# Claude Opus 5 vs Claude Opus 5.5

As of Oct 15, 2026, Claude Opus 5 leads Claude Opus 5.5 in 1 of 10 shared categories: Science.

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

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

Claude Opus 5: closed weights.

Claude Opus 5.5: closed weights.

- Which to pick, General LLM: As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 5 in General LLM at #2 against #11.
- Which to pick, Reasoning: As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 5 in Reasoning at #1 against #9.
- Which to pick, Science: As of Oct 15, 2026, Claude Opus 5 leads Claude Opus 5.5 in Science at #12 against #31.
- Which to pick, Coding: As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 5 in Coding at #1 against #4.
- Which to pick, Coding › Agentic: As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 5 in Coding › Agentic at #1 against #4.
- Which to pick, Coding › Web dev: As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 5 in Coding › Web dev at #1 against #6.
- Which to pick, Long context: As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 5 in Long context at #1 against #9.
- Which to pick, Vision: As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 5 in Vision at #4 against #12.
- Which to pick, Factuality: As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 5 in Factuality at #1 against #4.
- Which to pick, Abstraction (ARC): As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 5 in Abstraction (ARC) at #1 against #3.

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 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).