# Grok 4 spotted on models.dev

Grok 4 is a model from xAI, released on 9 Jul 2025. First seen 19 Sep 2026. Catalogues list a 256,000 tokens context window. 3 evidence links.

- Kind: Sighting
- Developer: xAI
- Confidence: Confirmed
- First seen: 2026-09-19T17:20:46.653Z
- Model: [Grok 4](https://alexgetman.com/models/xai/grok-4/)
- Canonical: https://alexgetman.com/signals/2026/09/19/grok-4/

## Evidence links

- [models.dev · catalogue](https://models.dev/#grok-4)
- [Artificial Analysis · benchmarks](https://artificialanalysis.ai/models)
- [Azure Foundry · lifecycle](https://learn.microsoft.com/en-us/azure/foundry/concepts/model-lifecycle-retirement?view=azureml-api-2)