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Helicone

xAI Grok 4.1 Fast Reasoning API

Helicone
About

Build advanced reasoning agents with xAI Grok 4.1 Fast Reasoning, 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 xAI Grok 4.1 Fast Reasoning via the Helicone API with up to 2.0M output tokens.

Capabilities

Input Modalities

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Output Modalities

text
Reasoning
Yes
Structured Output
No
Tool Use
Yes
WeightsClosed
Temperature
Adjustable
Attachment
Not Supported
Limits
Context Window
2.0M

Tokens

Input Limit
2.0M

Tokens

Max Output
2.0M

Tokens

Pricing

Standard (per 1M tokens)

Input
$0.20
Output
$0.50

Caching (per 1M tokens)

Read
$0.05
Frequently Asked Questions

xAI Grok 4.1 Fast Reasoning by Helicone costs $0.20 per 1M input tokens and $0.50 per 1M output tokens. Cached reads cost $0.05 per 1M tokens.

Model Details
ID
grok-4-1-fast-reasoning
Provider
Helicone
Family
grok
Release Date
Nov 17, 2025
Knowledge Cutoff
Nov 1, 2025
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
HELICONE_API_KEY
API Base URL
https://ai-gateway.helicone.ai/v1
Documentation