Claude Sonnet 5 vs DeepSeek-V4

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

Claude Sonnet 5

Anthropic

AI Mastery Index94

LMSYS Arena1356

Technical (MMLU-Pro)94%

Cost per 1M Tokens$2

DeepSeek-V4

DeepSeek

AI Mastery Index91.8

LMSYS Arena1290

Technical (MMLU-Pro)91.8%

Cost per 1M Tokens$0.14

Architect's Verdict

When comparing Claude Sonnet 5 and DeepSeek-V4, Claude Sonnet 5 edges out in overall capabilities according to the AI Mastery Index. However, for cost-sensitive workloads, DeepSeek-V4 offers a more economical API at $0.14 per 1M tokens. Your choice should depend heavily on whether you prioritize raw reasoning (MMLU) or scalable deployment economics.