# Grok 4.1 Fast

Grok 4.1 Fast is a model from xAI, released on 19 Nov 2025.

- Developer: xAI
- Id: grok-4.1-fast
- Reported: 2025-11-19T00:00:00.000Z
- Released: 2025-11-19T00:00:00.000Z
- Sighting: 2026-09-19T17:20:46.653Z
  - [evidence link](https://models.dev/#grok-4.1-fast)
- Status: Released
- API availability: 2025-11-19
  - [evidence link](https://docs.x.ai/developers/release-notes#grok-41-fast-is-available-in-enterprise-api)
- Canonical: https://alexgetman.com/models/xai/grok-4-1-fast/

## Questions

### When was Grok 4.1 Fast released?

On 19 Nov 2025.

## Timeline

- 2026-10-07T19:38:07.564Z · [xAI · release notes](https://docs.x.ai/developers/release-notes#grok-41-fast-is-available-in-enterprise-api)
> You can now use Grok 4.1 Fast in the xAI Enterprise API

## Evidence links

- [Artificial Analysis · benchmarks](https://artificialanalysis.ai/models)
- [Vertex AI · Model Garden](https://console.cloud.google.com/vertex-ai/publishers/xai/model-garden/grok-4.1-fast-non-reasoning)
- [Vertex AI · Model Garden](https://console.cloud.google.com/vertex-ai/publishers/xai/model-garden/grok-4.1-fast-reasoning)
- [xai-release-notes](https://docs.x.ai/developers/release-notes#grok-41-fast-is-available-in-enterprise-api)
- [TrueFoundry · Azure catalogue](https://github.com/truefoundry/models/blob/main/providers/azure-ai-foundry/grok-4-1-fast-reasoning.yaml)
- [TrueFoundry · Azure catalogue](https://github.com/truefoundry/models/blob/main/providers/microsoft-foundry/grok-4-1-fast-reasoning.yaml)
- [Azure Foundry · lifecycle](https://learn.microsoft.com/en-us/azure/foundry/concepts/model-lifecycle-retirement?view=azureml-api-2)
- [models.dev · catalogue](https://models.dev/#grok-4-1-fast-non-reasoning)
- [models.dev · catalogue](https://models.dev/#grok-4-1-fast-reasoning)
- [models-dev](https://models.dev/#grok-4.1-fast)
- [models.dev · catalogue](https://models.dev/#grok-4.1-fast-non-reasoning)
- [models.dev · catalogue](https://models.dev/#grok-4.1-fast-reasoning)
- [OpenCode · discovery](https://opencode.ai/data/xai/grok-4-1-fast)
- [OpenCode · discovery](https://opencode.ai/data/xai/grok-4-1-fast-reasoning)
- [Arena · leaderboards](https://x.ai/news/grok-4-1-fast)

## Signals

- [Grok 4.1 Fast Reasoning spotted on Arena](https://alexgetman.com/signals/2026/09/11/grok-4-1-fast-reasoning/)