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Claude Sonnet 4 vs Claude Sonnet 4.5
Comprehensive side-by-side LLM comparison
Claude Sonnet 4.5 leads with 12.7% 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 is a multimodal language model developed by Anthropic. It achieves strong performance with an average score of 69.4% across 8 benchmarks. It excels particularly in MMMLU (86.5%), TAU-bench Retail (80.5%), GPQA (75.4%). It supports a 328K token context window for handling large documents. The model is available through 4 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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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.
4 months newer
Claude Sonnet 4
Anthropic
2025-05-22
Claude Sonnet 4.5
Anthropic
2025-09-29
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 10 common benchmarks
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Claude Sonnet 4
Average Score:55.5%
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Claude Sonnet 4.5
Average Score:68.2%(+12.7%)
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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:55.5%
Providers:4
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Claude Sonnet 4.5
Avg Score:68.2%(+12.7%)
Providers:2