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Firmware

Grok 4 Fast (Reasoning) API

Firmware
About

Build advanced reasoning agents with Grok 4 Fast (Reasoning), a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers available completely free of charge, native tool calling support. Access Grok 4 Fast (Reasoning) via the Firmware API with up to 30K output tokens.

Capabilities

Input Modalities

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Output Modalities

text
Reasoning
Yes
Structured Output
No
Tool Use
Yes
WeightsClosed
Temperature
Adjustable
Attachment
Supported
Limits
Context Window
2.0M

Tokens

Input Limit
2.0M

Tokens

Max Output
30K

Tokens

Pricing

Standard (per 1M tokens)

Input
Free
Output
Free
Frequently Asked Questions

Grok 4 Fast (Reasoning) by Firmware costs Free per 1M input tokens and Free per 1M output tokens.

Model Details
ID
grok-4-fast-reasoning
Provider
Firmware
Family
grok
Release Date
Sep 19, 2025
Knowledge Cutoff
Jul 1, 2025
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
FIRMWARE_API_KEY
API Base URL
https://app.frogbot.ai/api/v1
Documentation