# GPT-5.5 vs GPT-5.6 Terra

As of Oct 14, 2026, GPT-5.5 leads GPT-5.6 Terra in 5 of 8 shared categories: General LLM, Reasoning, Long context, Vision, and Factuality.

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

GPT-5.6 Terra: $4.5 per 1M blended tokens.

GPT-5.5: closed weights.

GPT-5.6 Terra: closed weights.

- Which to pick, General LLM: As of Oct 14, 2026, GPT-5.5 leads GPT-5.6 Terra in General LLM at #21 against #35.
- Which to pick, Reasoning: As of Oct 14, 2026, GPT-5.5 leads GPT-5.6 Terra in Reasoning at #25 against #35.
- Which to pick, Science: As of Oct 14, 2026, GPT-5.6 Terra leads GPT-5.5 in Science at #15 against #30.
- Which to pick, Coding › Web dev: As of Oct 14, 2026, GPT-5.6 Terra leads GPT-5.5 in Coding › Web dev at #42 against #44.
- Which to pick, Long context: As of Oct 14, 2026, GPT-5.5 leads GPT-5.6 Terra in Long context at #23 against #46.
- Which to pick, Vision: As of Oct 14, 2026, GPT-5.5 leads GPT-5.6 Terra in Vision at #10 against #11.
- Which to pick, Factuality: As of Oct 14, 2026, GPT-5.5 leads GPT-5.6 Terra in Factuality at #5 against #24.
- Which to pick, Abstraction (ARC): As of Oct 14, 2026, GPT-5.6 Terra leads GPT-5.5 in Abstraction (ARC) at #4 against #7.

As of Oct 14, 2026, GPT-5.5 is a former state-of-the-art holder in General LLM (since Apr 28, 2026; sources LMArena Text (style-controlled, overall); methodology v1.0).

As of Oct 14, 2026, GPT-5.6 Terra is ranked #4 in Abstraction (ARC) (since Oct 14, 2026; sources ARC-AGI; methodology v1.0).