Grok 4.3 vs Grok 4 Fast
Compare Grok 4.3 and Grok 4 Fast side by side. See pricing, capabilities, context length, and performance. Use both on Krater.ai from $20/mo.
Grok 4.3 vs Grok 4 Fast: strengths, best use cases and how to run both side by side. The live page adds context windows, token pricing and more comparisons once it loads.
Try both on Krater
Run Grok 4.3 and Grok 4 Fast on the same prompt in the Krater Model Arena, then keep the winner in your workflow. One subscription covers both, from $20 a month.
Open Krater chat · Grok 4.3 on Krater · Grok 4 Fast on Krater
What each model is best at
Grok 4.3
xAI's Grok 4.3 is the latest flagship in the Grok family, with a 1M-token context window, improved reasoning, and real-time knowledge access. Built for truth-seeking conversation and complex problem solving.
Strengths
- 1M-token context for huge documents
- Real-time knowledge access
- Strong reasoning and analysis
- Distinctive voice — direct, witty, less hedging
Best for
- Long-document analysis
- Conversational research
- Coding with extended context
- Real-time fact-checking
How we compare models
Our tested head-to-heads run the same prompt set through both models in the Model Arena, then rank answers blind. Read the testing methodology, or browse every comparison.