# GPT-5.4 Pro vs GPT-5.6 Terra

As of Oct 15, 2026, GPT-5.4 Pro leads GPT-5.6 Terra in 1 of 2 shared categories: Science.

GPT-5.4 Pro: $67.5 per 1M blended tokens.

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

GPT-5.4 Pro: closed weights.

GPT-5.6 Terra: closed weights.

- Which to pick, Science: As of Oct 15, 2026, GPT-5.4 Pro leads GPT-5.6 Terra in Science at #6 against #15.
- Which to pick, Abstraction (ARC): As of Oct 15, 2026, GPT-5.6 Terra leads GPT-5.4 Pro in Abstraction (ARC) at #4 against #8.

As of Oct 15, 2026, GPT-5.4 Pro is a former state-of-the-art holder in Math (since Apr 16, 2026; sources Humanity's Last Exam; 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).