Artificial Analysis (@ArtificialAnlys) published Meta Muse Spark 1.3 results on the Coding Agent Index in the Muse Code harness: the publicly available xhigh variant scores 64 (up 2 from Muse Spark 1.2 at 62) at about $1.72 per task—the cheapest agent above a 60 index score—while the partner-preview max variant scores 68, tied just behind Claude Opus 5 (xhigh) in Claude Code. Claude Fable 5.1 results are still pending.

Key Takeaways

  • ✓Muse Spark 1.3 (xhigh) scores 64 on the Coding Agent Index in Muse Code, up 2 from 1.2 (62).
  • ✓About $1.72 per task—cheapest agent above a 60 index score, roughly one-fifth of Claude Opus 5 (xhigh) in Claude Code ($8.17).
  • ✓Partner-preview max variant scores 68, second only to Claude Opus 5 (xhigh); Fable 5.1 results still pending.
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Key Decision Metrics at a Glance

TL;DR Verdict
🏆 Benchmark RankRank
Muse Spark 1.3 (xhigh) scores 64 on the Coding Agent Index in Muse Code, up 2 from 1.2 (62).
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Muse Spark 1.3 · in: $1.25 / out: $4.25
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🛠️ Ecosystem & IDERules
Claude Code (Anthropic)
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Up NextDevin Fusion with an Opus 5.5 lead and GPT-6 Luna sidekick tops the Artificial Analysis Coding Agent Index at 68.1, at what Cognition says is 31% lower cost per task than Claude Code with Opus 5.5
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