# Claude Sonnet 5.5 vs GPT-5.1

As of Oct 15, 2026, Claude Sonnet 5.5 leads GPT-5.1 in 7 of 7 shared categories: General LLM, Reasoning, Math, Science, Coding › Web dev, Long context, and Factuality.

Claude Sonnet 5.5: $4.000000000000001 per 1M blended tokens.

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

Claude Sonnet 5.5: closed weights.

GPT-5.1: closed weights.

- Which to pick, General LLM: As of Oct 15, 2026, Claude Sonnet 5.5 leads GPT-5.1 in General LLM at #29 against #60.
- Which to pick, Reasoning: As of Oct 15, 2026, Claude Sonnet 5.5 leads GPT-5.1 in Reasoning at #18 against #62.
- Which to pick, Math: As of Oct 15, 2026, Claude Sonnet 5.5 leads GPT-5.1 in Math at #4 against #18.
- Which to pick, Science: As of Oct 15, 2026, Claude Sonnet 5.5 leads GPT-5.1 in Science at #3 against #48.
- Which to pick, Coding › Web dev: As of Oct 15, 2026, Claude Sonnet 5.5 leads GPT-5.1 in Coding › Web dev at #3 against #82.
- Which to pick, Long context: As of Oct 15, 2026, Claude Sonnet 5.5 leads GPT-5.1 in Long context at #11 against #66.
- Which to pick, Factuality: As of Oct 15, 2026, Claude Sonnet 5.5 leads GPT-5.1 in Factuality at #17 against #42.

As of Oct 15, 2026, Claude Sonnet 5.5 is tied for state of the art in Coding (since Oct 6, 2026; sources Terminal-Bench 4.0; 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).