# Claude Opus 4.6 vs Claude Opus 5.5

As of Oct 15, 2026, Claude Opus 4.6 leads Claude Opus 5.5 in 0 of 6 shared categories.

Claude Opus 4.6: $10 per 1M blended tokens.

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

Claude Opus 4.6: 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 4.6 in General LLM at #2 against #4.
- Which to pick, Reasoning: As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 4.6 in Reasoning at #1 against #2.
- Which to pick, Science: As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 4.6 in Science at #31 against #32.
- Which to pick, Coding › Web dev: As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 4.6 in Coding › Web dev at #1 against #35.
- Which to pick, Long context: As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 4.6 in Long context at #1 against #2.
- Which to pick, Factuality: As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 4.6 in Factuality at #1 against #3.

As of Oct 15, 2026, Claude Opus 4.6 is near state of the art, rank #2 in Reasoning (since Oct 15, 2026; sources LMArena Text (style-controlled, hard prompts); 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).