# Claude Opus 5.5 vs DeepSeek V4 Pro

As of Oct 14, 2026, Claude Opus 5.5 leads DeepSeek V4 Pro in 5 of 6 shared categories: General LLM, Reasoning, Coding › Web dev, Long context, and Factuality.

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

DeepSeek V4 Pro: $0.4478325 per 1M blended tokens.

Claude Opus 5.5: closed weights.

DeepSeek V4 Pro: open weights.

- Which to pick, General LLM: As of Oct 14, 2026, Claude Opus 5.5 leads DeepSeek V4 Pro in General LLM at #2 against #44.
- Which to pick, Reasoning: As of Oct 14, 2026, Claude Opus 5.5 leads DeepSeek V4 Pro in Reasoning at #1 against #45.
- Which to pick, Science: As of Oct 14, 2026, DeepSeek V4 Pro leads Claude Opus 5.5 in Science at #28 against #31.
- Which to pick, Coding › Web dev: As of Oct 14, 2026, Claude Opus 5.5 leads DeepSeek V4 Pro in Coding › Web dev at #1 against #57.
- Which to pick, Long context: As of Oct 14, 2026, Claude Opus 5.5 leads DeepSeek V4 Pro in Long context at #1 against #43.
- Which to pick, Factuality: As of Oct 14, 2026, Claude Opus 5.5 leads DeepSeek V4 Pro in Factuality at #1 against #41.

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 Pro is ranked #28 in Science (since Oct 14, 2026; sources GPQA Diamond; methodology v1.0).