Grok 4.5 vs o1-preview

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

Grok 4.5

xAI

AI Mastery Index93.4

LMSYS Arena1465

Technical (MMLU-Pro)92.8%

Cost per 1M Tokens$2

o1-preview

OpenAI

AI Mastery Index88.5

LMSYS Arena1335

Technical (MMLU-Pro)90.8%

Cost per 1M Tokens$15

Architect's Verdict

When comparing Grok 4.5 and o1-preview, Grok 4.5 edges out in overall capabilities according to the AI Mastery Index. However, for cost-sensitive workloads, Grok 4.5 offers a more economical API at $2 per 1M tokens. Your choice should depend heavily on whether you prioritize raw reasoning (MMLU) or scalable deployment economics.