# Claude Opus 5 vs Claude Sonnet 4.5

As of Oct 14, 2026, Claude Opus 5 leads Claude Sonnet 4.5 in 7 of 7 shared categories: General LLM, Reasoning, Science, Coding › Web dev, Long context, Factuality, and Abstraction (ARC).

Claude Opus 5: $10 per 1M blended tokens.

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

Claude Opus 5: closed weights.

Claude Sonnet 4.5: closed weights.

- Which to pick, General LLM: As of Oct 14, 2026, Claude Opus 5 leads Claude Sonnet 4.5 in General LLM at #11 against #49.
- Which to pick, Reasoning: As of Oct 14, 2026, Claude Opus 5 leads Claude Sonnet 4.5 in Reasoning at #9 against #40.
- Which to pick, Science: As of Oct 14, 2026, Claude Opus 5 leads Claude Sonnet 4.5 in Science at #12 against #82.
- Which to pick, Coding › Web dev: As of Oct 14, 2026, Claude Opus 5 leads Claude Sonnet 4.5 in Coding › Web dev at #6 against #78.
- Which to pick, Long context: As of Oct 14, 2026, Claude Opus 5 leads Claude Sonnet 4.5 in Long context at #9 against #29.
- Which to pick, Factuality: As of Oct 14, 2026, Claude Opus 5 leads Claude Sonnet 4.5 in Factuality at #4 against #50.
- Which to pick, Abstraction (ARC): As of Oct 14, 2026, Claude Opus 5 leads Claude Sonnet 4.5 in Abstraction (ARC) at #3 against #66.

As of Oct 14, 2026, Claude Opus 5 is near state of the art, rank #4 in Factuality (since Oct 14, 2026; sources LMArena Text factuality; methodology v1.0).

As of Oct 14, 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).