# Claude Opus 5.5 vs Kimi K2 0905 Preview

As of Oct 15, 2026, Claude Opus 5.5 leads Kimi K2 0905 Preview in 4 of 4 shared categories: General LLM, Reasoning, Long context, and Factuality.

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

Kimi K2 0905 Preview: price per 1M tokens is unset in the catalog.

Claude Opus 5.5: closed weights.

Kimi K2 0905 Preview: open weights.

- Which to pick, General LLM: As of Oct 15, 2026, Claude Opus 5.5 leads Kimi K2 0905 Preview in General LLM at #2 against #120.
- Which to pick, Reasoning: As of Oct 15, 2026, Claude Opus 5.5 leads Kimi K2 0905 Preview in Reasoning at #1 against #122.
- Which to pick, Long context: As of Oct 15, 2026, Claude Opus 5.5 leads Kimi K2 0905 Preview in Long context at #1 against #151.
- Which to pick, Factuality: As of Oct 15, 2026, Claude Opus 5.5 leads Kimi K2 0905 Preview in Factuality at #1 against #140.

As of Oct 15, 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 15, 2026, Kimi K2 0905 Preview is ranked #120 in General LLM (since Oct 15, 2026; sources LMArena Text (style-controlled, overall); methodology v1.0).