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FastRouter

Grok Build 0.1 API

FastRouter
About

Build advanced reasoning agents with Grok Build 0.1, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $1.00/1M input and $2.00/1M output tokens, native tool calling support. Access Grok Build 0.1 via the FastRouter API with up to 256K output tokens.

Capabilities

Input Modalities

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Output Modalities

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Reasoning
Yes
Structured Output
Yes
Tool Use
Yes
WeightsClosed
Temperature
Adjustable
Attachment
Supported
Limits
Context Window
256K

Tokens

Input Limit
256K

Tokens

Max Output
256K

Tokens

Pricing

Standard (per 1M tokens)

Input
$1.00
Output
$2.00
Frequently Asked Questions

Grok Build 0.1 by FastRouter costs $1.00 per 1M input tokens and $2.00 per 1M output tokens.

Model Details
ID
x-ai/grok-build-0.1
Provider
FastRouter
Family
grok-build
Release Date
Apr 16, 2026
Knowledge Cutoff
N/A
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
FASTROUTER_API_KEY
API Base URL
https://go.fastrouter.ai/api/v1
Documentation