Grok 4

ActivexAIxai/grok-42 platforms

What breaks Add its dates to my calendar

Redirected. Grok 4 is active on 2 platforms, with no shutdown date announced. xAI names Grok 4.3 as the replacement.

Next shutdown: None setNo date on 2 platforms
Arena Text: 1,411#70 of 128 · Arena
Context window: 256Ktokens
Released: Jul 9, 2025xAI

Dates on every platform

2 listings · a floor is the earliest possible date

Grok 4 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-4:1`Active	–	None set	–
xAI APIxAI: Grok Model Retirement on May 15, 2026 (opens in a new tab) · checked Oct 14, 2026	`grok-4-0709`Shut down	–	May 15, 2026Shut down	Grok 4.3

Since the retirement, requests to grok-4-0709 are served by grok-4.3 with low reasoning effort and billed at grok-4.3 rates.

Since May 15, 2026, requests to grok-4-0709 on xAI API are answered by Grok 4.3, with no error. Behavior and price follow the newer model.

What breaks when you move off Grok 4

Pricing
Requests to the retired slugs are billed at grok-4.3 rates, not the rates of the original model.
Grok 4.1 Fast (Reasoning), Grok 4.1 Fast (Non-Reasoning), Grok 4 Fast (Reasoning), Grok 4 Fast (Non-Reasoning), Grok 4, Grok 3 to Grok 4.3 · xAI API · May 15, 2026
Defaults
Reasoning slugs are served with low reasoning effort and non-reasoning slugs with none; set medium or high explicitly for deeper reasoning.
Grok 4.1 Fast (Reasoning), Grok 4.1 Fast (Non-Reasoning), Grok 4 Fast (Reasoning), Grok 4 Fast (Non-Reasoning), Grok 4, Grok 3 to Grok 4.3 · xAI API · May 15, 2026
Parameters
grok-4.20 and newer models silently ignore logprobs and top_logprobs.
Grok 4.1 Fast (Reasoning), Grok 4.1 Fast (Non-Reasoning), Grok 4 Fast (Reasoning), Grok 4 Fast (Non-Reasoning), Grok 4, Grok 3 to Grok 4.3 · xAI API · May 15, 2026

Intelligence

Third-party results, credited below

Third-party benchmark scores for Grok 4
Benchmark	Publisher	Score	Rank	Published
Arena Text	Arena	1,411 ± 2	#70 of 128	Oct 8, 2026

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

List prices

$ 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-4:1`	$3.00	–	$15.00	Jan 1, 2026Current · 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)

Change history

May 15, 2026RedirectSix Grok models retired on the xAI API and redirected to Grok 4.3xAI API3 breaks

xAI retired grok-4-1-fast-reasoning, grok-4-1-fast-non-reasoning, grok-4-fast-reasoning, grok-4-fast-non-reasoning, grok-4-0709 and grok-3. The slugs still resolve: requests are served by grok-4.3 instead of returning an error.

Platform: xAI API
Models: Grok 4.1 Fast (Reasoning), Grok 4.1 Fast (Non-Reasoning), Grok 4 Fast (Reasoning), Grok 4 Fast (Non-Reasoning), Grok 4, Grok 3
Replacement: Grok 4.3

PricingRequests to the retired slugs are billed at grok-4.3 rates, not the rates of the original model.
DefaultsReasoning slugs are served with low reasoning effort and non-reasoning slugs with none; set medium or high explicitly for deeper reasoning.
Parametersgrok-4.20 and newer models silently ignore logprobs and top_logprobs.

Source: xAI, Grok Model Retirement on May 15, 2026 (opens in a new tab); xAI, Models (opens in a new tab)