# GPT-5.4 vs GPT-5.6 Terra

As of Oct 15, 2026, GPT-5.4 leads GPT-5.6 Terra in 4 of 7 shared categories: General LLM, Reasoning, Long context, and Factuality.

GPT-5.4: $5.625 per 1M blended tokens.

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

GPT-5.4: closed weights.

GPT-5.6 Terra: closed weights.

- Which to pick, General LLM: As of Oct 15, 2026, GPT-5.4 leads GPT-5.6 Terra in General LLM at #28 against #35.
- Which to pick, Reasoning: As of Oct 15, 2026, GPT-5.4 leads GPT-5.6 Terra in Reasoning at #29 against #35.
- Which to pick, Science: As of Oct 15, 2026, GPT-5.6 Terra leads GPT-5.4 in Science at #15 against #16.
- Which to pick, Coding › Web dev: As of Oct 15, 2026, GPT-5.6 Terra leads GPT-5.4 in Coding › Web dev at #42 against #55.
- Which to pick, Long context: As of Oct 15, 2026, GPT-5.4 leads GPT-5.6 Terra in Long context at #34 against #46.
- Which to pick, Factuality: As of Oct 15, 2026, GPT-5.4 leads GPT-5.6 Terra in Factuality at #6 against #24.
- Which to pick, Abstraction (ARC): As of Oct 15, 2026, GPT-5.6 Terra leads GPT-5.4 in Abstraction (ARC) at #4 against #10.

As of Oct 15, 2026, GPT-5.4 is a former state-of-the-art holder in General LLM (since Apr 10, 2026; sources LMArena Text (style-controlled, overall); methodology v1.0).

As of Oct 15, 2026, GPT-5.6 Terra is ranked #4 in Abstraction (ARC) (since Oct 15, 2026; sources ARC-AGI; methodology v1.0).