Claude 4.7 Opus vs GPT-5.5 Pro

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

Claude 4.7 Opus

Anthropic

AI Mastery Index93.8

LMSYS Arena1345

Technical (MMLU-Pro)93.8%

Cost per 1M Tokens$15

GPT-5.5 Pro

OpenAI

AI Mastery Index94.2

LMSYS Arena1350

Technical (MMLU-Pro)94.2%

Cost per 1M Tokens$30

Architect's Verdict

When comparing Claude 4.7 Opus and GPT-5.5 Pro, GPT-5.5 Pro edges out in overall capabilities according to the AI Mastery Index. However, for cost-sensitive workloads, Claude 4.7 Opus offers a more economical API at $15 per 1M tokens. Your choice should depend heavily on whether you prioritize raw reasoning (MMLU) or scalable deployment economics.