# Claude Opus 5.5 vs Mistral Medium 2505

As of Oct 15, 2026, Claude Opus 5.5 leads Mistral Medium 2505 in 4 of 4 shared categories: General LLM, Reasoning, Science, and Long context.

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

Mistral Medium 2505: price per 1M tokens is unset in the catalog.

Claude Opus 5.5: closed weights.

Mistral Medium 2505: closed weights.

- Which to pick, General LLM: As of Oct 15, 2026, Claude Opus 5.5 leads Mistral Medium 2505 in General LLM at #2 against #169.
- Which to pick, Reasoning: As of Oct 15, 2026, Claude Opus 5.5 leads Mistral Medium 2505 in Reasoning at #1 against #173.
- Which to pick, Science: As of Oct 15, 2026, Claude Opus 5.5 leads Mistral Medium 2505 in Science at #31 against #110.
- Which to pick, Long context: As of Oct 15, 2026, Claude Opus 5.5 leads Mistral Medium 2505 in Long context at #1 against #166.

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, Mistral Medium 2505 is ranked #41 in Math (since Oct 15, 2026; sources Humanity's Last Exam; methodology v1.0).