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Claude Sonnet 4.5 vs DeepSeek-V3.1
Comprehensive side-by-side LLM comparison
Claude Sonnet 4.5 leads with 42.6% higher average benchmark score. Claude Sonnet 4.5 offers 128.0K more tokens in context window than DeepSeek-V3.1. DeepSeek-V3.1 is $16.63 cheaper per million tokens. Claude Sonnet 4.5 supports multimodal inputs. Claude Sonnet 4.5 is available on 3 providers. Overall, Claude Sonnet 4.5 is the stronger choice for coding tasks.
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Anthropic
Claude Sonnet 4.5, released by Anthropic in September 2025, is a large language model from the Claude 4.5 family that balances response quality and efficiency for coding, agentic tasks, and analytical work. It features a 200K token context window (extendable to 1M tokens in beta), 64K maximum output tokens, native image understanding, and extended thinking support. Sonnet 4.5 targets use cases that require a balance of throughput and reasoning depth, including code generation, data analysis, and multi-step agentic pipelines.
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DeepSeek
DeepSeek-V3.1, released by DeepSeek in August 2025, is a hybrid large language model with 671 billion total parameters (37 billion active) that unifies the capabilities of DeepSeek-V3 and DeepSeek-R1 in a single model. It features a 128K token context window and supports both direct generation and extended reasoning modes selectable via the chat template. DeepSeek-V3.1 targets general-purpose tasks, coding, and complex reasoning under an open MIT license.
1 month newer
DeepSeek-V3.1
DeepSeek
2025-08-21
Claude Sonnet 4.5
Anthropic
2025-09-29
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:$1.10($16.63 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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Claude Sonnet 4.5
Average Score:43.9%(+42.6%)
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DeepSeek-V3.1
Average Score:1.3%
Performance comparison across key benchmark categories
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Claude Sonnet 4.5
Agents43.9%(+42.6%)
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DeepSeek-V3.1
Agents1.3%
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Knowledge Cutoff
Training data recency comparison
Claude Sonnet 4.5
2025-01
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
3 providers
Anthropic
AWS Bedrock
Google Cloud Vertex AI
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DeepSeek-V3.1
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Claude Sonnet 4.5
Avg Score:43.9%(+42.6%)
Providers:3
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DeepSeek-V3.1
Avg Score:1.3%
Providers:1