# Claude 3.7 Sonnet vs Claude Opus 5.5

As of Oct 15, 2026, Claude 3.7 Sonnet leads Claude Opus 5.5 in 0 of 5 shared categories.

Claude 3.7 Sonnet: price per 1M tokens is unset in the catalog.

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

Claude 3.7 Sonnet: closed weights.

Claude Opus 5.5: closed weights.

- Which to pick, General LLM: As of Oct 15, 2026, Claude Opus 5.5 leads Claude 3.7 Sonnet in General LLM at #2 against #184.
- Which to pick, Reasoning: As of Oct 15, 2026, Claude Opus 5.5 leads Claude 3.7 Sonnet in Reasoning at #1 against #174.
- Which to pick, Science: As of Oct 15, 2026, Claude Opus 5.5 leads Claude 3.7 Sonnet in Science at #31 against #98.
- Which to pick, Long context: As of Oct 15, 2026, Claude Opus 5.5 leads Claude 3.7 Sonnet in Long context at #1 against #144.
- Which to pick, Abstraction (ARC): As of Oct 15, 2026, Claude Opus 5.5 leads Claude 3.7 Sonnet in Abstraction (ARC) at #1 against #80.

As of Oct 15, 2026, Claude 3.7 Sonnet is a former state-of-the-art holder in Long context (since Mar 11, 2025; sources LMArena Text (style-controlled, longer query); methodology v1.0).

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).