# Claude Opus 5.5 vs Muse Spark

As of Oct 14, 2026, Claude Opus 5.5 leads Muse Spark in 6 of 6 shared categories: General LLM, Reasoning, Science, Coding › Web dev, Long context, and Factuality.

Claude Opus 5.5: $8.000000000000002 per 1M blended tokens.

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

Claude Opus 5.5: closed weights.

Muse Spark: closed weights.

- Which to pick, General LLM: As of Oct 14, 2026, Claude Opus 5.5 leads Muse Spark in General LLM at #2 against #12.
- Which to pick, Reasoning: As of Oct 14, 2026, Claude Opus 5.5 leads Muse Spark in Reasoning at #1 against #17.
- Which to pick, Science: As of Oct 14, 2026, Claude Opus 5.5 leads Muse Spark in Science at #31 against #37.
- Which to pick, Coding › Web dev: As of Oct 14, 2026, Claude Opus 5.5 leads Muse Spark in Coding › Web dev at #1 against #8.
- Which to pick, Long context: As of Oct 14, 2026, Claude Opus 5.5 leads Muse Spark in Long context at #1 against #38.
- Which to pick, Factuality: As of Oct 14, 2026, Claude Opus 5.5 leads Muse Spark in Factuality at #1 against #23.

As of Oct 14, 2026, Claude Opus 5.5 is tied for state of the art in Reasoning (since Oct 2, 2026; sources LMArena Text (style-controlled, hard prompts); methodology v1.0).

As of Oct 14, 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).