AI provider / xAI
xAI
A provider associated with Grok, real-time product experiences and a fast-moving frontier narrative around reasoning, coding and multimodal AI.
xAI is the fast-moving frontier lab behind Grok, built to fold real-time information and a more direct assistant voice into a single product. From Grok-1 — later open-sourced under Apache 2.0 — to GPT-4-class Grok-2, the line scaled quickly and publicly.
Grok 3 debuted on the 200K-GPU Colossus cluster, Grok 4 claimed top reasoning with native tool use, and the 4.x series added Fast and code-fast spinoffs plus multi-agent experiments. The defining trait is pace: an aggressive product cadence tied directly to live environments.
Model catalog
Every release in this provider’s model line.
Each row is a distinct model release — its date, its type and the traits it is known for. Open a source to dig into any of them.
| Model | Released | Type | Key traits | Source |
|---|---|---|---|---|
| Grok 4.20 Beta | Feb 2026 | Experimental |
| Digital Applied |
| Grok 4.1 | Nov 2025 | Version update |
| xAI |
| Grok 4 | Jul 2025 | Flagship |
| xAI |
| Grok 3 | Feb 2025 | Flagship |
| xAI |
| Grok-2 | Aug 2024 | Version update |
| xAI |
| Grok-1 (open weights) | Mar 2024 | Open release |
| xAI |
| Grok-1 | Nov 2023 | Debut |
| xAI |
Timeline
A practical timeline of model releases and company milestones.
This page tracks the moments that matter most: major model releases, version jumps and company moves that changed how this provider shows up in the AI market.
Grok 4.20 Beta experiments with multi-agent architecture.
A 4-agent system, then a 16-agent Heavy variant, preview the orchestration approach intended for Grok 5.
Grok 4.1 refines the flagship after Fast and code-fast spinoffs.
September’s Grok 4 Fast and the grok-code-fast coding line get folded into a steadier release rhythm.
Grok 4 claims top reasoning scores with native tool use.
A Heavy multi-agent tier and real-time search integration mark xAI’s shift from chasing to setting benchmarks.
Grok 3 debuts on the 200K-GPU Colossus cluster.
Trained with 10x Grok-2’s compute, it ships with Think mode and DeepSearch — scale as the headline argument.
Grok-2 reaches GPT-4 class and adds image generation.
After Grok-1.5 brought long context and vision in spring, Grok-2 closes the frontier gap in under a year.
Grok-1 weights go open under Apache 2.0.
The 314B release lands amid the Musk-OpenAI lawsuit, doubling as a statement about what “open” AI should mean.
Grok-1 launches with real-time X data and an attitude.
Four months after xAI’s founding, the 314B MoE debuts inside X Premium, differentiating on live data and irreverence.