# Claude Opus 5.5 vs DeepSeek V4 Flash 0731

As of Oct 14, 2026, Claude Opus 5.5 leads DeepSeek V4 Flash 0731 in 1 of 2 shared categories: Abstraction (ARC).

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

DeepSeek V4 Flash 0731: $0.17200000000000001 per 1M blended tokens.

Claude Opus 5.5: closed weights.

DeepSeek V4 Flash 0731: closed weights.

- Which to pick, Science: As of Oct 14, 2026, DeepSeek V4 Flash 0731 leads Claude Opus 5.5 in Science at #27 against #31.
- Which to pick, Abstraction (ARC): As of Oct 14, 2026, Claude Opus 5.5 leads DeepSeek V4 Flash 0731 in Abstraction (ARC) at #1 against #18.

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).

As of Oct 14, 2026, DeepSeek V4 Flash 0731 is ranked #18 in Abstraction (ARC) (since Oct 14, 2026; sources ARC-AGI; methodology v1.0).