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Claude Sonnet 4.5 vs DeepSeek-V3.1
Comprehensive side-by-side LLM comparison
Claude Sonnet 4.5 leads with 18.9% higher average benchmark score. DeepSeek-V3.1 offers 63.7K more tokens in context window than Claude Sonnet 4.5. DeepSeek-V3.1 is $16.73 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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DeepSeek
DeepSeek-V3.1 was developed as an incremental advancement over DeepSeek-V3, designed to refine the mixture-of-experts architecture with improved training techniques. Built to enhance quality and efficiency while maintaining the open-source philosophy, it represents continued iteration on DeepSeek's flagship model line.
8 months newer
DeepSeek-V3.1
DeepSeek
2025-01-10
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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DeepSeek-V3.1
Input:$0.27
Output:$1.00($16.73 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 4 common benchmarks
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Claude Sonnet 4.5
Average Score:74.4%(+18.9%)
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DeepSeek-V3.1
Average Score:55.5%
Performance comparison across key benchmark categories
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Claude Sonnet 4.5
Coding77.2%(+11.2%)
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DeepSeek-V3.1
Coding66.0%
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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:74.4%(+18.9%)
Providers:2
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DeepSeek-V3.1
Avg Score:55.5%
Providers:2