xAI was founded by Elon Musk in March 2023 and is known for the Grok family of chatbots and models. SpaceX acquired it in February 2026, and it has since been renamed SpaceXAI and then SpaceX Super Intelligence. It is based in Palo Alto, California.
- Founded
- 2023
- Type
- Corporate division
- Founders
- Elon Musk, Igor Babuschkin and Kyle Kosic
- AI lab
- Inference provider
- 38 hosted endpoints
Model family
Grok
xAI was founded by Elon Musk in March 2023 and is known for the Grok family of chatbots and models. SpaceX acquired it in February 2026, and it has since been renamed SpaceXAI and then SpaceX Super Intelligence. It is based in Palo Alto, California.
Latest Grok models
Models in this family
14 catalogued models
14 models · 1–14
| Select models to compare | Model | Released | Context | Input /M | Output /M | Parameters | Type | I/O | Openness |
|---|---|---|---|---|---|---|---|---|---|
| Grok 4.7xAI | September 21, 2026 | 500K | $2.00 | $6.00 | — | Text | text, image, file → text | Closed | |
| Grok 4.6xAI | August 12, 2026 | 500K | $2.00 | $6.00 | — | Text | text, image, file → text | Closed | |
| Grok 4.5xAI | July 8, 2026 | 500K | $2.00 | $6.00 | — | Text | text, image, file → text | Closed | |
| Grok 4.3xAI | April 17, 2026 | 1M | $1.25 | $2.50 | — | Text | text, image, file → text | Closed | |
| Grok TTSxAI | March 16, 2026 | 15K | — | — | — | Audio | text → audio | Closed | |
| Grok 4.20xAI | March 10, 2026 | 2M | $1.25 | $2.50 | — | Text | text, image, file → text | Closed | |
| Grok 4.20 Multi-AgentxAI | March 10, 2026 | 2M | $1.25 | $2.50 | — | Text | text, image, file → text | Closed | |
| Grok 4.20 (Non-Reasoning)xAI | March 9, 2026 | 1M | — | — | — | Text | text, image, file → text | Closed | |
| Grok 4.20 (Reasoning)xAI | March 9, 2026 | 1M | — | — | — | Text | text, image, file → text | Closed | |
| X-Ai/Grok-4-Fast-Non-ReasoningxAI | December 18, 2025 | 2M | — | — | — | Text | text, image, audio, video → text | Closed | |
| X-Ai/Grok-4-Fast-ReasoningxAI | December 18, 2025 | 2M | — | — | — | Text | text, image, audio, video → text | Closed | |
| Grok 4.1 FastxAI | November 19, 2025 | 2M | — | — | — | Text | text, image → text | Closed | |
| Grok 4.1 Fast (Reasoning)xAI | November 19, 2025 | 2M | — | — | — | Text | text, image → text | Closed | |
| x-AI/Grok-Code-Fast 1xAI | September 2, 2025 | 256K | — | — | — | Text | text → text | Closed |