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ModelSpaceXSI

Grok 4.1 Fast

Model at SpaceXSI

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Grok 4.1 Fast does not have a researched profile yet. Everything here comes from its recorded changes and public listings, each linked to its source.

The basics

As of Nov 1
Status
Retired May 15, 2026

Updates

Retired

xAI retires older Grok models, requests redirect to Grok 4.3

On May 15, 2026 xAI retired grok-4-1-fast, grok-4-fast, grok-4-0709, grok-code-fast-1, grok-3 and grok-imagine-image-pro. Requests to these slugs redirect to grok-4.3 (or grok-build-0.1 for grok-code-fast-1) and are billed at grok-4.3 rates of $1.25 input and $2.50 output per 1M tokens.

After

grok-4.3 at $1.25 / $2.50 per 1M tokens

Action needed:
Set the model explicitly to grok-4.3 with the reasoning effort you want, or grok-build-0.1 for coding.
Full changelog, by month

Role

Frontier model at SpaceXSI

  1. Grok 4.1 Fast

    Until May 2026

Works with

From recorded changes
Grok API

API · 1 shared change

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Similar models for now. Real viewing data comes after launch.

Benchmarks

Higher is better. Green is Grok 4.1 Fast. Dark marks are similar models.

Independent

What people say

Reviews

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Writing habits

Creative writing · EQ-Bench, among 51 models tracked here

Slop score

36.5

Overused AI words and phrases. Less slop than 10% of tracked models.

Repetition

4.6

Repeated words and ideas. Less repetition than 20% of tracked models.

Story length

6,483

Average characters per story. Longer than 56% of tracked models.