Grok 4.3
FrontierClosed weightsTextReasoning
Grok family model by SpaceXAI.
About the Grok family
The Grok family (Grok 1 through 4.5, including Fast, mini, Code Fast, and dated 4.20 builds) from Elon Musk's xAI lineage — reasoning-strong flagships with live X/Twitter data access and a deliberately irreverent style. Grok 4 topped several reasoning benchmarks at launch; 4.x Fast tiers trade depth for speed.
All Grok modelsHow this one is configured
This configuration runs in reasoning mode (thinks step-by-step before answering).
Also runs at: low · medium · high effort
Effort controls how long the model thinks before answering — higher effort usually means better answers on hard problems, at the cost of speed and money. Same model underneath, so they share this page.
Who makes it
SpaceXAIUnited StatesListed name for the Grok model developer (xAI lineage).More from Grok
- Grok 2 (Dec '24)
- Grok 3
- Grok 3 mini Reasoning
- Grok 3 Reasoning Beta
- Grok 4
- Grok 4 Fast (Non-reasoning)
- Grok 4 Fast (Reasoning)
- Grok 4.1 Fast (Non-reasoning)
- Grok 4.1 Fast (Reasoning)
- Grok 4.20 0309 (Non-reasoning)
- Grok 4.20 0309 (Reasoning)
- Grok 4.20 0309 v2 (Non-reasoning)
- Grok 4.20 0309 v2 (Reasoning)
- Grok 4.3 (Non-reasoning)
- Grok 4.5
- Grok Beta
- Grok Build 0.1 0616
- Grok Code Fast 1
- Grok-1