# Claude Opus 4.5 vs DeepSeek V4.1 Flash

As of Oct 15, 2026, Claude Opus 4.5 leads DeepSeek V4.1 Flash in 1 of 7 shared categories: Long context.

Claude Opus 4.5: $10 per 1M blended tokens.

DeepSeek V4.1 Flash: $0.23463 per 1M blended tokens.

Claude Opus 4.5: closed weights.

DeepSeek V4.1 Flash: open weights.

- Which to pick, General LLM: As of Oct 15, 2026, DeepSeek V4.1 Flash leads Claude Opus 4.5 in General LLM at #32 against #41.
- Which to pick, Reasoning: As of Oct 15, 2026, DeepSeek V4.1 Flash leads Claude Opus 4.5 in Reasoning at #29 against #30.
- Which to pick, Science: As of Oct 15, 2026, DeepSeek V4.1 Flash leads Claude Opus 4.5 in Science at #36 against #68.
- Which to pick, Coding › Web dev: As of Oct 15, 2026, DeepSeek V4.1 Flash leads Claude Opus 4.5 in Coding › Web dev at #21 against #58.
- Which to pick, Long context: As of Oct 15, 2026, Claude Opus 4.5 leads DeepSeek V4.1 Flash in Long context at #20 against #37.
- Which to pick, Factuality: As of Oct 15, 2026, DeepSeek V4.1 Flash leads Claude Opus 4.5 in Factuality at #25 against #40.
- Which to pick, Abstraction (ARC): As of Oct 15, 2026, DeepSeek V4.1 Flash leads Claude Opus 4.5 in Abstraction (ARC) at #8 against #49.

As of Oct 15, 2026, Claude Opus 4.5 is a former state-of-the-art holder in Reasoning (since Dec 1, 2025; sources LMArena Text (style-controlled, hard prompts); methodology v1.0).

As of Oct 15, 2026, DeepSeek V4.1 Flash is state of the art on best per dollar in General LLM (since Oct 14, 2026; sources LMArena Text (style-controlled, overall); methodology v1.0).