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NanoGPT

Grok 4 Fast API

NanoGPT
About

Build advanced reasoning agents with Grok 4 Fast, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $0.20/1M input and $0.50/1M output tokens, native tool calling support. Access Grok 4 Fast via the NanoGPT API with up to 131K 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
Fixed
Attachment
Supported
Limits
Context Window
2.0M

Tokens

Input Limit
2.0M

Tokens

Max Output
131K

Tokens

Pricing

Standard (per 1M tokens)

Input
$0.20
Output
$0.50
Frequently Asked Questions

Grok 4 Fast by NanoGPT costs $0.20 per 1M input tokens and $0.50 per 1M output tokens.

Model Details
ID
x-ai/grok-4-fast
Provider
NanoGPT
Family
grok
Release Date
Sep 20, 2025
Knowledge Cutoff
N/A
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
NANO_GPT_API_KEY
API Base URL
https://nano-gpt.com/api/v1
Documentation