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Side by side on the same independent tests, with price and context. The link in your address bar shares this exact comparison.

GPT-6 AstraMuse Spark 1.3

Next to GPT-6 Astra

Presets

GPT-6 Astra

197186–208

WeightsClosed

ReleasedSep 2026

Price in / out$10 / $50

Context1.05M

Core tests taken5 of 8

Muse Spark 1.3

170159–182

WeightsClosed

ReleasedSep 2026

Price in / out$1.25 / $4.25

Context1.05M

Core tests taken2 of 8

GPT-6 Astra leads Muse Spark 1.3 by 27 points, ahead on 2 of 2 shared core tests, at 10× the price.

Test by testindependent results · Epoch AI

GPT-6 AstraMuse Spark 1.3

Only tests that at least two of these models have taken. Bold rows are the core tests shown on every profile; all of these results inform the index score. Task length (METR) is listed below the chart because it is a duration, not a percentage.