Comprehensive side-by-side LLM comparison
Both models show comparable benchmark performance. Grok 4 Fast offers 1.9M more tokens in context window than Grok-3 Mini. Both models have similar pricing. Both models have their strengths depending on your specific coding needs.
xAI
Grok 4 Fast is a multimodal language model developed by xAI. It achieves strong performance with an average score of 73.0% across 7 benchmarks. It excels particularly in SimpleQA (95.0%), HMMT 2025 (93.3%), AIME 2025 (92.0%). With a 2.0M token context window, it can handle extensive documents and complex multi-turn conversations. The model is available through 1 API provider. As a multimodal model, it can process and understand text, images, and other input formats seamlessly. Released in 2025, it represents xAI's latest advancement in AI technology.
xAI
Grok 3 Mini was developed as an efficient version of Grok 3, designed to bring next-generation capabilities to resource-conscious deployments. Built to provide strong performance with practical efficiency, it extends Grok 3's innovations to broader application scenarios.
6 months newer

Grok-3 Mini
xAI
2025-02-17

Grok 4 Fast
xAI
2025-08-28
Cost per million tokens (USD)

Grok 4 Fast

Grok-3 Mini
Context window and performance specifications
Average performance across 3 common benchmarks

Grok 4 Fast

Grok-3 Mini
Grok-3 Mini
2024-11-17
Available providers and their performance metrics

Grok 4 Fast
xAI

Grok-3 Mini

Grok 4 Fast

Grok-3 Mini

Grok 4 Fast

Grok-3 Mini
xAI