Claude Sonnet 4.5 vs DeepSeek R1
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Claude Sonnet 4.5 by Anthropic wins on 12 of 18 benchmarks against DeepSeek R1 by DeepSeek, which leads on 6. This head-to-head comparison covers coding, math, reasoning, speed, and pricing metrics from our benchmark data.
Category-by-Category Breakdown
General Intelligence: In general intelligence, Claude Sonnet 4.5 scores 1380 on Chatbot Arena ELO compared to DeepSeek R1's 1355, while DeepSeek R1 scores 84.0% on MMLU-Pro compared to Claude Sonnet 4.5's 83.0%, while Claude Sonnet 4.5 scores 88.0% on IFEval compared to DeepSeek R1's 87.8%, while Claude Sonnet 4.5 scores 21.2 on AA Intelligence Index compared to DeepSeek R1's 11.4.
Coding: In coding, Claude Sonnet 4.5 scores 90.0% on HumanEval+ compared to DeepSeek R1's 86.0%, while Claude Sonnet 4.5 scores 77.2% on SWE-bench Verified compared to DeepSeek R1's 49.2%, while Claude Sonnet 4.5 scores 62.0% on LiveCodeBench compared to DeepSeek R1's 50.0%, while Claude Sonnet 4.5 scores 52.1 on AA Coding Index compared to DeepSeek R1's 24.6.
Math: In math, DeepSeek R1 scores 97.3% on MATH compared to Claude Sonnet 4.5's 87.0%, while DeepSeek R1 scores 97.0% on GSM8K compared to Claude Sonnet 4.5's 95.5%.
Reasoning: In reasoning, Claude Sonnet 4.5 scores 83.4% on GPQA Diamond compared to DeepSeek R1's 71.5%, while Claude Sonnet 4.5 scores 45.0% on ARC-AGI compared to DeepSeek R1's 14.0%, while Claude Sonnet 4.5 scores 17.5 on AA Agentic Index compared to DeepSeek R1's 1.1.
Context: In context, Claude Sonnet 4.5 scores 1.0M on Context Length compared to DeepSeek R1's 64K.
Pricing Comparison
Claude Sonnet 4.5 costs $3.0/1M input tokens and $15.0/1M output tokens, while DeepSeek R1 costs $0.70/1M input and $2.5/1M output. DeepSeek R1 is the more affordable option for API usage.
Speed Comparison
Claude Sonnet 4.5 generates output at 67 tok/s compared to DeepSeek R1's 35 tok/s, and the time to first token is 1170 ms for Claude Sonnet 4.5 versus 950 ms for DeepSeek R1. Claude Sonnet 4.5 delivers faster throughput.
Verdict
For developers prioritizing coding and general intelligence and speed, Claude Sonnet 4.5 has the edge. For those who value math and affordability, DeepSeek R1 is the stronger choice.
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Claude Sonnet 4.5 vs DeepSeek R1 — FAQ
Which is better, Claude Sonnet 4.5 or DeepSeek R1?
Claude Sonnet 4.5 wins on more benchmarks overall (12 vs 6). However, the best choice depends on your specific needs — each model excels in different areas.
How does Claude Sonnet 4.5 compare to DeepSeek R1 for coding?
Claude Sonnet 4.5 is better for coding, scoring 77.2% on SWE-bench Verified compared to 49.2%. SWE-bench tests real-world software engineering by resolving actual GitHub issues.
Is Claude Sonnet 4.5 cheaper than DeepSeek R1?
Yes, DeepSeek R1 is cheaper. Claude Sonnet 4.5 costs $3.0/1M input and $15.0/1M output tokens. DeepSeek R1 costs $0.70/1M input and $2.5/1M output tokens.
Which is faster, Claude Sonnet 4.5 or DeepSeek R1?
Claude Sonnet 4.5 is faster, generating output at 67 tok/s compared to 35 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the Claude Sonnet 4.5 vs DeepSeek R1 comparison cover?
This comparison covers 18 benchmarks including Chatbot Arena ELO, MMLU-Pro, HumanEval+, IFEval, MATH, GPQA Diamond, SWE-bench Verified, Output Speed, and more. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.