Claude Sonnet 5 vs Claude 3 Haiku

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

Claude 3 Haiku

Anthropic

AI Mastery Index78.5

LMSYS Arena1180

Technical (MMLU-Pro)75.2%

Cost per 1M Tokens$0.25

Architect's Verdict

When comparing Claude Sonnet 5 and Claude 3 Haiku, Claude Sonnet 5 edges out in overall capabilities according to the AI Mastery Index. However, for cost-sensitive workloads, Claude 3 Haiku offers a more economical API at $0.25 per 1M tokens. Your choice should depend heavily on whether you prioritize raw reasoning (MMLU) or scalable deployment economics.