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Claude 3.5 Sonnet vs Grok 4 Fast
Comprehensive side-by-side LLM comparison
Grok 4 Fast leads with 18.5% higher average benchmark score. Grok 4 Fast offers 1.6M more tokens in context window than Claude 3.5 Sonnet. Grok 4 Fast is $17.30 cheaper per million tokens. Claude 3.5 Sonnet is available on 3 providers. Overall, Grok 4 Fast is the stronger choice for coding tasks.
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Anthropic
This upgraded version of Claude 3.5 Sonnet was released with significant improvements in coding and agentic tool use. Built to deliver enhanced performance in software engineering tasks, it brought substantial gains in reasoning and problem-solving while introducing the groundbreaking computer use capability in public beta, allowing it to interact with computer interfaces like a human.
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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.
10 months newer
Claude 3.5 Sonnet
Anthropic
2024-10-22
Grok 4 Fast
xAI
2025-08-28
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Pricing Comparison
Cost per million tokens (USD)
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Claude 3.5 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 3.5 Sonnet
Average Score:67.2%
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Grok 4 Fast
Average Score:85.7%(+18.5%)
Provider Availability & Performance
Available providers and their performance metrics
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Claude 3.5 Sonnet
3 providers
Anthropic
Throughput: 100 tok/s
Latency: 0.5ms
Bedrock
Throughput: 101 tok/s
Latency: 0.5ms
Throughput: 42 tok/s
Latency: 0.4ms
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Claude 3.5 Sonnet
Avg Score:67.2%
Providers:3
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Grok 4 Fast
Avg Score:85.7%(+18.5%)
Providers:1