# GPT-5.5 vs Muse Spark

As of Oct 15, 2026, GPT-5.5 leads Muse Spark in 3 of 6 shared categories: Science, Long context, and Factuality.

GPT-5.5: $11.25 per 1M blended tokens.

Muse Spark: price per 1M tokens is unset in the catalog.

GPT-5.5: closed weights.

Muse Spark: closed weights.

- Which to pick, General LLM: As of Oct 15, 2026, Muse Spark leads GPT-5.5 in General LLM at #12 against #22.
- Which to pick, Reasoning: As of Oct 15, 2026, Muse Spark leads GPT-5.5 in Reasoning at #17 against #26.
- Which to pick, Science: As of Oct 15, 2026, GPT-5.5 leads Muse Spark in Science at #30 against #37.
- Which to pick, Coding › Web dev: As of Oct 15, 2026, Muse Spark leads GPT-5.5 in Coding › Web dev at #12 against #48.
- Which to pick, Long context: As of Oct 15, 2026, GPT-5.5 leads Muse Spark in Long context at #26 against #44.
- Which to pick, Factuality: As of Oct 15, 2026, GPT-5.5 leads Muse Spark in Factuality at #5 against #27.

As of Oct 15, 2026, GPT-5.5 is near state of the art, rank #5 in Factuality (since Oct 15, 2026; sources LMArena Text factuality; methodology v1.0).

As of Oct 15, 2026, Muse Spark is a former state-of-the-art holder in General LLM (since May 18, 2026; sources LMArena Text (style-controlled, overall); methodology v1.0).