How much does grok-4.1-fast cost per 1M tokens?

Input is priced at $0.04 per 1M tokens, output at $0.11 per 1M tokens. Billing is per token, no rounding to batch sizes.

How do I access grok-4.1-fast via API?

Send requests to the Routerah /v1/chat/completions endpoint with model=grok-4.1-fast. Any OpenAI-compatible client library works. Authentication uses a standard Bearer token.

xAI: grok-4.1-fast

Name: grok-4.1-fast
Brand: xAI

grok-4.1-fast

2M context128K outReasoningToolsVisionFilesStructuredWeb search

Released Nov 1, 2025Knowledge cutoff Nov 2024Updated Oct 29, 2026

A low-latency, high-throughput variant of Grok-4.1 designed for instant responses. It bypasses the thinking token phase to prioritize speed while excelling in creative writing, emotional intelligence (EQ), and agentic tool-calling across a massive 2M context.

Mode chatDeprecation May 2027

Inputs used for the providers' own purposes

At least one provider of this model uses your inputs for its own purposes, for example to train AI models. Do not enter personal data of third parties or sensitive data. You can object to this use at any time in your account settings or via "Manage consents" in the chat.

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