# grok-4-1-fast-non-reasoning — Retired — shutdown May 15, 2026

For grok-4-1-fast-non-reasoning, provider is xAI; lifecycle status is Retired; shutdown / retirement date is May 15, 2026; recommended replacement is grok-4.3 with none reasoning effort; platform / deployment scope is xAI API, recorded from its source on 2026-09-09.

- **Provider:** xAI _(our reading, not quoted from the source)_
- **Model ID / API name:** grok-4-1-fast-non-reasoning _(verified: appears in the quote below)_
- **Lifecycle status:** Retired
- **Shutdown / retirement date:** May 15, 2026 _(verified: appears in the quote below)_
- **Recommended replacement:** grok-4.3 with none reasoning effort _(verified: appears in its own passage below)_
- **Platform / deployment scope:** xAI API _(our reading, not quoted from the source)_

## What the source says

> As we continue advancing Grok, we are retiring several earlier models to focus fully on our newest generation. Effective May 15, 2026 at 12:00 PM PT, the following models will be retired from the xAI API: grok-4-1-fast-reasoning grok-4-1-fast-non-reasoning grok-4-fast-reasoning grok-4-fast-non-reasoning grok-4-0709 grok-code-fast-1 grok-3 grok-imagine-image-pro

## Where each value comes from

This source states these in separate places, so each value is shown with the passage that states it.

### Recommended replacement

> grok-4-1-fast-non-reasoning | grok-4.3 with none reasoning effort |

## Source

- https://docs.x.ai/developers/migration/may-15-retirement

Last verified: 2026-09-09. Review by: 2026-10-09.
Part of [AI model deprecation and retirement dates by provider](https://referencesource.org/ai-model-deprecation-and-retirement/).