# Claude Sonnet 4.5 vs Muse Spark

As of Oct 15, 2026, Claude Sonnet 4.5 leads Muse Spark in 1 of 7 shared categories: Long context.

Claude Sonnet 4.5: $6 per 1M blended tokens.

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

Claude Sonnet 4.5: closed weights.

Muse Spark: closed weights.

- Which to pick, General LLM: As of Oct 15, 2026, Muse Spark leads Claude Sonnet 4.5 in General LLM at #12 against #49.
- Which to pick, Reasoning: As of Oct 15, 2026, Muse Spark leads Claude Sonnet 4.5 in Reasoning at #17 against #40.
- Which to pick, Math: As of Oct 15, 2026, Muse Spark leads Claude Sonnet 4.5 in Math at #7 against #25.
- Which to pick, Science: As of Oct 15, 2026, Muse Spark leads Claude Sonnet 4.5 in Science at #37 against #82.
- Which to pick, Coding › Web dev: As of Oct 15, 2026, Muse Spark leads Claude Sonnet 4.5 in Coding › Web dev at #8 against #78.
- Which to pick, Long context: As of Oct 15, 2026, Claude Sonnet 4.5 leads Muse Spark in Long context at #29 against #38.
- Which to pick, Factuality: As of Oct 15, 2026, Muse Spark leads Claude Sonnet 4.5 in Factuality at #23 against #50.

As of Oct 15, 2026, Claude Sonnet 4.5 is a former state-of-the-art holder in General LLM (since Oct 3, 2025; sources LMArena Text (style-controlled, overall); 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).