# Claude Opus 4 vs Claude Opus 5.5

As of Oct 14, 2026, Claude Opus 4 leads Claude Opus 5.5 in 0 of 5 shared categories.

Claude Opus 4: price per 1M tokens is unset in the catalog.

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

Claude Opus 4: closed weights.

Claude Opus 5.5: closed weights.

- Which to pick, General LLM: As of Oct 14, 2026, Claude Opus 5.5 leads Claude Opus 4 in General LLM at #2 against #102.
- Which to pick, Reasoning: As of Oct 14, 2026, Claude Opus 5.5 leads Claude Opus 4 in Reasoning at #1 against #97.
- Which to pick, Science: As of Oct 14, 2026, Claude Opus 5.5 leads Claude Opus 4 in Science at #31 against #91.
- Which to pick, Long context: As of Oct 14, 2026, Claude Opus 5.5 leads Claude Opus 4 in Long context at #1 against #70.
- Which to pick, Abstraction (ARC): As of Oct 14, 2026, Claude Opus 5.5 leads Claude Opus 4 in Abstraction (ARC) at #1 against #69.

As of Oct 14, 2026, Claude Opus 4 is a former state-of-the-art holder in Reasoning (since Jun 3, 2025; sources LMArena Text (style-controlled, hard prompts); methodology v1.0).

As of Oct 14, 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).