All times Eastern (ET)Provider pages checked daily at
ProSign inRSS

Grok 4 Fast Non-Reasoning

API ID grok-4-fast-non-reasoning

grok-4-fast-non-reasoning was an xAI model.

Status
Retired
Released
—
Shutdown
May 15, 2026
Replacement
Grok 4.3grok-4.3

grok-4-fast-non-reasoning stopped serving on May 15, 2026. Requests to it are now redirected to grok-4.3 and billed at its price.

How to migrate to Grok 4.3

Benchmarks

Scores as each source published them
or

No comparison. Pick a model to see the difference on each benchmark.

Arena

ArenaGrok 4 Fast Non-ReasoningRankDateSource
Text
By category
  • Math 1425 rank 117
  • Creative writing 1382 rank 140
  • Instruction following 1395 rank 156
  • Hard prompts 1432 rank 147
  • Long prompts 1418 rank 146
  • Multi-turn 1422 rank 129
  • Expert 1416 rank 162
1419 ±8132 of 415
6,339 votes		Oct 13, 2026source
Text: Coding1457 ±17146 of 410
1,183 votes		Oct 13, 2026source

Rated as grok-4-fast-chat. Ratings come from people voting between two anonymous answers; Text is style-controlled, as on arena.ai. Data: Arena (arena.ai), CC BY 4.0.

On cloud platforms

All platform dates
PlatformPlatform IDStateShutdownTime leftReplacementSource
Microsoft Foundryversion 1grok-4-fast-non-reasoningRetired on May 1, 2026May 1, 2026Grok 4.1 Fast Non-Reasoninggrok-4-1-fast-non-reasoningsource

Microsoft Foundry (version 1) retired this model 14 days before xAI's own API.

Read daily from each platform's own pages. The shutdown date and countdown on this page use xAI's own date.

Price history

USD per 1M tokens, standard tier

No price history yet.

Prices

USD per 1M tokens, every type and band, by tier

No published prices.

Changelog

Changes we detected on xAI's pages
  1. Retired

    grok-4-fast-non-reasoning has been retired

    Info

Last checked · Sources: xAI pricing, xAI notices, xAI release notes