Grok 4 Heavy
Grok 4 Heavy is an AI model released by SpaceXAI on Wednesday, Jul 9 2025, the same day as Grok 4.
Grok 4 Heavy — frequently asked questions
- When was Grok 4 Heavy released?
- Grok 4 Heavy was released by SpaceXAI on Wednesday, Jul 9 2025.
- Who made Grok 4 Heavy?
- Grok 4 Heavy was built by SpaceXAI. Elon Musk's AI company building the Grok series of models. Founded in 2023 as xAI, now part of SpaceX.
- Is Grok 4 Heavy open source?
- No. Grok 4 Heavy is a proprietary model. The weights are not published — it is available only through the provider's own API, apps, or partner platforms.
- What came before and after Grok 4 Heavy?
- SpaceXAI's previous tracked release was Grok 4 on Jul 9 2025. It was followed by Grok 2.5 on Aug 23 2025.