GPT-5.6 Sol vs Command R+

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

Command R+

Cohere

AI Mastery Index81.8

LMSYS Arena1215

Technical (MMLU-Pro)82.3%

Cost per 1M Tokens$3

Architect's Verdict

When comparing GPT-5.6 Sol and Command R+, GPT-5.6 Sol edges out in overall capabilities according to the AI Mastery Index. However, for cost-sensitive workloads, Command R+ offers a more economical API at $3 per 1M tokens. Your choice should depend heavily on whether you prioritize raw reasoning (MMLU) or scalable deployment economics.