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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 6.4% 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 was developed to bridge human thinking and machine assistance, allowing people to work with language and tools in a more conversational and natural way. Built with a focus on turning ideas into results, it represents an evolution in making AI feel less mechanical while maintaining strong capabilities across reasoning, coding, and collaborative tasks.
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xAI
Grok Code Fast was developed as a specialized coding model optimized for speed, designed to provide rapid code completion, generation, and assistance. Built to serve developers requiring quick feedback and iterative coding support, it combines programming expertise with low-latency responses.
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 1 common benchmarks
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Claude Sonnet 4.5
Average Score:77.2%(+6.4%)
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Grok Code Fast 1
Average Score:70.8%
Performance comparison across key benchmark categories
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Claude Sonnet 4.5
Coding77.2%(+6.4%)
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Grok Code Fast 1
Coding70.8%
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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:77.2%(+6.4%)
Providers:2
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Grok Code Fast 1
Avg Score:70.8%
Providers:1