AI Model APIs
AI Model APIsProviders
AI Model APIs

The complete platform for comparing AI models. Find pricing, capabilities, and the perfect model for your use case.

contact@aimodelapis.com

Resources

  • AI Models APIs
  • Providers

About

  • About
  • Contact
  • Privacy Policy
  • Terms of Service

© 2026 AI Model APIs. All rights reserved.

Back to Models
Poe

Grok-4.1-Fast-Reasoning API

Poe
About

Build advanced reasoning agents with Grok-4.1-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-4.1-Fast-Reasoning via the Poe API with up to 30K output tokens.

Capabilities

Input Modalities

textimage

Output Modalities

text
Reasoning
Yes
Structured Output
No
Tool Use
Yes
WeightsClosed
Temperature
Fixed
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-4.1-Fast-Reasoning by Poe costs Free per 1M input tokens and Free per 1M output tokens.

Model Details
ID
xai/grok-4.1-fast-reasoning
Provider
Poe
Family
grok
Release Date
Nov 19, 2025
Knowledge Cutoff
N/A
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
POE_API_KEY
API Base URL
https://api.poe.com/v1
Documentation