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Claude Sonnet 4.5 vs Grok-3
Comprehensive side-by-side LLM comparison
Grok-3 leads with 3.7% higher average benchmark score. Claude Sonnet 4.5 offers 128.0K more tokens in context window than Grok-3. Both models have similar pricing. Both models have their strengths depending on your specific coding needs.
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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 3 was introduced as xAI's third-generation flagship model, designed to push the boundaries of reasoning, factual accuracy, and helpful assistance. Built to advance the state of AI capabilities, it incorporates improvements across language understanding, generation, and analytical thinking.
7 months newer
Grok-3
xAI
2025-02-17
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-3
Input:$3.00
Output:$15.00
Performance Metrics
Context window and performance specifications
Average performance across 2 common benchmarks
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Claude Sonnet 4.5
Average Score:85.2%
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Grok-3
Average Score:88.9%(+3.7%)
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Knowledge Cutoff
Training data recency comparison
Grok-3
2024-11-17
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:85.2%
Providers:2
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Grok-3
Avg Score:88.9%(+3.7%)
Providers:1