Up to four models

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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-5.6 TerraMuse Spark 1.3

Next to GPT-5.6 Terra

Presets

GPT-5.6 Terra

178167–189

WeightsClosed

ReleasedJul 2026

Price in / out$2.0 / $12

Context1.05M

Core tests taken4 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-5.6 Terra leads Muse Spark 1.3 by 7 points, ahead on 2 of 2 shared core tests, at 2.3× the price.

Test by testindependent results · Epoch AI

GPT-5.6 TerraMuse 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.