).

To estimate your own budget, use the agent cost calculator.

Measured performance

As of October 22, 2026, Epoch AI publishes no score for Grok Build 0.1 on our basket's benchmarks. To place it, rely on its specifications and price, then test it on your own cases.

At xAI, the best-scoring model we track is Grok 4.6, with an index of 86.1.

Technical specifications

Its context window reaches 256,000 tokens, roughly 384 pages of text at 500 words per page: enough for a long report or several contracts at once. A single answer can run to 256,000 tokens.

It accepts as input: text, image and PDF.

It can call tools (functions, APIs) and return structured JSON output, which makes it a possible foundation for an AI agent.

When to choose it

Given its category, Grok Build 0.1 is mainly aimed at high volumes where every cent counts: sorting, information extraction, summaries, simple assistants.

Before adopting it, test it on your own examples: benchmarks measure standard tasks, not your job.

Comparable models

In the same category, the models closest to Grok Build 0.1 are:

• GPT-5 Mini (OpenAI, index 62.9)
• Mistral Medium 3 (Mistral AI, $2 per million output tokens)
• Qwen3.7 Plus (Alibaba Cloud (Qwen), index 56.2)
• Gemini 3.1 Flash Lite (Google DeepMind, index 64.3)