# Claude Sonnet 4.5 vs GPT-5.6 Terra

As of Oct 14, 2026, Claude Sonnet 4.5 leads GPT-5.6 Terra in 1 of 7 shared categories: Long context.

Claude Sonnet 4.5: $6 per 1M blended tokens.

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

Claude Sonnet 4.5: closed weights.

GPT-5.6 Terra: closed weights.

- Which to pick, General LLM: As of Oct 14, 2026, GPT-5.6 Terra leads Claude Sonnet 4.5 in General LLM at #35 against #49.
- Which to pick, Reasoning: As of Oct 14, 2026, GPT-5.6 Terra leads Claude Sonnet 4.5 in Reasoning at #35 against #40.
- Which to pick, Science: As of Oct 14, 2026, GPT-5.6 Terra leads Claude Sonnet 4.5 in Science at #15 against #82.
- Which to pick, Coding › Web dev: As of Oct 14, 2026, GPT-5.6 Terra leads Claude Sonnet 4.5 in Coding › Web dev at #42 against #78.
- Which to pick, Long context: As of Oct 14, 2026, Claude Sonnet 4.5 leads GPT-5.6 Terra in Long context at #29 against #46.
- Which to pick, Factuality: As of Oct 14, 2026, GPT-5.6 Terra leads Claude Sonnet 4.5 in Factuality at #24 against #50.
- Which to pick, Abstraction (ARC): As of Oct 14, 2026, GPT-5.6 Terra leads Claude Sonnet 4.5 in Abstraction (ARC) at #4 against #66.

As of Oct 14, 2026, Claude Sonnet 4.5 is a former state-of-the-art holder in General LLM (since Oct 3, 2025; 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).