# Claude Opus 5.5 vs DeepSeek V4 Flash

As of Oct 14, 2026, Claude Opus 5.5 leads DeepSeek V4 Flash in 5 of 5 shared categories: General LLM, Reasoning, Coding › Web dev, Long context, and Factuality.

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

DeepSeek V4 Flash: $0.11374999999999999 per 1M blended tokens.

Claude Opus 5.5: closed weights.

DeepSeek V4 Flash: open weights.

- Which to pick, General LLM: As of Oct 14, 2026, Claude Opus 5.5 leads DeepSeek V4 Flash in General LLM at #2 against #75.
- Which to pick, Reasoning: As of Oct 14, 2026, Claude Opus 5.5 leads DeepSeek V4 Flash in Reasoning at #1 against #72.
- Which to pick, Coding › Web dev: As of Oct 14, 2026, Claude Opus 5.5 leads DeepSeek V4 Flash in Coding › Web dev at #1 against #30.
- Which to pick, Long context: As of Oct 14, 2026, Claude Opus 5.5 leads DeepSeek V4 Flash in Long context at #1 against #69.
- Which to pick, Factuality: As of Oct 14, 2026, Claude Opus 5.5 leads DeepSeek V4 Flash in Factuality at #1 against #66.

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 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).