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Claude 3 Sonnet vs Grok 4 Fast
Comprehensive side-by-side LLM comparison
Grok 4 Fast leads with 45.3% higher average benchmark score. Grok 4 Fast offers 1.6M more tokens in context window than Claude 3 Sonnet. Grok 4 Fast is $17.30 cheaper per million tokens. Claude 3 Sonnet is available on 3 providers. Overall, Grok 4 Fast is the stronger choice for coding tasks.
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Anthropic
Claude 3 Sonnet was introduced as the balanced middle tier of the Claude 3 family, offering a combination of strong capabilities and operational speed. Designed to provide an optimal tradeoff between intelligence and performance for everyday tasks, it served as a versatile solution for a wide range of enterprise and consumer applications.
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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.
1 year newer
Claude 3 Sonnet
Anthropic
2024-02-29
Grok 4 Fast
xAI
2025-08-28
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Pricing Comparison
Cost per million tokens (USD)
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Claude 3 Sonnet
Input:$3.00
Output:$15.00
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Grok 4 Fast
Input:$0.20
Output:$0.50($17.30 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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Claude 3 Sonnet
Average Score:40.4%
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Grok 4 Fast
Average Score:85.7%(+45.3%)
Provider Availability & Performance
Available providers and their performance metrics
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Claude 3 Sonnet
3 providers
Anthropic
Throughput: 100 tok/s
Latency: 0.5ms
Bedrock
Throughput: 120 tok/s
Latency: 0.5ms
Throughput: 42 tok/s
Latency: 0.4ms
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Claude 3 Sonnet
Avg Score:40.4%
Providers:3
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Grok 4 Fast
Avg Score:85.7%(+45.3%)
Providers:1