# Claude Opus 4.5 vs GPT-5.5

As of Oct 15, 2026, Claude Opus 4.5 leads GPT-5.5 in 1 of 7 shared categories: Long context.

Claude Opus 4.5: $10 per 1M blended tokens.

GPT-5.5: $11.25 per 1M blended tokens.

Claude Opus 4.5: closed weights.

GPT-5.5: closed weights.

- Which to pick, General LLM: As of Oct 15, 2026, GPT-5.5 leads Claude Opus 4.5 in General LLM at #22 against #41.
- Which to pick, Reasoning: As of Oct 15, 2026, GPT-5.5 leads Claude Opus 4.5 in Reasoning at #26 against #30.
- Which to pick, Science: As of Oct 15, 2026, GPT-5.5 leads Claude Opus 4.5 in Science at #30 against #68.
- Which to pick, Coding › Web dev: As of Oct 15, 2026, GPT-5.5 leads Claude Opus 4.5 in Coding › Web dev at #48 against #58.
- Which to pick, Long context: As of Oct 15, 2026, Claude Opus 4.5 leads GPT-5.5 in Long context at #20 against #26.
- Which to pick, Factuality: As of Oct 15, 2026, GPT-5.5 leads Claude Opus 4.5 in Factuality at #5 against #40.
- Which to pick, Abstraction (ARC): As of Oct 15, 2026, GPT-5.5 leads Claude Opus 4.5 in Abstraction (ARC) at #7 against #49.

As of Oct 15, 2026, Claude Opus 4.5 is a former state-of-the-art holder in Reasoning (since Dec 1, 2025; sources LMArena Text (style-controlled, hard prompts); methodology v1.0).

As of Oct 15, 2026, GPT-5.5 is near state of the art, rank #5 in Factuality (since Oct 15, 2026; sources LMArena Text factuality; methodology v1.0).