Compare · updated 2026-11-01

GPT-5.5 vs Muse Spark

GPT-5.5 is better at quick answers, writing, coding, maths, structured data, long documents, translation; Muse Spark is better at reasoning. Muse Spark is the cheaper of the two on output.

Measured quality by task

Quality is Nivana’s measured score for each kind of task, from weekly pairwise evals judged by models from several labs. Prices are live AI Gateway list prices per million tokens. Updated 2026-11-01. How this is measured.

Price and context

Which should you use?

Use the one that wins the kind of work you do most, unless the price gap outweighs the quality gap for easy requests. Or don’t choose: Nivana scores both, and the rest of the pool, on every request and sends it to whichever is best for that request.

Questions

Is GPT-5.5 better than Muse Spark?

On Nivana’s weekly evals GPT-5.5 scores higher on 7 of 8 task types (quick answers, writing, coding, maths, structured data, long documents, translation) and Muse Spark on 1 (reasoning). Neither is better at everything.

Which is better for coding, GPT-5.5 or Muse Spark?

GPT-5.5: 91/100 against 84/100 for Muse Spark on Nivana’s coding evals.

Which is better for writing, GPT-5.5 or Muse Spark?

GPT-5.5: 94/100 against 86/100 for Muse Spark on Nivana’s writing evals.

Which is cheaper, GPT-5.5 or Muse Spark?

Muse Spark: $4.25 per million output tokens against $30 for GPT-5.5, about 7.1× less. A typical chat answer costs about $0.0049 on Muse Spark and $0.029 on GPT-5.5.