Mistral NeMo 12B vs GPT-5.5 Pro

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

Mistral NeMo 12B

Mistral

AI Mastery Index76.5

LMSYS Arena1185

Technical (MMLU-Pro)74.5%

Cost per 1M Tokens$0

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 Mistral NeMo 12B 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, Mistral NeMo 12B offers a more economical API at $0 per 1M tokens. Your choice should depend heavily on whether you prioritize raw reasoning (MMLU) or scalable deployment economics.