# Claude Opus 4.5 20251101 vs Claude Opus 5

As of Oct 14, 2026, Claude Opus 4.5 20251101 leads Claude Opus 5 in 0 of 2 shared categories.

Claude Opus 4.5 20251101: price per 1M tokens is unset in the catalog.

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

Claude Opus 4.5 20251101: closed weights.

Claude Opus 5: closed weights.

- Which to pick, Science: As of Oct 14, 2026, Claude Opus 5 leads Claude Opus 4.5 20251101 in Science at #12 against #55.
- Which to pick, Abstraction (ARC): As of Oct 14, 2026, Claude Opus 5 leads Claude Opus 4.5 20251101 in Abstraction (ARC) at #3 against #27.

As of Oct 14, 2026, Claude Opus 4.5 20251101 is ranked #27 in Abstraction (ARC) (since Oct 14, 2026; sources ARC-AGI; methodology v1.0).

As of Oct 14, 2026, Claude Opus 5 is near state of the art, rank #4 in Factuality (since Oct 14, 2026; sources LMArena Text factuality; methodology v1.0).