Muse Spark 1.3 ties Fable 5.1 in 105-bug repo test, Meta joins frontier
PawelHuryn · x · 2026-09-13
The author ran an original harness with raw API on 2 real repos containing 105 planted bugs, asking models to find and fix them. Results: Muse Spark 1.3 (max): 33, Fable 5.1 (high): 33, Grok 4.6 (xhigh): 27, Opus 5 (max): 27, Muse Spark 1.3 (high): 19. Takeaway: "Meta joined the frontier." More effort-level results dropping every 1.5h in the thread.
Related event: Bug Hunt Bench: Muse Spark 1.3 Ties Fable 5.1 for the Top Spot(6 posts)→
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