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Claude 3.5 Sonnet vs Claude Sonnet 4.5
Comprehensive side-by-side LLM comparison
Claude Sonnet 4.5 leads with 21.4% higher average benchmark score. Claude 3.5 Sonnet offers 136.0K more tokens in context window than Claude Sonnet 4.5. Both models have similar pricing. Overall, Claude Sonnet 4.5 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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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.
11 months newer
Claude 3.5 Sonnet
Anthropic
2024-10-22
Claude Sonnet 4.5
Anthropic
2025-09-29
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Pricing Comparison
Cost per million tokens (USD)
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Claude 3.5 Sonnet
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 4 common benchmarks
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Claude 3.5 Sonnet
Average Score:57.9%
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Claude Sonnet 4.5
Average Score:79.2%(+21.4%)
Performance comparison across key benchmark categories
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Claude 3.5 Sonnet
Coding49.0%
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Claude Sonnet 4.5
Coding77.2%(+28.2%)
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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 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:57.9%
Providers:3
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Claude Sonnet 4.5
Avg Score:79.2%(+21.4%)
Providers:2