# Claude Sonnet 5.5 vs GPT-4.5 Preview

As of Oct 15, 2026, Claude Sonnet 5.5 leads GPT-4.5 Preview in 5 of 5 shared categories: General LLM, Reasoning, Math, Science, and Long context.

Claude Sonnet 5.5: $4.000000000000001 per 1M blended tokens.

GPT-4.5 Preview: price per 1M tokens is unset in the catalog.

Claude Sonnet 5.5: closed weights.

GPT-4.5 Preview: closed weights.

- Which to pick, General LLM: As of Oct 15, 2026, Claude Sonnet 5.5 leads GPT-4.5 Preview in General LLM at #29 against #79.
- Which to pick, Reasoning: As of Oct 15, 2026, Claude Sonnet 5.5 leads GPT-4.5 Preview in Reasoning at #18 against #121.
- Which to pick, Math: As of Oct 15, 2026, Claude Sonnet 5.5 leads GPT-4.5 Preview in Math at #4 against #38.
- Which to pick, Science: As of Oct 15, 2026, Claude Sonnet 5.5 leads GPT-4.5 Preview in Science at #3 against #92.
- Which to pick, Long context: As of Oct 15, 2026, Claude Sonnet 5.5 leads GPT-4.5 Preview in Long context at #11 against #93.

As of Oct 15, 2026, Claude Sonnet 5.5 is tied for state of the art in Coding (since Oct 6, 2026; sources Terminal-Bench 4.0; methodology v1.0).

As of Oct 15, 2026, GPT-4.5 Preview is a former state-of-the-art holder in General LLM (since Oct 17, 2025; sources LMArena Text (style-controlled, overall); methodology v1.0).