Meta's Muse Spark 1.3 hits 61-62 on AA Intelligence Index, cheapest per-task at its level
ArtificialAnlys · x · 2026-09-03
Meta released Muse Spark 1.3, its fourth release in five months. The xhigh variant scores 61 on the Artificial Analysis Intelligence Index (up from 57), tying GPT-5.6 Sol (max) and Grok 4.6 (high); the limited-preview max variant scores 62, behind only Claude Fable 5.1 and Claude Opus 5.
- Gains are driven by agentic work: Tau3-Bench Banking 35%→47%/52% (#1), Terminal-Bench 2.1 at 85-86%, GDPval-AA v2 Elo +94/+139.
- xhigh costs $0.55 per Intelligence Index task at unchanged $1.25/$4.25 per 1M token pricing — the cheapest among models scoring 59+, though up from 1.2's $0.40 due to 57% more input tokens.
- Scientific reasoning also rose: CritPt +8 to 26%, GPQA Diamond +4 to 94%.
Related event: Meta Launches Muse Spark 1.3: Near-Frontier Performance at ~1/8 the Price(53 posts)→
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