# Claude Opus 4.1 vs Claude Opus 5.5

As of Oct 15, 2026, Claude Opus 4.1 leads Claude Opus 5.5 in 0 of 6 shared categories.

Claude Opus 4.1: $29.999999999999996 per 1M blended tokens.

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

Claude Opus 4.1: 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 4.1 in General LLM at #2 against #73.
- Which to pick, Reasoning: As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 4.1 in Reasoning at #1 against #60.
- Which to pick, Science: As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 4.1 in Science at #31 against #83.
- Which to pick, Coding › Web dev: As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 4.1 in Coding › Web dev at #1 against #84.
- Which to pick, Long context: As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 4.1 in Long context at #1 against #52.
- Which to pick, Factuality: As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 4.1 in Factuality at #1 against #93.

As of Oct 15, 2026, Claude Opus 4.1 is a former state-of-the-art holder in General LLM (since Aug 18, 2025; sources LMArena Text (style-controlled, overall); 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).