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Grok 4 Fast vs Grok-3
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. Grok 4 Fast is $17.30 cheaper per million tokens. Both models have their strengths depending on your specific coding needs.
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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 3 was introduced as xAI's third-generation flagship model, designed to push the boundaries of reasoning, factual accuracy, and helpful assistance. Built to advance the state of AI capabilities, it incorporates improvements across language understanding, generation, and analytical thinking.
6 months newer
Grok-3
xAI
2025-02-17
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($17.30 cheaper)
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Grok-3
Input:$3.00
Output:$15.00
Performance Metrics
Context window and performance specifications
Average performance across 3 common benchmarks
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Grok 4 Fast
Average Score:85.9%(+0.1%)
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Grok-3
Average Score:85.8%
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Knowledge Cutoff
Training data recency comparison
Grok-3
2024-11-17
More recent knowledge cutoff means awareness of newer technologies and frameworks
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-3
1 providers
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Grok 4 Fast
Avg Score:85.9%(+0.1%)
Providers:1
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Grok-3
Avg Score:85.8%
Providers:1