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Grok 4 Fast vs Grok-2
Comprehensive side-by-side LLM comparison
Grok 4 Fast leads with 29.7% higher average benchmark score. Grok 4 Fast offers 1.9M more tokens in context window than Grok-2. Grok 4 Fast is $11.30 cheaper per million tokens. Overall, Grok 4 Fast is the stronger choice for coding tasks.
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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.
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xAI
Grok 2 was developed as the second generation of xAI's language model family, designed to provide enhanced reasoning, knowledge, and conversational abilities. Built with architectural improvements and expanded training, it represents a significant advancement in xAI's model capabilities.
1 year newer
Grok-2
xAI
2024-08-13
Grok 4 Fast
xAI
2025-08-28
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Pricing Comparison
Cost per million tokens (USD)
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Grok 4 Fast
Input:$0.20
Output:$0.50($11.30 cheaper)
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Grok-2
Input:$2.00
Output:$10.00
Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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Grok 4 Fast
Average Score:85.7%(+29.7%)
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Grok-2
Average Score:56.0%
Provider Availability & Performance
Available providers and their performance metrics
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Grok 4 Fast
1 providers
xAI
Throughput: 90 tok/s
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Grok-2
1 providers
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Grok 4 Fast
Avg Score:85.7%(+29.7%)
Providers:1
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Grok-2
Avg Score:56.0%
Providers:1