# Claude Sonnet 5.5 vs GPT-5.5

As of Oct 15, 2026, Claude Sonnet 5.5 leads GPT-5.5 in 5 of 7 shared categories: Reasoning, Science, Coding › Web dev, Long context, and Vision.

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

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

Claude Sonnet 5.5: closed weights.

GPT-5.5: closed weights.

- Which to pick, General LLM: As of Oct 15, 2026, GPT-5.5 leads Claude Sonnet 5.5 in General LLM at #22 against #29.
- Which to pick, Reasoning: As of Oct 15, 2026, Claude Sonnet 5.5 leads GPT-5.5 in Reasoning at #18 against #26.
- Which to pick, Science: As of Oct 15, 2026, Claude Sonnet 5.5 leads GPT-5.5 in Science at #3 against #30.
- Which to pick, Coding › Web dev: As of Oct 15, 2026, Claude Sonnet 5.5 leads GPT-5.5 in Coding › Web dev at #3 against #48.
- Which to pick, Long context: As of Oct 15, 2026, Claude Sonnet 5.5 leads GPT-5.5 in Long context at #11 against #26.
- Which to pick, Vision: As of Oct 15, 2026, Claude Sonnet 5.5 leads GPT-5.5 in Vision at #1 against #10.
- Which to pick, Factuality: As of Oct 15, 2026, GPT-5.5 leads Claude Sonnet 5.5 in Factuality at #5 against #17.

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