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Claude 3.5 Sonnet vs DeepSeek-V3.1
Comprehensive side-by-side LLM comparison
Both models show comparable benchmark performance. Claude 3.5 Sonnet offers 72.1K more tokens in context window than DeepSeek-V3.1. DeepSeek-V3.1 is $16.63 cheaper per million tokens. Claude 3.5 Sonnet supports multimodal inputs. Claude 3.5 Sonnet is available on 3 providers. Both models have their strengths depending on your specific coding needs.
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Anthropic
Claude 3.5 Sonnet, updated by Anthropic in October 2024 (originally released June 2024), is a large language model from the Claude 3.5 family that delivered strong performance in coding, reasoning, and instruction-following at its release. It supports a 200K token context window, 8K maximum output tokens, and native image understanding including screenshot analysis and document comprehension. Claude 3.5 Sonnet targets general-purpose development tasks, document analysis, and applications requiring reliable instruction following with visual input support.
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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.
10 months newer
Claude 3.5 Sonnet
Anthropic
2024-10-22
DeepSeek-V3.1
DeepSeek
2025-08-21
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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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 3.5 Sonnet
Average Score:0.9%
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DeepSeek-V3.1
Average Score:1.3%(+0.4%)
Performance comparison across key benchmark categories
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Claude 3.5 Sonnet
Agents0.9%
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DeepSeek-V3.1
Agents1.3%(+0.4%)
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Knowledge Cutoff
Training data recency comparison
Claude 3.5 Sonnet
2024-04
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
AWS Bedrock
Google Cloud Vertex AI
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DeepSeek-V3.1
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Claude 3.5 Sonnet
Avg Score:0.9%
Providers:3
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DeepSeek-V3.1
Avg Score:1.3%(+0.4%)
Providers:1