GPT-5.6 Sol vs Muse Spark 1.3: scores, price and which to pick

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Our take

Muse Spark 1.3 wins 3 of 4 categories and costs less: 4.0× cheaper for everyday text work. Easy pick.

Overall6868

Coding6775Best

Writing6770Best

Support6671Best

Value5462Best

Input / 1M$4.00$1.25Best

Output / 1M$20.00$4.25Best

Blended / 1M$8.00$2.00Best

Context window1.1MBest1M

Open weightsNoNo

Released9 Jul 20262 Sept 2026

Your monthly bill

Tasks per month50k

GPT-5.6 Sol$1.6k

Muse Spark 1.3$400Cheapest

List prices, a quarter of the tokens as output. Scores are provisional, from Arena and Epoch AI.