Muse Spark 1.3 scores 64 on coding tasks at a fifth of Opus 5's cost per task
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Meta's Muse Spark 1.3 (max), which is in limited preview for Meta's partners, scores 68 on the Artificial Analysis Coding Agent Index in the Muse Code harness, #2 behind only Claude Opus 5 (xhigh) in Claude Code. The variant available now, Muse Spark 1.3 (xhigh), scores 64 and costs the least per task of any agent above a 60 index score Muse Spark 1.3 (xhigh) enters the Artificial Analysis Coding Agent Index at 64 in Muse Code, up 2 points from Muse Spark 1.2 (62, August). It enters level with Grok 4.5 (high) in Grok Build (64) and behind GPT-5.6 Sol (max) in Codex (65). At $1.72 per task, it costs the least of any agent above a 60 index score, around a fifth of the cost of Claude Opus 5 (xhigh) in Claude Code ($8.17) Muse Spark 1.3 (max), which is in a limited preview stage, lands at 68 in Muse Code. It enters behind only Claude Opus 5 (xhigh) in Claude Code (68), and ahead of Claude Fable 5 (max) in Claude Code (67) and GPT-5.6 Sol (max) in Codex (65). Muse Spark 1.3 (max) is excluded from cost comparisons as Meta has not announced pricing for the limited release Claude Fable 5.1 results are in progress and will be added when complete. Congratulations @AIatMeta, @finkd, and @alexandr_wang on this result!
Muse Spark 1.3 (xhigh) in Muse Code sits on the Pareto frontier for Coding Agent Index vs. cost per task at $1.72. Muse Spark 1.3 (max) is excluded from cost comparisons as Meta has not announced pricing for the limited release, but on tokens it averages ~14M total tokens per task, around a third fewer than Claude Opus 5 (xhigh) in Claude Code (~22M) at the same score.
For more details and full results across all coding agent harnesses and models see: https://t.co/huXZWndXsZ
Context
On the Artificial Analysis Coding Agent Index, which scores models inside real agentic coding harnesses rather than isolated prompts, Meta's Muse Spark 1.3 (xhigh) reaches 64 running in Meta's own Muse Code , level with Grok 4.5 (high) in Grok Build and just behind GPT-5.6 Sol (max) in Codex at 65. At $1.72 per task, Artificial Analysis says it is the cheapest scoring above 60 on the index, roughly a fifth of the $8.17 Claude Opus 5 (xhigh) costs in Claude Code for a similar score band.
A second variant, Muse Spark 1.3 (max), remains limited to Meta's partners and has no published pricing. It scores 68 in Muse Code, behind only Claude Opus 5 (xhigh) in Claude Code and ahead of Claude Fable 5 (max) in Claude Code at 67, while averaging about 14 million total per task, roughly a third fewer than Claude Opus 5 (xhigh) uses for a comparable score, according to Artificial Analysis.
- AI agent — An AI system that doesn't just answer once but works toward a goal in a loop — taking actions, reading the results, and deciding what to do next.
- agent harness — The scaffolding around a model that turns it into a working agent — the loop, the tools it can call, and the rules for when to stop.
- token — The chunk of text a model reads and writes in — roughly three-quarters of a word — and the unit AI usage is billed in.
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