# Claude Opus 4.6 vs DeepSeek V3.1 Terminus Thinking

As of Oct 15, 2026, Claude Opus 4.6 leads DeepSeek V3.1 Terminus Thinking in 3 of 3 shared categories: General LLM, Reasoning, and Long context.

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

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

Claude Opus 4.6: closed weights.

DeepSeek V3.1 Terminus Thinking: open weights.

- Which to pick, General LLM: As of Oct 15, 2026, Claude Opus 4.6 leads DeepSeek V3.1 Terminus Thinking in General LLM at #4 against #126.
- Which to pick, Reasoning: As of Oct 15, 2026, Claude Opus 4.6 leads DeepSeek V3.1 Terminus Thinking in Reasoning at #2 against #113.
- Which to pick, Long context: As of Oct 15, 2026, Claude Opus 4.6 leads DeepSeek V3.1 Terminus Thinking in Long context at #2 against #88.

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 V3.1 Terminus Thinking is ranked #88 in Long context (since Oct 15, 2026; sources LMArena Text (style-controlled, longer query); methodology v1.0).