# Claude Opus 5.5 vs GPT-6.1 Sol

As of Oct 15, 2026, Claude Opus 5.5 leads GPT-6.1 Sol in 7 of 10 shared categories: General LLM, Reasoning, Coding, Coding › Agentic, Coding › Web dev, Long context, and Factuality.

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

GPT-6.1 Sol: $4.000000000000001 per 1M blended tokens.

Claude Opus 5.5: closed weights.

GPT-6.1 Sol: closed weights.

- Which to pick, General LLM: As of Oct 15, 2026, Claude Opus 5.5 leads GPT-6.1 Sol in General LLM at #2 against #18.
- Which to pick, Reasoning: As of Oct 15, 2026, Claude Opus 5.5 leads GPT-6.1 Sol in Reasoning at #1 against #15.
- Which to pick, Science: As of Oct 15, 2026, GPT-6.1 Sol leads Claude Opus 5.5 in Science at #4 against #31.
- Which to pick, Coding: As of Oct 15, 2026, Claude Opus 5.5 leads GPT-6.1 Sol in Coding at #1 against #2.
- Which to pick, Coding › Agentic: As of Oct 15, 2026, Claude Opus 5.5 leads GPT-6.1 Sol in Coding › Agentic at #1 against #2.
- Which to pick, Coding › Web dev: As of Oct 15, 2026, Claude Opus 5.5 leads GPT-6.1 Sol in Coding › Web dev at #1 against #4.
- Which to pick, Long context: As of Oct 15, 2026, Claude Opus 5.5 leads GPT-6.1 Sol in Long context at #1 against #18.
- Which to pick, Vision: As of Oct 15, 2026, GPT-6.1 Sol leads Claude Opus 5.5 in Vision at #1 against #4.
- Which to pick, Factuality: As of Oct 15, 2026, Claude Opus 5.5 leads GPT-6.1 Sol in Factuality at #1 against #33.
- Which to pick, Abstraction (ARC): As of Oct 15, 2026, Claude Opus 5.5 and GPT-6.1 Sol share #1 in Abstraction (ARC).

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, GPT-6.1 Sol is tied for state of the art in Vision (since Sep 30, 2026; sources GDP.pdf; methodology v1.0).