Muse Spark 1.3 changelog

Every change to Muse Spark 1.3 that Modelpeers has recorded, newest first, each with the source it came from. The record starts Sep 2, 2026.

All (5)Releases (2)Benchmarks (3)

October 2026

Muse Spark 1.3

Model at Meta

Benchmark1w

Arena October 22 snapshot: Muse Spark 1.3 (Max) 10th on text and 15th on WebDev

Arena's October 22, 2026 text leaderboard ranks Muse Spark 1.3 (Max) 10th at 1491 with 20,506 votes, ahead of Muse Spark 1.2 (xHigh) at 17th. The WebDev leaderboard of the same date ranks Muse Spark 1.3 (Max) 15th at 1657 and Muse Spark 1.3 (xHigh) 25th at 1620.

Muse Spark 1.3

Model at Meta

Benchmark1w

Vals AI Terminal-Bench 4.0: Muse Spark 1.3 Max at 24.8%, 24th

Running every model in the same Mini-SWE-agent harness, Vals AI lists Muse Spark 1.3 Max 24th on Terminal-Bench 4.0 at 24.75% for $6.65 per test, and its separately listed Muse Spark 1.3 entry 40th at 10.61%. On Vals AI's ProofBench, Muse Spark 1.3 Max scores 58.00% and Muse Spark 1.3 55.00%.

September 2026

Muse Spark 1.3

Model at Meta

BenchmarkSep 18, 2026

Epoch: Muse Spark 1.3 (max) scores 74% on FrontierMath tiers 1-3 and 46% on tier 4

Epoch benchmark data records Muse Spark 1.3 at max effort at 74.04% on FrontierMath tiers 1-3 and 46.34% on tier 4, from runs started September 18, 2026. Runs at xhigh effort, started September 16, scored 74.39% and 41.46%. Epoch's Capabilities Index lists Muse Spark 1.3 at 157.21 and Muse Spark 1.2 at 155.05.

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