# Claude Opus 5.5 vs Muse Spark 1.2

As of Oct 15, 2026, Claude Opus 5.5 leads Muse Spark 1.2 in 6 of 6 shared categories: General LLM, Reasoning, Coding › Web dev, Long context, Vision, and Factuality.

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

Muse Spark 1.2: $2.0000000000000004 per 1M blended tokens.

Claude Opus 5.5: closed weights.

Muse Spark 1.2: closed weights.

- Which to pick, General LLM: As of Oct 15, 2026, Claude Opus 5.5 leads Muse Spark 1.2 in General LLM at #2 against #8.
- Which to pick, Reasoning: As of Oct 15, 2026, Claude Opus 5.5 leads Muse Spark 1.2 in Reasoning at #1 against #11.
- Which to pick, Coding › Web dev: As of Oct 15, 2026, Claude Opus 5.5 leads Muse Spark 1.2 in Coding › Web dev at #1 against #42.
- Which to pick, Long context: As of Oct 15, 2026, Claude Opus 5.5 leads Muse Spark 1.2 in Long context at #1 against #17.
- Which to pick, Vision: As of Oct 15, 2026, Claude Opus 5.5 leads Muse Spark 1.2 in Vision at #4 against #27.
- Which to pick, Factuality: As of Oct 15, 2026, Claude Opus 5.5 leads Muse Spark 1.2 in Factuality at #1 against #9.

As of Oct 15, 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 15, 2026, Muse Spark 1.2 is a former state-of-the-art holder in General LLM (since Sep 11, 2026; sources LMArena Text (style-controlled, overall); methodology v1.0).