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Claude Sonnet 4 vs Grok 4 Fast
Comprehensive side-by-side LLM comparison
Grok 4 Fast leads with 15.9% higher average benchmark score. Grok 4 Fast offers 1.7M more tokens in context window than Claude Sonnet 4. Grok 4 Fast is $17.30 cheaper per million tokens. Claude Sonnet 4 is available on 4 providers. Overall, Grok 4 Fast is the stronger choice for coding tasks.
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Anthropic
Claude Sonnet 4 was created as the balanced offering in the Claude 4 family, designed to provide strong intelligence with practical speed and cost efficiency. Built to serve as a versatile workhorse for diverse applications, it balances advanced capabilities with operational considerations for everyday enterprise and consumer use.
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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.
3 months newer
Claude Sonnet 4
Anthropic
2025-05-22
Grok 4 Fast
xAI
2025-08-28
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Pricing Comparison
Cost per million tokens (USD)
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Claude Sonnet 4
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 2 common benchmarks
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Claude Sonnet 4
Average Score:73.0%
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Grok 4 Fast
Average Score:88.9%(+15.9%)
Provider Availability & Performance
Available providers and their performance metrics
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Claude Sonnet 4
4 providers
Anthropic
Throughput: 42 tok/s
Latency: 0.4ms
Bedrock
Throughput: 101 tok/s
Latency: 0.5ms
Throughput: 42 tok/s
Latency: 0.4ms
ZeroEval
Throughput: 42 tok/s
Latency: 0.4ms
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Claude Sonnet 4
Avg Score:73.0%
Providers:4
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Grok 4 Fast
Avg Score:88.9%(+15.9%)
Providers:1