# Claude Opus 5 vs GPT-5.1

As of Oct 15, 2026, Claude Opus 5 leads GPT-5.1 in 7 of 7 shared categories: General LLM, Reasoning, Science, Coding › Web dev, Long context, Factuality, and Abstraction (ARC).

Claude Opus 5: $10 per 1M blended tokens.

GPT-5.1: $3.4375000000000004 per 1M blended tokens.

Claude Opus 5: closed weights.

GPT-5.1: closed weights.

- Which to pick, General LLM: As of Oct 15, 2026, Claude Opus 5 leads GPT-5.1 in General LLM at #11 against #60.
- Which to pick, Reasoning: As of Oct 15, 2026, Claude Opus 5 leads GPT-5.1 in Reasoning at #9 against #62.
- Which to pick, Science: As of Oct 15, 2026, Claude Opus 5 leads GPT-5.1 in Science at #12 against #48.
- Which to pick, Coding › Web dev: As of Oct 15, 2026, Claude Opus 5 leads GPT-5.1 in Coding › Web dev at #6 against #82.
- Which to pick, Long context: As of Oct 15, 2026, Claude Opus 5 leads GPT-5.1 in Long context at #9 against #66.
- Which to pick, Factuality: As of Oct 15, 2026, Claude Opus 5 leads GPT-5.1 in Factuality at #4 against #42.
- Which to pick, Abstraction (ARC): As of Oct 15, 2026, Claude Opus 5 leads GPT-5.1 in Abstraction (ARC) at #3 against #31.

As of Oct 15, 2026, Claude Opus 5 is near state of the art, rank #4 in Factuality (since Oct 15, 2026; sources LMArena Text factuality; methodology v1.0).

As of Oct 15, 2026, GPT-5.1 is ranked #18 in Math (since Oct 15, 2026; sources Humanity's Last Exam; methodology v1.0).