Meta's Muse Spark 1.3 Hits Intelligence Index 61-62, Leading on Cost Efficiency and Agentic Benchmarks
Meta released its proprietary reasoning model Muse Spark 1.3 on September 3, the fourth iteration in five months. Artificial Analysis has published its eval page: the max version scores 62 on the Intelligence Index and the xhigh version 61, a continued sharp climb from 53 for 1.1 and 57 for 1.2, far above the category median of 17 and ranking near the top among all 636 models. Reddit users conclude Meta is slowly closing the gap with top models like GPT-5.6 Sol.
Confirmed
- Artificial Analysis Intelligence Index: xhigh 61, max 62—on par with GPT-5.6 Sol (max)
- Proprietary reasoning model with a 1M tokens context window
- Pricing stays at $1.25/$4.25 per million tokens; the xhigh version costs just $0.55 per Intelligence Index task, the most cost-efficient model at its intelligence level
- Tau3-Bench Banking: max scores 52%, a new first place on that benchmark; xhigh hits 47%, comparable to Claude Fable 5.1 (max) and peers
- Gains over 1.2 concentrate in agentic evals, with a marked jump on GDPval-AA v2
Why it matters
- Four releases in five months plus consecutive Intelligence Index jumps show Meta rapidly closing the gap with frontier models
- Lowest task cost at its intelligence tier is directly attractive for usage-based Agent applications
- Agent-focused evals (GDPval-AA v2, Tau3-Bench Banking) drove most of the gains, showing the iteration is aimed squarely at agentic capability
2026-09-03 ~ 2026-09-03 · 6 related posts
- Episode 1: Meta Launches Muse Spark 1.3 with Agentic and Coding Gains(2026-09-03, 22 posts)
- Episode 2: Meta's Muse Spark 1.3 Hits Intelligence Index 61-62, Leading on Cost Efficiency and Agentic Benchmarks(2026-09-03, 6 posts)
Primary sources
- Meta's Muse Spark 1.3 (max) scores 62 on Artificial Analysis Intelligence Index, top-6 of 636 — ArtificialAnlys ·
- Meta's Muse Spark 1.3 hits 61-62 on AA Intelligence Index, cheapest per-task at its level — ArtificialAnlys ·
- Muse Spark 1.3 (xhigh) is cheapest per-task at its intelligence level at $0.55 — ArtificialAnlys ·
- [source] Meta's Muse Spark 1.3 hits 61-62 on AA Intelligence Index, cheapest per-task at its level — ArtificialAnlys · 2026-09-03
- [source] Muse Spark 1.3 (xhigh) is cheapest per-task at its intelligence level at $0.55 — ArtificialAnlys · 2026-09-03
- Muse Spark 1.3 jumps on Intelligence Index, with agentic evals driving gains at $0.55 per task — ArtificialAnlys · 2026-09-03
- Muse Spark 1.3 (max) takes #1 on Tau3-Bench Banking at 52% — ArtificialAnlys · 2026-09-03
- [source] Meta's Muse Spark 1.3 (max) scores 62 on Artificial Analysis Intelligence Index, top-6 of 636 — ArtificialAnlys · 2026-09-03
- Meta's Muse Spark 1.3 Beats Sol on Artificial Analysis Leaderboard — DistanceSolar1449 · 2026-09-03