# Claude 3.5 Sonnet vs Claude Sonnet 5.5

As of Oct 14, 2026, Claude 3.5 Sonnet leads Claude Sonnet 5.5 in 0 of 5 shared categories.

Claude 3.5 Sonnet: price per 1M tokens is unset in the catalog.

Claude Sonnet 5.5: $4.000000000000001 per 1M blended tokens.

Claude 3.5 Sonnet: closed weights.

Claude Sonnet 5.5: closed weights.

- Which to pick, General LLM: As of Oct 14, 2026, Claude Sonnet 5.5 leads Claude 3.5 Sonnet in General LLM at #27 against #140.
- Which to pick, Reasoning: As of Oct 14, 2026, Claude Sonnet 5.5 leads Claude 3.5 Sonnet in Reasoning at #18 against #136.
- Which to pick, Math: As of Oct 14, 2026, Claude Sonnet 5.5 leads Claude 3.5 Sonnet in Math at #4 against #43.
- Which to pick, Science: As of Oct 14, 2026, Claude Sonnet 5.5 leads Claude 3.5 Sonnet in Science at #3 against #119.
- Which to pick, Long context: As of Oct 14, 2026, Claude Sonnet 5.5 leads Claude 3.5 Sonnet in Long context at #11 against #126.

As of Oct 14, 2026, Claude 3.5 Sonnet is a former state-of-the-art holder in General LLM (since Aug 28, 2024; sources LMArena Text (style-controlled, overall); methodology v1.0).

As of Oct 14, 2026, Claude Sonnet 5.5 is tied for state of the art in Coding (since Oct 6, 2026; sources Terminal-Bench 4.0; methodology v1.0).