Claude Sonnet 5 vs DeepSeek-V4 Pro

Head-to-head technical comparison of intelligence, capabilities, and API pricing.

Claude Sonnet 5

Anthropic

AI Mastery Index94.8

LMSYS Arena1472

Technical (MMLU-Pro)94.6%

Cost per 1M Tokens$2

DeepSeek-V4 Pro

DeepSeek

AI Mastery Index91.8

LMSYS Arena1449

Technical (MMLU-Pro)91.8%

Cost per 1M Tokens$1.32

Architect's Verdict

When comparing Claude Sonnet 5 and DeepSeek-V4 Pro, Claude Sonnet 5 edges out in overall capabilities according to the AI Mastery Index. However, for cost-sensitive workloads, DeepSeek-V4 Pro offers a more economical API at $1.32 per 1M tokens. Your choice should depend heavily on whether you prioritize raw reasoning (MMLU) or scalable deployment economics.