Claude 3 Haiku vs GPT-5.6 Terra

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

Claude 3 Haiku

Anthropic

AI Mastery Index78.5

LMSYS Arena1180

Technical (MMLU-Pro)75.2%

Cost per 1M Tokens$0.25

GPT-5.6 Terra

OpenAI

AI Mastery Index93.9

LMSYS Arena1470

Technical (MMLU-Pro)93.5%

Cost per 1M Tokens$2.5

Architect's Verdict

When comparing Claude 3 Haiku and GPT-5.6 Terra, GPT-5.6 Terra 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.