# GPT-5.5 vs GPT-5.6 Sol

As of Oct 15, 2026, GPT-5.5 leads GPT-5.6 Sol in 1 of 8 shared categories: Factuality.

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

GPT-5.6 Sol: $8.000000000000002 per 1M blended tokens.

GPT-5.5: closed weights.

GPT-5.6 Sol: closed weights.

- Which to pick, General LLM: As of Oct 15, 2026, GPT-5.6 Sol leads GPT-5.5 in General LLM at #17 against #22.
- Which to pick, Reasoning: As of Oct 15, 2026, GPT-5.6 Sol leads GPT-5.5 in Reasoning at #12 against #26.
- Which to pick, Science: As of Oct 15, 2026, GPT-5.6 Sol leads GPT-5.5 in Science at #13 against #30.
- Which to pick, Coding › Web dev: As of Oct 15, 2026, GPT-5.6 Sol leads GPT-5.5 in Coding › Web dev at #23 against #48.
- Which to pick, Long context: As of Oct 15, 2026, GPT-5.6 Sol leads GPT-5.5 in Long context at #13 against #26.
- Which to pick, Vision: As of Oct 15, 2026, GPT-5.6 Sol leads GPT-5.5 in Vision at #3 against #10.
- Which to pick, Factuality: As of Oct 15, 2026, GPT-5.5 leads GPT-5.6 Sol in Factuality at #5 against #15.
- Which to pick, Abstraction (ARC): As of Oct 15, 2026, GPT-5.6 Sol leads GPT-5.5 in Abstraction (ARC) at #3 against #7.

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).

As of Oct 15, 2026, GPT-5.6 Sol is near state of the art, rank #3 in Vision (since Oct 15, 2026; sources GDP.pdf; methodology v1.0).