# Claude Opus 4.6 vs GPT-5.5

As of Oct 15, 2026, Claude Opus 4.6 leads GPT-5.5 in 5 of 6 shared categories: General LLM, Reasoning, Coding › Web dev, Long context, and Factuality.

Claude Opus 4.6: $10 per 1M blended tokens.

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

Claude Opus 4.6: closed weights.

GPT-5.5: closed weights.

- Which to pick, General LLM: As of Oct 15, 2026, Claude Opus 4.6 leads GPT-5.5 in General LLM at #4 against #22.
- Which to pick, Reasoning: As of Oct 15, 2026, Claude Opus 4.6 leads GPT-5.5 in Reasoning at #2 against #26.
- Which to pick, Science: As of Oct 15, 2026, GPT-5.5 leads Claude Opus 4.6 in Science at #30 against #32.
- Which to pick, Coding › Web dev: As of Oct 15, 2026, Claude Opus 4.6 leads GPT-5.5 in Coding › Web dev at #37 against #48.
- Which to pick, Long context: As of Oct 15, 2026, Claude Opus 4.6 leads GPT-5.5 in Long context at #2 against #26.
- Which to pick, Factuality: As of Oct 15, 2026, Claude Opus 4.6 leads GPT-5.5 in Factuality at #3 against #5.

As of Oct 15, 2026, Claude Opus 4.6 is near state of the art, rank #2 in Reasoning (since Oct 15, 2026; 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).