Meta launches Muse Spark 1.3, matching Fable 5 at a fraction of the price

Meta officially released Muse Spark 1.3 on 09-03, calling it its biggest capability leap yet in coding and agentic tasks, with the pitch of "frontier performance at a price too cheap to meter." The model is live on Muse Code and the Meta Model API, with the max reasoning tier coming after safety testing is complete; Zuckerberg confirmed the release and teased that the next model and an open-weights version of Muse Spark are coming soon.

Confirmed

• Priced at $0.10 per million input tokens and $0.20 per million output tokens — an ultra-low price roughly one-eighth of Claude Fable 5's pricing (per Alexandr Wang's comparison)
• This is Meta's fourth iteration in five months and its third consecutive upgrade from 1.1 to 1.3 in two months
• On the Artificial Analysis Intelligent Index, the xhigh version scored 61-62, a continued jump from 57 for 1.2 and 53 for 1.1, tying Claude Fable 5 and surpassing GPT-5.6 Sol, Grok 4.6, Kimi K3, and Gemini (per m3, m5); Reddit users also shared screenshots claiming it beats GPT-5.6 Sol
• On Artificial Analysis's Coding Agent Index, the xhigh version sits on the Pareto frontier at $1.72 per task; the max version can't be computed as Meta hasn't published its pricing
• Official improvement data vs 1.2: about 20% fewer tool calls, about 25% fewer tokens consumed, stronger long-horizon tasks and visual coding; supports longer task chains across multiple workflows in a single thread, proactively asks clarifying questions, flags stuck states, and confirms before critical actions
• Third-party benchmarks (per armandruiz): coding capability surpasses GPT-5.6 and Opus 5; ChrisGPT's comparison with Gemini 3.8 Flash claims long-context scores exceed GPT-5.6 (data cited from Google DeepMind, not independently verified)
• aimlapi ran a hands-on 1.3 vs 1.2 comparison using a "Viking figurine" single-file HTML generation task (per alexandrwang)
• Muse Code offers one-line installation: curl -fsSL <url> | bash

Unconfirmed

• m10's benchmark data cited from Google DeepMind is not independently verified; details of m2's leaderboard screenshots haven't been published

Why it matters

• Meta is delivering near-Claude Fable 5 Intelligent Index performance at about one-eighth the price, while occupying the cost-performance Pareto frontier for Coding Agents — direct pressure on frontier-model pricing
• The four-iterations-in-five-months pace shows Meta's momentum in catching up on model capability, and the teased open-weights version further widens its potential impact

2026-09-03 ~ 2026-09-03 · 53 related posts

Full story(4 episodes)→

• Episode 1: Meta launches Muse Spark 1.3, matching Fable 5 at a fraction of the price(2026-09-03, 53 posts)
• Episode 2: Meta Releases Muse Spark 1.3 as Its Strongest Model(2026-09-03, 2 posts)
• Episode 3: Meta's Muse Spark 1.3 Runs 2-Hour Self-Improvement Loop for Under $1(2026-09-03, 4 posts)
• Episode 4: Meta Chief AI Officer Praises muse spark 1.3 Sub-Agent Demo(2026-09-03, 2 posts)

• [source] 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
• 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 Ships Muse Spark 1.3, Third Release in Two Months, Pushing Coding and Agents — billyuchenlin · 2026-09-03
• Meta's Muse Spark 1.3 tops Gemini 3.8 Flash on most overlapping benchmarks, crushes long-context MRCR — ChrisGPT · 2026-09-03
• Muse Spark 1.3 Ships With 'Almost Too Cheap to Meter' Pricing; Open Weights Next — bowenc0221 · 2026-09-03
• [source] 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
• Muse Spark 1.3 (max) takes #1 on Tau3-Bench Banking at 52% — ArtificialAnlys · 2026-09-03
• Meta's Muse Spark 1.3 (max) scores 62 on Artificial Analysis Intelligence Index, top-6 of 636 — ArtificialAnlys · 2026-09-03
• Meta ships Muse Spark 1.3; side-by-side 3D viking figurine test vs 1.2 — alexandr_wang · 2026-09-03
• Meta Releases Muse Spark 1.3, Matching Fable 5 at $0.10/M Input, $0.20/M Output — Public_Umpire_1099 · 2026-09-03
• Meta's Muse Spark 1.3 Beats Sol on Artificial Analysis Leaderboard — DistanceSolar1449 · 2026-09-03
• Muse Spark 1.3 released with focus on instruction following and long-horizon coding — armand_ruiz · 2026-09-03
• Meta ships Muse Spark 1.3, predicts rival model access cutoff and industry-wide token price war — SumitGup · 2026-09-03
• Muse Spark 1.3 ships with better instruction following, fewer agent hallucinations — WenhuChen · 2026-09-03
• Muse Spark 1.3 rolls out with 'biggest jump yet' on coding and agentic work — danshipper · 2026-09-03
• Muse Spark 1.3 ships with an underrated result, one-line curl install for Muse Code — alexandr_wang · 2026-09-03
• Meta's Muse Spark 1.3 ties Claude Fable 5 on Intelligence Index at 8x lower cost — alexandr_wang · 2026-09-03
• Meta CEO Announces Muse Spark 1.3: Biggest Jump Yet in Coding and Agentic Work — acbuller · 2026-09-03
• Meta Releases Muse Spark 1.3: Frontier-Class Intelligence at 1/125th of Claude's Price — alexandr_wang · 2026-09-03
• Scale AI releases muse spark 1.3: frontier-level agentic and coding performance at near-zero cost — shuyanzh36 · 2026-09-03
• Meta ships Muse Spark 1.3, claims biggest coding and agentic jump yet, open weights coming — SumitGup · 2026-09-03
• Muse Spark 1.3 scores 61 on AA Index, Meta's fourth release in five months — Scobleizer · 2026-09-03
• Muse Spark 1.3 (xhigh) hits Pareto frontier at $1.72 per coding task — ArtificialAnlys · 2026-09-03
• Meta's Muse Spark 1.3 scores 68 on coding agent index, near Claude Opus 5 at fraction of cost — ArtificialAnlys · 2026-09-03
• Meta ships Muse Spark 1.3 with big coding and agentic leaps, touts near-meterless pricing — CSProfKGD · 2026-09-03
• Meta's MuseSpark1.3 ties Fable5 on ArtificialAnalysis while cutting token use 25% — 量子位 · 2026-09-03
• Delip Rao: Meta's new pipeline is churning out work fast, Muse Spark 1.3 ships — deliprao · 2026-09-03
• Muse Spark 1.3 Rolls Out With Biggest Coding and Agentic Jump Yet, Open Weights Teased — armand_ruiz · 2026-09-03
• Meta ships MuseSpark 1.3 hours after Google, overtakes Gemini 3.8 Flash on AI index — 智东西 · 2026-09-03
• Meta's Muse Spark 1.3 tops coding benchmarks vs GPT 5.6 and Opus 5, open weights coming — armand_ruiz · 2026-09-03

8 near-duplicate retellings: AIatMeta · ns123abc · alexandr_wang · shuyanzh36 · denny_zhou · LingmingZhang · craighepburn · armand_ruiz