Model Comparison
Claude 3.5 Sonnet vs DeepSeek-R1-0528Which is better in 2026?
DeepSeek-R1-0528 shows notably better performance in the majority of benchmarks. DeepSeek-R1-0528 is 6.6x cheaper per token.
Verdict: Claude 3.5 Sonnet vs DeepSeek-R1-0528 — which is better?
Claude 3.5 Sonnet (by Anthropic) and DeepSeek-R1-0528 (by DeepSeek) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.
Claude 3.5 Sonnet outperforms in 1 benchmarks (SWE-Bench Verified), while DeepSeek-R1-0528 is better at 2 benchmarks (GPQA, MMLU-Pro). DeepSeek-R1-0528 shows notably better performance in the majority of benchmarks.
On price, DeepSeek-R1-0528 is roughly 6.6x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Claude 3.5 Sonnet also accepts a larger context window (200,000 input tokens), making it the stronger choice for long documents and large codebases.
Choose Claude 3.5 Sonnet if…
- you process long inputs — it offers a 200,000 token context window
Choose DeepSeek-R1-0528 if…
- you want the strongest raw capability — it leads on 2 of 3 shared benchmarks
- cost matters — it's about 6.6x cheaper per token
- you want the most recent training data — it shipped May 2025
- you need open weights you can self-host or fine-tune
Performance Benchmarks
Comparative analysis across standard metrics
Claude 3.5 Sonnet outperforms in 1 benchmarks (SWE-Bench Verified), while DeepSeek-R1-0528 is better at 2 benchmarks (GPQA, MMLU-Pro).
DeepSeek-R1-0528 shows notably better performance in the majority of benchmarks.
Arena Performance
Human preference votes
Pricing Analysis
Price comparison per million tokens
For input processing, Claude 3.5 Sonnet ($3.00/1M tokens) is 6.0x more expensive than DeepSeek-R1-0528 ($0.50/1M tokens).
For output processing, Claude 3.5 Sonnet ($15.00/1M tokens) is 7.0x more expensive than DeepSeek-R1-0528 ($2.15/1M tokens).
In conclusion, Claude 3.5 Sonnet is more expensive than DeepSeek-R1-0528.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Claude 3.5 Sonnet accepts 200,000 input tokens compared to DeepSeek-R1-0528's 131,072 tokens. Claude 3.5 Sonnet can generate longer responses up to 200,000 tokens, while DeepSeek-R1-0528 is limited to 131,072 tokens.
Input Capabilities
Supported data types and modalities
Claude 3.5 Sonnet supports multimodal inputs, whereas DeepSeek-R1-0528 does not.
Claude 3.5 Sonnet can handle both text and other forms of data like images, making it suitable for multimodal applications.
Claude 3.5 Sonnet
DeepSeek-R1-0528
License
Usage and distribution terms
Claude 3.5 Sonnet is licensed under a proprietary license, while DeepSeek-R1-0528 uses MIT.
License differences may affect how you can use these models in commercial or open-source projects.
Proprietary
Closed source
MIT
Open weights
Release Timeline
When each model was launched
Claude 3.5 Sonnet was released on 2024-10-22, while DeepSeek-R1-0528 was released on 2025-05-28.
DeepSeek-R1-0528 is 7 months newer than Claude 3.5 Sonnet.
Oct 22, 2024
1.7 years ago
May 28, 2025
1.1 years ago
7mo newerKnowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
Claude 3.5 Sonnet is available from Anthropic, Bedrock, Google. DeepSeek-R1-0528 is available from DeepInfra, DeepSeek, Novita.
Claude 3.5 Sonnet
DeepSeek-R1-0528
Outputs Comparison
Key Takeaways
Claude 3.5 Sonnet
View detailsAnthropic
DeepSeek-R1-0528
View detailsDeepSeek
Detailed Comparison
Interactive Arena
Judge for yourself.
Run your own prompts against Claude 3.5 Sonnet and DeepSeek-R1-0528 side-by-side, then vote on the output you prefer.
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FAQ
Common questions about Claude 3.5 Sonnet vs DeepSeek-R1-0528.