Muse Spark 1.3 (xhigh) is the most cost-efficient model at its intelligence level: $0.55 per Intelligence Index task at Meta's unchanged $1.25/$4.25 per 1M token pricing. No model scoring 59 or above costs less per task. The nearest are Gemini 3.8 Flash (high, 59, $0.58), GPT-5.6 Sol (xhigh, 59, $0.63) and GLM-5.3 (max, 60, $0.68), while its direct peers at 61 cost far more: Grok 4.6 (high, $0.94), GPT-5.6 Sol (max, $0.95) and Claude Opus 5 (high, $1.23). Muse Spark 1.3 (max) is excluded from cost comparisons as Meta has not announced pricing for the limited release