Meta Launches Muse Spark 1.3 as Reviews Roll In

Episode 1 · Meta releases Muse Spark 1.3, closing the gap with frontier models (2026-09-03, 44 posts)

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

• Meta Releases Muse Spark 1.3 With Major Gains in Agentic and Coding Performance — alexandr_wang · 2026-09-03
• Muse Spark 1.3 Cuts Tool Calls ~20% and Tokens ~25%, Meta Says — alexandr_wang · 2026-09-03
• Meta's Muse Spark 1.3 Cuts Tool Calls ~20% and Tokens ~25%, Says Alexandr Wang — alexandr_wang · 2026-09-03
• Meta Releases Muse Spark 1.3, Its Strongest Model for Agentic and Coding Tasks — shengjia_zhao · 2026-09-03
• Zuckerberg Confirms Muse Spark 1.3 Launch, Teases Open-Weights Releases — ren_hongyu · 2026-09-03
• Muse Spark 1.3 rolls out with 'biggest jump' on coding and agentic work, open weights teased — shuchaobi · 2026-09-03
• Meta releases Muse Spark 1.3 with ~20% fewer tool calls and ~25% fewer tokens — AIatMeta · 2026-09-03
• Muse Spark 1.3 rolls out in Muse Code and Meta Model API, max reasoning pending — AIatMeta · 2026-09-03
• Meta teases Muse Spark open weights and bigger models ahead — AIatMeta · 2026-09-03
• Meta ships muse spark 1.3 with stronger agentic and coding skills at near-zero cost — rohanpaul_ai · 2026-09-03
• Muse launches Spark 1.3, a proactive agentic model update, third release in three days — bowenc0221 · 2026-09-03
• Meta ships Muse Spark 1.3, its third release in two months, targeting coding and agents — ren_hongyu · 2026-09-03
• Muse Spark ships 1.1 to 1.3 in two months, pushing coding and agent skills — EdwardSun0909 · 2026-09-03
• Meta releases Muse Spark 1.3 with upgraded agentic and coding performance — ns123abc · 2026-09-03
• Meta Ships Muse Spark 1.3, Third Release in Two Months, Pushing Coding and Agents — billyuchenlin · 2026-09-03
• Muse Spark 1.3 Ships With 'Almost Too Cheap to Meter' Pricing; Open Weights Next — bowenc0221 · 2026-09-03
• Meta officially releases Muse Spark 1.3 with major agentic and coding upgrades — alexandr_wang · 2026-09-03
• Meta's Muse Spark 1.3 hits 61-62 on AA Intelligence Index, cheapest per-task at its level — ArtificialAnlys · 2026-09-03
• 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

24 more related posts →

Episode 2 · Meta Releases Muse Spark 1.3 as Its Strongest Model (2026-09-03, 2 posts)

Meta has released Muse Spark 1.3, its strongest model yet, with Alexandr Wang claiming it beats GPT-5.6 Sol on coding. Polymarket traders remain skeptical, giving Meta only a 12% chance of holding the top AI model by year-end.

• Meta releases Muse Spark 1.3, claims it beats OpenAI's GPT-5.6 Sol at coding — Polymarket · 2026-09-03
• Polymarket Gives Meta Just 12% Odds to Lead AI Race by Year-End Despite Muse Spark 1.3 — Polymarket · 2026-09-03

Episode 3 · Meta's Muse Spark Runs 2-Hour Self-Improvement Loops for Under $1, Stunning Scale CEO (2026-09-03, 3 posts)

A user benchmark found Meta's Muse Spark 1.3 Ultra finished a task in about a minute while Fable 5.1 took 70 minutes and $13, and ran 20 self-improvement rounds with 60+ agent operations for under $1 over two hours, stunning Scale AI CEO Alexandr Wang.

• Alexandr Wang Touts Meta Muse Spark 1.3: 1 Minute vs Fable 5.1's 70 Minutes and $13 — alexandr_wang · 2026-09-03
• Meta Muse Spark ran 60+ agent loops in 2 hours for under $1, wowing Scale CEO — alexandr_wang · 2026-09-03
• Meta's Muse Spark ran 20 self-improvement loops with 60+ agent runs in 2 hours for under $1 — TinfoilTricorn · 2026-09-03

Episode 4 · Meta Chief AI Officer Praises muse spark 1.3 Sub-Agent Demo (2026-09-03, 2 posts)

Meta's Chief AI Officer Alexandr Wang shared a developer's hands-on test of muse spark 1.3, calling it "pretty cool." The developer deployed parallel sub-agents that completed the task in about an hour.

• Meta's chief AI officer touts muse spark 1.3 as dev fans out sub-agents to finish task in an hour — alexandr_wang · 2026-09-03
• Meta's chief AI officer touts muse spark 1.3 as dev fans out sub-agents to finish task in an hour — alexandr_wang · 2026-09-03