# Claude Opus 5 vs Claude Sonnet 4

As of Oct 15, 2026, Claude Opus 5 leads Claude Sonnet 4 in 5 of 5 shared categories: General LLM, Reasoning, Science, Long context, and Abstraction (ARC).

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

Claude Sonnet 4: $6 per 1M blended tokens.

Claude Opus 5: closed weights.

Claude Sonnet 4: closed weights.

- Which to pick, General LLM: As of Oct 15, 2026, Claude Opus 5 leads Claude Sonnet 4 in General LLM at #11 against #163.
- Which to pick, Reasoning: As of Oct 15, 2026, Claude Opus 5 leads Claude Sonnet 4 in Reasoning at #9 against #149.
- Which to pick, Science: As of Oct 15, 2026, Claude Opus 5 leads Claude Sonnet 4 in Science at #12 against #97.
- Which to pick, Long context: As of Oct 15, 2026, Claude Opus 5 leads Claude Sonnet 4 in Long context at #9 against #123.
- Which to pick, Abstraction (ARC): As of Oct 15, 2026, Claude Opus 5 leads Claude Sonnet 4 in Abstraction (ARC) at #3 against #67.

As of Oct 15, 2026, Claude Opus 5 is near state of the art, rank #4 in Factuality (since Oct 15, 2026; sources LMArena Text factuality; methodology v1.0).

As of Oct 15, 2026, Claude Sonnet 4 is ranked #35 in Math (since Oct 15, 2026; sources Humanity's Last Exam; methodology v1.0).