GPT-5.6 Sol vs o1-preview

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

GPT-5.6 Sol

OpenAI

AI Mastery Index95.7

LMSYS Arena1485

Technical (MMLU-Pro)95.1%

Cost per 1M Tokens$5

o1-preview

OpenAI

AI Mastery Index88.5

LMSYS Arena1335

Technical (MMLU-Pro)90.8%

Cost per 1M Tokens$15

Architect's Verdict

When comparing GPT-5.6 Sol and o1-preview, GPT-5.6 Sol edges out in overall capabilities according to the AI Mastery Index. However, for cost-sensitive workloads, GPT-5.6 Sol offers a more economical API at $5 per 1M tokens. Your choice should depend heavily on whether you prioritize raw reasoning (MMLU) or scalable deployment economics.