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Claude Sonnet 4 vs Claude Sonnet 4.5
Comprehensive side-by-side LLM comparison
Claude Sonnet 4.5 leads with 8.8% higher average benchmark score. Claude Sonnet 4 offers 64.0K more tokens in context window than Claude Sonnet 4.5. Both models have similar pricing. Claude Sonnet 4 is available on 4 providers. Overall, Claude Sonnet 4.5 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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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.
4 months newer
Claude Sonnet 4
Anthropic
2025-05-22
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
Input:$3.00
Output:$15.00
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Claude Sonnet 4.5
Input:$3.00
Output:$15.00
Performance Metrics
Context window and performance specifications
Average performance across 7 common benchmarks
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Claude Sonnet 4
Average Score:68.7%
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Claude Sonnet 4.5
Average Score:77.6%(+8.8%)
Performance comparison across key benchmark categories
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Claude Sonnet 4
Coding72.7%
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Claude Sonnet 4.5
Coding77.2%(+4.5%)
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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
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:68.7%
Providers:4
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Claude Sonnet 4.5
Avg Score:77.6%(+8.8%)
Providers:2