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Claude Sonnet 4.5 vs Grok Code Fast 1
Comprehensive side-by-side LLM comparison
Claude Sonnet 4.5 leads with 67.9% higher average benchmark score. Grok Code Fast 1 offers 2.0K more tokens in context window than Claude Sonnet 4.5. Grok Code Fast 1 is $16.30 cheaper per million tokens. Claude Sonnet 4.5 supports multimodal inputs. Overall, Claude Sonnet 4.5 is the stronger choice for coding tasks.
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Anthropic
Claude Sonnet 4.5 is a multimodal language model developed by Anthropic. It achieves strong performance with an average score of 75.8% across 9 benchmarks. It excels particularly in MMMLU (89.1%), AIME 2025 (87.0%), TAU-bench Retail (86.2%). It supports a 264K token context window for handling large documents. The model is available through 2 API providers. As a multimodal model, it can process and understand text, images, and other input formats seamlessly. Released in 2025, it represents Anthropic's latest advancement in AI technology.
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xAI
Grok Code Fast 1 is a language model developed by xAI. It achieves strong performance with an average score of 70.8% across 1 benchmarks. Notable strengths include SWE-Bench Verified (70.8%). It supports a 266K token context window for handling large documents. The model is available through 1 API provider. Released in 2025, it represents xAI's latest advancement in AI technology.
1 month newer
Grok Code Fast 1
xAI
2025-08-28
Claude Sonnet 4.5
Anthropic
2025-09-29
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Pricing Comparison
Cost per million tokens (USD)
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Claude Sonnet 4.5
Input:$3.00
Output:$15.00
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Grok Code Fast 1
Input:$0.20
Output:$1.50($16.30 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 9 common benchmarks
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Claude Sonnet 4.5
Average Score:75.8%(+67.9%)
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Grok Code Fast 1
Average Score:7.9%
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Knowledge Cutoff
Training data recency comparison
Claude Sonnet 4.5
2025-01-31
More recent knowledge cutoff means awareness of newer technologies and frameworks
Provider Availability & Performance
Available providers and their performance metrics
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Claude Sonnet 4.5
2 providers
Anthropic
Throughput: 42 tok/s
Latency: 0.4ms
ZeroEval
Throughput: 42 tok/s
Latency: 0.4ms
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Claude Sonnet 4.5
Avg Score:75.8%(+67.9%)
Providers:2
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Grok Code Fast 1
Avg Score:7.9%
Providers:1