Pairwise benchmark snapshot · Aug 17, 2026
This page compares Claude 3.5 Sonnet (Anthropic) and DeepSeek R1 (DeepSeek) using the latest snapshots we have as of Aug 17, 2026. On preference Elo, DeepSeek R1 is ahead by 78 points (1,358 vs 1,280; lmarena (Aug 17, 2026)). On SWE-bench coding, DeepSeek R1 resolves 65.2% versus 49% (swebench (Aug 17, 2026)). Claude 3.5 Sonnet streams faster (80 tok/s) while DeepSeek R1 is the cheaper output token ($2.5/1M). Claude 3.5 Sonnet has the larger context window (200k tokens). Every cell below is a dated snapshot from a named public source — we do not invent missing scores, and we do not run SWE-bench ourselves.
Anthropic
Claude 3.5 Sonnet2024 workhorse. Still a high-intent compare against GPT-4o.
enable_reasoningReasoning models scale test-time compute by generating hidden chain-of-thought (CoT) tokens. These tokens are billed at standard output rates and directly expand latency (TTFT) in exchange for higher GPQA Diamond and SWE-bench Verified problem resolve rates.
Standard large-scale RL reasoning trace with self-correction.
"enable_reasoning": true
"reasoning": {
"effort": "medium",
"max_tokens": 2800
}Instant pairwise benchmark recalculation across 400+ LLMs
Category wins across intelligence, speed, and pricing efficiency.
Preference Elo, Coding proficiency, SWE-bench & LiveBench accuracy
Generation throughput and time to first token responsiveness
Cost per million tokens and max context window length
Each spoke is a skill. Farther from the center is better (0–100th percentile). Tap any dot to inspect details.
78 pts advantage
18 tok/s faster
$12.50/1M cheaper
Simulate monthly production API costs in USD (US Dollar).
DeepSeek R1 is estimated to save $268.00/month ($3,216/year).
Higher SWE-bench (65.2%).
Lower output list price ($2.5/1M).
Lower TTFT (280 ms).
Larger window (200k).
Claude 3.5 Sonnet is the side marked multimodal in the catalog.
| Target Workload | Recommended Pick | Evaluation Rationale |
|---|---|---|
| Repo / coding agents | DeepSeek R1 | Higher SWE-bench (65.2%). |
| High-volume chat | DeepSeek R1 | Lower output list price ($2.5/1M). |
| Voice / low-latency UI | Claude 3.5 Sonnet | Lower TTFT (280 ms). |
| Long-document RAG | Claude 3.5 Sonnet | Larger window (200k). |
| Screenshots / vision | Claude 3.5 Sonnet | Claude 3.5 Sonnet is the side marked multimodal in the catalog. |
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The real PNG is generated at /compare/claude-3-5-sonnet-vs-deepseek-r1/opengraph-image for crawlers.
Verified head-to-head card