# Claude Opus 4.6 vs DeepSeek V4.1 Flash

As of Oct 15, 2026, Claude Opus 4.6 leads DeepSeek V4.1 Flash in 5 of 6 shared categories: General LLM, Reasoning, Science, Long context, and Factuality.

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

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

Claude Opus 4.6: closed weights.

DeepSeek V4.1 Flash: open weights.

- Which to pick, General LLM: As of Oct 15, 2026, Claude Opus 4.6 leads DeepSeek V4.1 Flash in General LLM at #4 against #32.
- Which to pick, Reasoning: As of Oct 15, 2026, Claude Opus 4.6 leads DeepSeek V4.1 Flash in Reasoning at #2 against #29.
- Which to pick, Science: As of Oct 15, 2026, Claude Opus 4.6 leads DeepSeek V4.1 Flash in Science at #32 against #36.
- Which to pick, Coding › Web dev: As of Oct 15, 2026, DeepSeek V4.1 Flash leads Claude Opus 4.6 in Coding › Web dev at #21 against #37.
- Which to pick, Long context: As of Oct 15, 2026, Claude Opus 4.6 leads DeepSeek V4.1 Flash in Long context at #2 against #37.
- Which to pick, Factuality: As of Oct 15, 2026, Claude Opus 4.6 leads DeepSeek V4.1 Flash in Factuality at #3 against #25.

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, 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).