# Claude Opus 5.5 vs DeepSeek V3

As of Oct 14, 2026, Claude Opus 5.5 leads DeepSeek V3 in 3 of 3 shared categories: General LLM, Science, and Long context.

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

DeepSeek V3: price per 1M tokens is unset in the catalog.

Claude Opus 5.5: closed weights.

DeepSeek V3: open weights.

- Which to pick, General LLM: As of Oct 14, 2026, Claude Opus 5.5 leads DeepSeek V3 in General LLM at #2 against #11.
- Which to pick, Science: As of Oct 14, 2026, Claude Opus 5.5 leads DeepSeek V3 in Science at #31 against #114.
- Which to pick, Long context: As of Oct 14, 2026, Claude Opus 5.5 leads DeepSeek V3 in Long context at #1 against #144.

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 V3 is a former state-of-the-art holder in General LLM (since Jan 5, 2025; sources LMArena Text (style-controlled, overall); methodology v1.0).