GPT-5.5 Pro vs Muse Spark 1.1
Head-to-head technical comparison of intelligence, capabilities, and API pricing.
GPT-5.5 Pro
OpenAI
AI Mastery Index94.2
LMSYS Arena1468
Technical (MMLU-Pro)94.2%
Cost per 1M Tokens$30
Muse Spark 1.1
Meta
AI Mastery Index92.3
LMSYS Arena1458
Technical (MMLU-Pro)91.9%
Cost per 1M Tokens$1.25
Architect's Verdict
When comparing GPT-5.5 Pro and Muse Spark 1.1, GPT-5.5 Pro edges out in overall capabilities according to the AI Mastery Index. However, for cost-sensitive workloads, Muse Spark 1.1 offers a more economical API at $1.25 per 1M tokens. Your choice should depend heavily on whether you prioritize raw reasoning (MMLU) or scalable deployment economics.