Grok Code Fast 1

ActivexAIxai/grok-code-fast-12 platforms

Redirected. Grok Code Fast 1 is active on 2 platforms, with no shutdown date announced. xAI names Grok Build 0.1 as the replacement.

Dates on every platform

2 listings · a floor is the earliest possible date

Grok Code Fast 1 on each platform: model ID, status, dates, replacement and source
Platform	Model ID and status	Deprecated	Shuts down	Replacement
Azure AI FoundryMicrosoft: Model retirement schedule - Microsoft Foundry (opens in a new tab) · checked Oct 14, 2026	`grok-code-fast-1:1`Active	–	None set	–
xAI APIxAI: Grok Model Retirement on May 15, 2026 (opens in a new tab) · checked Oct 14, 2026	`grok-code-fast-1`Shut down	–	May 15, 2026Shut down	Grok Build 0.1

Since the retirement, requests to grok-code-fast-1 are served by grok-build-0.1.

Since May 15, 2026, requests to grok-code-fast-1 on xAI API are answered by Grok Build 0.1, with no error. Behavior and price follow the newer model.

No breaking changes are recorded for the move to Grok Build 0.1. Run your own cases on it before the date.

Third-party results, credited below

Third-party benchmark scores for Grok Code Fast 1
Benchmark	Publisher	Score	Rank	Published
Arena WebDev	Arena	1,168 ± 14	#67 of 69	Oct 8, 2026

Arena (arena.ai), https://arena.ai/leaderboard

$ per 1M tokens, with each price’s source

List prices per 1M tokens, in US dollars
Platform	Input	Cached	Output	In effect	Source
Azure AI Foundry`grok-code-fast-1:1`	$0.20	–	$1.50	Nov 1, 2025Current · Global Standard rate from the US East 2 price list.	Microsoft: Azure Retail Prices API (Foundry Models, US East 2) (opens in a new tab)

May 15, 2026Redirectgrok-code-fast-1 retired on the xAI API and redirected to Grok Build 0.1xAI API

xAI retired grok-code-fast-1. Requests to the slug are routed to grok-build-0.1, which now lists grok-code-fast-1 as an alias.