# Claude Opus 5.5 vs Grok 4.5

As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.5 in 9 of 10 shared categories: General LLM, Reasoning, Coding, Coding › Agentic, Coding › Web dev, Long context, Vision, Factuality, and Abstraction (ARC).

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

Grok 4.5: $3 per 1M blended tokens.

Claude Opus 5.5: closed weights.

Grok 4.5: closed weights.

- Which to pick, General LLM: As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.5 in General LLM at #2 against #45.
- Which to pick, Reasoning: As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.5 in Reasoning at #1 against #44.
- Which to pick, Science: As of Oct 15, 2026, Grok 4.5 leads Claude Opus 5.5 in Science at #14 against #31.
- Which to pick, Coding: As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.5 in Coding at #1 against #19.
- Which to pick, Coding › Agentic: As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.5 in Coding › Agentic at #1 against #19.
- Which to pick, Coding › Web dev: As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.5 in Coding › Web dev at #1 against #36.
- Which to pick, Long context: As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.5 in Long context at #1 against #41.
- Which to pick, Vision: As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.5 in Vision at #4 against #29.
- Which to pick, Factuality: As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.5 in Factuality at #1 against #30.
- Which to pick, Abstraction (ARC): As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.5 in Abstraction (ARC) at #1 against #21.

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, Grok 4.5 is ranked #14 in Science (since Oct 15, 2026; sources GPQA Diamond; methodology v1.0).